Mitsubishi Electric MELSEC FX Series Owner's manual

Programmable Controllers
Structured Programming Manual
[Basic & Applied Instruction]
FXCPU
MITSUBISHI ELECTRIC
MITSUBISHI ELECTRIC
01 07 2009
JY997D34701
Version B
INDUSTRIAL AUTOMATION

1
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Foreword
This manual contains text, diagrams and explanations which will guide the reader through the safe and
correct installation, use, and operation of the FX Series function for structured programs. It should be read
and understood before attempting to install or use the unit.
Store this manual in a safe place so that you can take it out and read it whenever necessary. Always forward
it to the end user.
© 2009 MITSUBISHI ELECTRIC CORPORATION
Manual number JY997D34701
Manual revision B
Date 7/2009
This manual confers no industrial property rights or any rights of any other kind, nor does it confer any patent licenses.
Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property rights which may occur as a
result of using the contents noted in this manual.

2
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Outline Precautions
• This manual provides information for the use of the FX Series Programmable Controllers. The manual has
been written to be used by trained and competent personnel. The definition of such a person or persons is
as follows;
1) Any engineer who is responsible for the planning, design and construction of automatic equipment using
the product associated with this manual should be of a competent nature, trained and qualified to the
local and national standards required to fulfill that role. These engineers should be fully aware of all
aspects of safety with aspects regarding to automated equipment.
2) Any commissioning or maintenance engineer must be of a competent nature, trained and qualified to the
local and national standards required to fulfill the job. These engineers should also be trained in the use
and maintenance of the completed product. This includes being familiar with all associated manuals and
documentation for the product. All maintenance should be carried out in accordance with established
safety practices.
3) All operators of the completed equipment should be trained to use that product in a safe and coordinated
manner in compliance with established safety practices. The operators should also be familiar with
documentation that is connected with the actual operation of the completed equipment.
Note: the term 'completed equipment' refers to a third party constructed device that contains or uses the
product associated with this manual.
• This product has been manufactured as a general-purpose part for general industries, and has not been
designed or manufactured to be incorporated in a device or system used in purposes related to human life.
• Before using the product for special purposes such as nuclear power, electric power, aerospace, medicine
or passenger movement vehicles, consult with Mitsubishi Electric.
• This product has been manufactured under strict quality control. However when installing the product
where major accidents or losses could occur if the product fails, install appropriate backup or failsafe
functions into the system.
• When combining this product with other products, please confirm the standards and codes of regulation to
which the user should follow. Moreover, please confirm the compatibility of this product with the system,
machines, and apparatuses to be used.
• If there is doubt at any stage during installation of the product, always consult a professional electrical
engineer who is qualified and trained in the local and national standards. If there is doubt about the
operation or use, please consult the nearest Mitsubishi Electric distributor.
• Since the examples within this manual, technical bulletin, catalog, etc. are used as reference; please use it
after confirming the function and safety of the equipment and system. Mitsubishi Electric will not accept
responsibility for actual use of the product based on these illustrative examples.
• The content, specification etc. of this manual may be changed for improvement without notice.
• The information in this manual has been carefully checked and is believed to be accurate; however, if you
notice any doubtful point, error, etc., please contact the nearest Mitsubishi Electric distributor.
Registration
•Microsoft
®and Windows®are either registered trademarks or trademarks of Microsoft Corporation in the
United States and/or other countries.
• CompactFlash is a trademark of SanDisk Corporation in the United States and other countries.
• The company name and the product name to be described in this manual are the registered trademarks or
trademarks of each company.

3
Table of Contents
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Table of Contents
Positioning of This Manual....................................................................................................... 9
Related Manuals...................................................................................................................... 12
Generic Names and Abbreviations Used in Manuals .......................................................... 15
1. Outline 16
1.1 Outline of Structured Programs and Programming languages ..................................................... 16
1.1.1 Outline of Structured Programs ..................................................................................................... 16
1.1.2 Programming languages ............................................................................................................... 17
1.2 PLC Series and Programming Software Version .......................................................................... 17
1.3 Cautions on Creation of Fundamental Programs.......................................................................... 18
1.3.1 I/O PROCESSING AND RESPONSE DELAY .............................................................................. 18
1.3.2 Double output (double coil) operation and countermeasures........................................................ 19
1.3.3 Circuits which cannot be created by structured ladder programs and countermeasures.............. 20
1.3.4 Handling of general flags............................................................................................................... 20
1.3.5 Handling of operation error flag..................................................................................................... 23
1.3.6 Handling of function extension flag................................................................................................ 24
1.3.7 Limitation in number of sequence instructions and number of simultaneous instances
of instructions ................................................................................................................................ 24
2. Instruction List 27
2.1 Basic Instructions .......................................................................................................................... 27
2.2 Step Ladder Instructions ............................................................................................................... 28
2.3 Applied Instructions....................................................................................................................... 28
3. Configuration of Instruction 47
3.1 Expression and Operation Form of Sequence Instructions........................................................... 47
3.2 Labels............................................................................................................................................ 49
3.3 Devices and Addresses ................................................................................................................ 52
3.4 EN and ENO ................................................................................................................................. 53
4. How to Read Explanation of Instructions 54
5. Basic Instruction 56
5.1 LD, LDI, AND, ANI, OR, OR.......................................................................................................... 56
5.2 LDP, LDF, ANDP, ANDF, ORP, ORF ........................................................................................... 61
5.3 OUT (Excluding timers and counters) ........................................................................................... 67
5.4 Operating Timer ............................................................................................................................ 70
5.4.1 OUT_T........................................................................................................................................... 70
5.5 Operating Counters....................................................................................................................... 74
5.5.1 OUT_C, OUT_C_32 ...................................................................................................................... 74
5.6 AND(...), OR(...) ............................................................................................................................ 77
5.7 MPS, MRD, MPP .......................................................................................................................... 79
5.8 INV ................................................................................................................................................ 84
5.9 MEP, MEF..................................................................................................................................... 86
5.10 SET, RST.................................................................................................................................... 88
5.11 PLS, PLF..................................................................................................................................... 92
5.12 MC, MCR .................................................................................................................................... 95
5.13 END............................................................................................................................................. 99

4
Table of Contents
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
5.14 NOP (for simple project only) ...................................................................................................... 99
6. Step Ladder Instructions 100
6.1 Step Ladder................................................................................................................................. 100
6.1.1 Outline ......................................................................................................................................... 100
6.1.2 Function and operation explanation ............................................................................................ 100
6.1.3 Program examples ...................................................................................................................... 108
6.2 STL.............................................................................................................................................. 109
6.3 RET ............................................................................................................................................. 110
7. Applied Instructions 112
7.1 Program Flow.............................................................................................................................. 112
7.1.1 CJ ................................................................................................................................................ 112
7.1.2 CALL............................................................................................................................................ 120
7.1.3 SRET........................................................................................................................................... 126
7.1.4 IRET ............................................................................................................................................ 127
7.1.5 DI................................................................................................................................................. 130
7.1.6 EI ................................................................................................................................................. 131
7.1.7 FEND........................................................................................................................................... 133
7.1.8 WDT ............................................................................................................................................ 135
7.1.9 FOR............................................................................................................................................. 138
7.1.10 NEXT......................................................................................................................................... 139
7.2 Move and Compare..................................................................................................................... 142
7.2.1 CMP............................................................................................................................................. 142
7.2.2 ZCP ............................................................................................................................................. 146
7.2.3 MOV ............................................................................................................................................ 149
7.2.4 SMOV.......................................................................................................................................... 154
7.2.5 CML............................................................................................................................................. 157
7.2.6 BMOV.......................................................................................................................................... 160
7.2.7 FMOV .......................................................................................................................................... 165
7.2.8 XCH............................................................................................................................................. 168
7.2.9 BCD............................................................................................................................................. 170
7.2.10 BIN............................................................................................................................................. 174
7.3 Arithmetic and Logical Operation................................................................................................ 178
7.3.1 ADD............................................................................................................................................. 178
7.3.2 SUB ............................................................................................................................................. 181
7.3.3 MUL............................................................................................................................................. 185
7.3.4 DIV............................................................................................................................................... 189
7.3.5 INC .............................................................................................................................................. 192
7.3.6 DEC............................................................................................................................................. 194
7.3.7 WAND.......................................................................................................................................... 196
7.3.8 WOR............................................................................................................................................ 198
7.3.9 WXOR ......................................................................................................................................... 200
7.3.10 NEG........................................................................................................................................... 203
7.4 Rotation and Shift Operation....................................................................................................... 207
7.4.1 ROR............................................................................................................................................. 207
7.4.2 ROL ............................................................................................................................................. 210
7.4.3 RCR............................................................................................................................................. 213
7.4.4 RCL ............................................................................................................................................. 216
7.4.5 SFTR ........................................................................................................................................... 219
7.4.6 SFTL............................................................................................................................................ 221
7.4.7 WSFR.......................................................................................................................................... 224
7.4.8 WSFL........................................................................................................................................... 227
7.4.9 SFWR.......................................................................................................................................... 230
7.4.10 SFRD......................................................................................................................................... 233
7.5 Data Operation............................................................................................................................ 235
7.5.1 ZRST ........................................................................................................................................... 235
7.5.2 DECO .......................................................................................................................................... 239
7.5.3 ENCO .......................................................................................................................................... 243

5
Table of Contents
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
7.5.4 SUM............................................................................................................................................. 246
7.5.5 BON............................................................................................................................................. 249
7.5.6 MEAN .......................................................................................................................................... 252
7.5.7 ANS ............................................................................................................................................. 254
7.5.8 ANR............................................................................................................................................. 256
7.5.9 SQR............................................................................................................................................. 258
7.5.10 FLT ............................................................................................................................................ 260
7.6 High Speed Processing............................................................................................................... 264
7.6.1 REF ............................................................................................................................................. 264
7.6.2 REFF ........................................................................................................................................... 268
7.6.3 MTR............................................................................................................................................. 272
7.6.4 DHSCS........................................................................................................................................ 276
7.6.5 DHSCR........................................................................................................................................ 284
7.6.6 DHSZ........................................................................................................................................... 288
7.6.7 SPD ............................................................................................................................................. 303
7.6.8 PLSY ........................................................................................................................................... 307
7.6.9 PWM............................................................................................................................................ 314
7.6.10 PLSR ......................................................................................................................................... 317
7.7 Handy Instruction ........................................................................................................................ 322
7.7.1 IST............................................................................................................................................... 322
7.7.2 SER ............................................................................................................................................. 334
7.7.3 ABSD........................................................................................................................................... 338
7.7.4 INCD............................................................................................................................................ 342
7.7.5 TTMR........................................................................................................................................... 345
7.7.6 STMR .......................................................................................................................................... 348
7.7.7 ALT.............................................................................................................................................. 351
7.7.8 RAMP .......................................................................................................................................... 354
7.7.9 ROTC .......................................................................................................................................... 357
7.7.10 SORT......................................................................................................................................... 360
7.8 External FX I/O Device................................................................................................................ 363
7.8.1 TKY.............................................................................................................................................. 363
7.8.2 HKY ............................................................................................................................................. 367
7.8.3 DSW ............................................................................................................................................ 372
7.8.4 SEGD .......................................................................................................................................... 376
7.8.5 SEGL........................................................................................................................................... 378
7.8.6 ARWS.......................................................................................................................................... 383
7.8.7 ASC ............................................................................................................................................. 388
7.8.8 PR................................................................................................................................................ 390
7.8.9 FROM.......................................................................................................................................... 393
7.8.10 TO.............................................................................................................................................. 399
7.9 External Device (optional device)................................................................................................ 402
7.9.1 RS................................................................................................................................................ 402
7.9.2 PRUN .......................................................................................................................................... 405
7.9.3 ASCI ............................................................................................................................................ 407
7.9.4 HEX ............................................................................................................................................. 411
7.9.5 CCD............................................................................................................................................. 415
7.9.6 VRRD .......................................................................................................................................... 419
7.9.7 VRSC........................................................................................................................................... 421
7.9.8 RS2.............................................................................................................................................. 423
7.9.9 PID............................................................................................................................................... 426
7.10 External Device ......................................................................................................................... 430
7.10.1 MNET ........................................................................................................................................ 430
7.10.2 ANRD ........................................................................................................................................ 432
7.10.3 ANWR........................................................................................................................................ 434
7.10.4 RMST ........................................................................................................................................ 435
7.10.5 RMWR....................................................................................................................................... 436
7.10.6 RMRD........................................................................................................................................ 438
7.10.7 RMMN ....................................................................................................................................... 440
7.10.8 BLK............................................................................................................................................ 441
7.10.9 MCDE........................................................................................................................................ 443
7.11 Data Transfer 2 ......................................................................................................................... 444
7.11.1 ZPUSH ...................................................................................................................................... 444
7.11.2 ZPOP......................................................................................................................................... 447

6
Table of Contents
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
7.12 Floating Point ............................................................................................................................ 449
7.12.1 DECMP...................................................................................................................................... 449
7.12.2 DEZCP ...................................................................................................................................... 451
7.12.3 DEMOV ..................................................................................................................................... 453
7.12.4 DESTR ...................................................................................................................................... 455
7.12.5 DEVAL....................................................................................................................................... 462
7.12.6 DEBCD...................................................................................................................................... 468
7.12.7 DEBIN........................................................................................................................................ 470
7.12.8 DEADD...................................................................................................................................... 473
7.12.9 DESUB ...................................................................................................................................... 475
7.12.10 DEMUL.................................................................................................................................... 477
7.12.11 DEDIV...................................................................................................................................... 479
7.12.12 DEXP....................................................................................................................................... 481
7.12.13 DLOGE.................................................................................................................................... 483
7.12.14 DLOG10 .................................................................................................................................. 485
7.12.15 DESQR.................................................................................................................................... 487
7.12.16 DENEG.................................................................................................................................... 489
7.12.17 INT........................................................................................................................................... 491
7.12.18 DSIN........................................................................................................................................ 493
7.12.19 DCOS ...................................................................................................................................... 495
7.12.20 DTAN....................................................................................................................................... 497
7.12.21 DASIN...................................................................................................................................... 499
7.12.22 DACOS.................................................................................................................................... 502
7.12.23 DATAN .................................................................................................................................... 505
7.12.24 DRAD ...................................................................................................................................... 508
7.12.25 DDEG ...................................................................................................................................... 511
7.13 Data Operation 2....................................................................................................................... 513
7.13.1 WSUM ....................................................................................................................................... 513
7.13.2 WTOB........................................................................................................................................ 516
7.13.3 BTOW........................................................................................................................................ 519
7.13.4 UNI ............................................................................................................................................ 522
7.13.5 DIS............................................................................................................................................. 525
7.13.6 SWAP........................................................................................................................................ 527
7.13.7 SORT2....................................................................................................................................... 529
7.14 Positioning Control .................................................................................................................... 534
7.14.1 DSZR......................................................................................................................................... 534
7.14.2 DVIT .......................................................................................................................................... 536
7.14.3 DTBL ......................................................................................................................................... 539
7.14.4 DABS......................................................................................................................................... 541
7.14.5 ZRN ........................................................................................................................................... 543
7.14.6 PLSV ......................................................................................................................................... 547
7.14.7 DRVI.......................................................................................................................................... 551
7.14.8 DRVA......................................................................................................................................... 554
7.15 Real Time Clock Control ........................................................................................................... 557
7.15.1 TCMP ........................................................................................................................................ 557
7.15.2 TZCP ......................................................................................................................................... 560
7.15.3 TADD......................................................................................................................................... 563
7.15.4 TSUB ......................................................................................................................................... 565
7.15.5 HTOS......................................................................................................................................... 567
7.15.6 STOH......................................................................................................................................... 570
7.15.7 TRD ........................................................................................................................................... 573
7.15.8 TWR .......................................................................................................................................... 575
7.15.9 HOUR........................................................................................................................................ 579
7.16 External Device ......................................................................................................................... 582
7.16.1 GRY........................................................................................................................................... 582
7.16.2 GBIN.......................................................................................................................................... 584
7.16.3 RD3A ......................................................................................................................................... 586
7.16.4 WR3A ........................................................................................................................................ 588
7.17 Extension Function.................................................................................................................... 590
7.17.1 EXTR_IN ................................................................................................................................... 590
7.17.2 EXTR_OUT ............................................................................................................................... 593
7.18 Others ....................................................................................................................................... 597
7.18.1 COMRD..................................................................................................................................... 597
7.18.2 RND........................................................................................................................................... 600

7
Table of Contents
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
7.18.3 DUTY......................................................................................................................................... 602
7.18.4 CRC........................................................................................................................................... 605
7.18.5 DHCMOV................................................................................................................................... 609
7.19 Block Data Operation................................................................................................................ 614
7.19.1 BK+............................................................................................................................................ 614
7.19.2 BK-............................................................................................................................................. 618
7.19.3 BKCMP=, BKCMP>, BKCMP<, BKCMP<>, BKCMP<=, BKCMP>=......................................... 622
7.20 Character String Control ........................................................................................................... 629
7.20.1 STR ........................................................................................................................................... 629
7.20.2 VAL............................................................................................................................................ 636
7.20.3 $+ .............................................................................................................................................. 642
7.20.4 LEN............................................................................................................................................ 645
7.20.5 RIGHT ....................................................................................................................................... 648
7.20.6 LEFT.......................................................................................................................................... 651
7.20.7 MIDR ......................................................................................................................................... 654
7.20.8 MIDW......................................................................................................................................... 658
7.20.9 INSTR........................................................................................................................................ 662
7.20.10 $MOV ...................................................................................................................................... 665
7.21 Data Operation 3....................................................................................................................... 668
7.21.1 FDEL ......................................................................................................................................... 668
7.21.2 FINS .......................................................................................................................................... 671
7.21.3 POP ........................................................................................................................................... 674
7.21.4 SFR ........................................................................................................................................... 678
7.21.5 SFL............................................................................................................................................ 681
7.22 Data Comparison ...................................................................................................................... 684
7.22.1 LD=, LD>, LD<, LD<>, LD<=, LD>= .......................................................................................... 684
7.22.2 AND=, AND>, AND<, AND<>, AND<=, AND>= ........................................................................ 688
7.22.3 OR=, OR>, OR<, OR<>, OR<=, OR>= ..................................................................................... 692
7.23 Data Table Operation................................................................................................................ 695
7.23.1 LIMIT ......................................................................................................................................... 695
7.23.2 BAND......................................................................................................................................... 700
7.23.3 ZONE......................................................................................................................................... 706
7.23.4 SCL............................................................................................................................................ 712
7.23.5 DABIN........................................................................................................................................ 717
7.23.6 BINDA........................................................................................................................................ 721
7.23.7 SCL2.......................................................................................................................................... 726
7.24 External Device Communication (Inverter Communication) ..................................................... 732
7.24.1 IVCK .......................................................................................................................................... 732
7.24.2 IVDR.......................................................................................................................................... 735
7.24.3 IVRD.......................................................................................................................................... 738
7.24.4 IVWR ......................................................................................................................................... 740
7.24.5 IVBWR....................................................................................................................................... 742
7.25 Data Transfer 3 ......................................................................................................................... 745
7.25.1 RBFM ........................................................................................................................................ 745
7.25.2 WBFM........................................................................................................................................ 751
7.26 High Speed Processing 2.......................................................................................................... 753
7.26.1 DHSCT ...................................................................................................................................... 753
7.27 Extension File Register Control................................................................................................. 759
7.27.1 LOADR ...................................................................................................................................... 759
7.27.2 SAVER ...................................................................................................................................... 763
7.27.3 INITR ......................................................................................................................................... 772
7.27.4 LOGR ........................................................................................................................................ 776
7.27.5 RWER........................................................................................................................................ 780
7.27.6 INITER....................................................................................................................................... 785
7.28 FX3U-CF-ADP........................................................................................................................... 789
7.28.1 FLCRT....................................................................................................................................... 789
7.28.2 FLDEL ....................................................................................................................................... 793
7.28.3 FLWR ........................................................................................................................................ 795
7.28.4 FLRD ......................................................................................................................................... 798
7.28.5 FLCMD ...................................................................................................................................... 800
7.28.6 FLSTRD..................................................................................................................................... 802

8
Table of Contents
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
8. Interrupt Function and Pulse Catch Function 805
8.1 Outline......................................................................................................................................... 805
8.2 Common items ............................................................................................................................ 806
8.2.1 Interrupt function.......................................................................................................................... 806
8.2.2 How to disable interrupt function and pulse catch function ......................................................... 807
8.2.3 Related items............................................................................................................................... 808
8.2.4 Cautions on use (common) ......................................................................................................... 809
8.3 Input Interrupt (Interrupt Triggered by External Signal) [Without Delay Function] ...................... 811
8.3.1 Input Interrupt (Interrupt Triggered by External Signal) [Without Delay Function]....................... 811
8.3.2 Examples of practical programs (programs to measure short pulse width)................................. 816
8.4 Input Interrupt (Interrupt by External Signal) [With Delay function] ............................................. 818
8.5 Timer Interrupt (Interrupt in Constant Cycle)............................................................................... 819
8.5.1 Timer Interrupt (Interrupt in Constant Cycle) ............................................................................... 819
8.5.2 Example of practical program (timer interrupt program using instruction)................................... 820
8.6 Counter Interrupt - Interrupt Triggered by Counting Up of High Speed Counter......................... 822
8.7 Pulse Catch Function[M8170 to M8177]..................................................................................... 823
8.8 Pulse width/Pulse period measurement function [M8075 to M8083, D8074 to D8097] .............. 825
Appendix A: Relationships between devices and addresses 830
Warranty................................................................................................................................. 832
Revised History ..................................................................................................................... 833

9
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Positioning of This Manual
This manual explains sequence instructions for structured programs provided by GX Works2. Refer to other
manuals for devices, parameters and application functions.
Refer to each corresponding manual for analog, communication, positioning control and special units and
blocks.
1. When using FX3U/FX3UC/FX3G PLCs
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
QCPU/FXCPU Structured Programming Manual (Fundamentals)
This manual explains programming methods, specifications, functions, etc. required to create
structured programs.
Q/FX
Structured
FXCPU Structured Programming Manual (Device & Common)
This manual explains devices and parameters for structured programs provided
by GX Works2.
FX
Structured
FX 3G /FX 3U /FX 3UC Series User's Manual -Positioning Edition
This manual explains details of wiring, instructions and operations of the positioning
function built in FX3U/FX3UC/FX3G PLC main units.
Explanation of instructions and instructions used in program examples are expressed
for GX Developer.
FX 3G /FX 3U /FX 3UC User's Manual- Analog Control Edition
This manual explains details of analog special function blocks and analog special
adapters for FX3U/FX3UC/FX3G PLCs and PID instruction.
Explanation of instructions and instructions used in program examples are expressed
for GX Developer.
FX Series User's Manual -Data Communication Edition
This manual explains details of simple N:N link, parallel link, computer link, no-protocol
communication (RS and RS2 instructions), programming communication and inverter
communication for FX PLCs.
Explanation of instructions and instructions used in program examples are expressed
for GX Developer.
Individual manuals
This manual explains details of each special unit/block.
Explanation of instructions and instructions used in program examples are expressed
for GX Developer.
*1. Detailed explanation may be provided by a separate manual in some products.
FX
Special
unit/block
FX3U
FX3UC
FX3G
FX3U
FX3UC
FX3G
(Manual supplied with product or additional Manual )
*1
FXCPU Structured Programming Manual (Basic & Applied Instruction)
This manual explains sequence instructions for structured programs provided
by GX Works2.
(This manual)
FX
Structured
FXCPU Structured Programming Manual (Application Functions)
This manual explains application functions for structured programs provided
by GX Works2.
FX
Structured
(Additional Manual)
(Additional Manual)
(Additional Manual)

10
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
2. When using FX1S/FX1N/FXU/FX1NC/FX2NC PLCs
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
QCPU/FXCPU Structured Programming Manual (Fundamentals)
This manual explains programming methods, specifications, functions, etc. required to create
structured programs.
Q/FX
Structured
FXCPU Structured Programming Manual (Device & Common)
This manual explains devices and parameters for structured programs provided
by GX Works2.
FX
Structured
FX Series User's Manual -Data Communication Edition
This manual explains details of simple N:N link, parallel link, computer link, no-protocol
communication (RS instruction), programming communication and inverter communication
for FX PLCs.
Explanation of instructions and instructions used in program examples are expressed for
GX Developer and FX-PCS/WIN.
Individual manuals
This manual explains details of each special unit/block.
Explanation of instructions and instructions used in program examples are expressed
for GX Developer and FX-PCS/WIN.
*1. Detailed explanation may be provided by a separate manual in some products.
FX
Special
unit/block
FXCPU Structured Programming Manual (Basic & Applied Instruction)
This manual explains sequence instructions for structured programs provided
by GX Works2.
(This manual)
FX
Structured
FXCPU Structured Programming Manual (Application Functions)
This manual explains application functions for structured programs provided
by GX Works2.
FX
Structured
(Manual supplied with product or additional Manual )
*1
(Additional Manual)

11
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
3. When using FX0/FX0S/FX0N/FXU/FX2C PLCs
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
QCPU/FXCPU Structured Programming Manual (Fundamentals)
This manual explains programming methods, specifications, functions, etc. required to create
structured programs.
Q/FX
Structured
FXCPU Structured Programming Manual (Device & Common)
This manual explains devices and parameters for structured programs provided
by GX Works2.
FX
Structured
FX Series User's Manual -Data Communication Edition
This manual explains details of parallel link, computer link, no-protocol communication
(RS instruction) and programming communication for FX PLCs.
Explanation of instructions and instructions used in program examples are expressed for
GX Developer and FX-PCS/WIN.
Individual manuals
This manual explains details of each special unit/block.
Explanation of instructions and instructions used in program examples are expressed
for GX Developer and FX-PCS/WIN.
*1. Detailed explanation may be provided by a separate manual in some products.
FX
Special
unit/block
FXCPU Structured Programming Manual (Basic & Applied Instruction)
This manual explains sequence instructions for structured programs provided
by GX Works2.
(This manual)
FX
Structured
FXCPU Structured Programming Manual (Application Functions)
This manual explains application functions for structured programs provided
by GX Works2.
FX
Structured
(Manual supplied with product or additional Manual )
*1

12
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Related Manuals
This manual explains devices and parameters for structured programs provided by GX Works2.
Refer to other manuals for sequence instructions and applied functions.
This chapter introduces only reference manuals for this manual and manuals which describe the hardware
information of PLC main units.
Manuals not introduced here may be required in some applications.
Refer to the manual of the used PLC main unit and manuals supplied together with used products.
Contact the distributor for acquiring required manuals.
Common among FX PLCs [structured]
FX3U/FX3UC/FX3G PLCs
Manual name Manual number Supplied with product
or Additional Manual Contents Model name code
QCPU/FXCPU Structured
Programming Manual (Fundamentals) SH-080782 Additional Manual Programming methods, specifications, functions, etc. required to create structured programs 13JW06
FXCPU Structured Programming
Manual (Device & Common) JY997D26001 Additional Manual Devices, parameters, etc. provided in structured projects of GX Works2 09R920
FXCPU Structured Programming
Manual (Basic & Applied Instruction) JY997D34701 Additional Manual Sequence instructions provided in structured projects of GX Works2 09R921
FXCPU Structured Programming
Manual (Application Functions) JY997D34801 Additional Manual Application functions provided in structured projects of GX Works2 09R922
Manual name Manual number Supplied with product
or Additional Manual Contents Model name code
PLC main unit
FX3U Series Hardware Manual JY997D18801 Supplied with product
I/O specifications, wiring and installation of the
PLC main unit FX3U extracted from the FX3U
Series User’s Manual - Hardware Edition. For
detailed explanation, refer to the FX3U Series
User’s Manual - Hardware Edition.
-
FX3U Series User's Manual- Hardware
Edition JY997D16501 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX3U PLC main unit.
09R516
FX3UC (D, DSS) Series Hardware
Manual JY997D28601 Supplied with product
I/O specifications, wiring and installation of the
PLC main unit FX3UC (D, DSS) extracted from the
FX3UC Series User’s Manual - Hardware Edition.
For detailed explanation, refer to the FX3UC
Series User’s Manual - Hardware Edition.
-
FX3UC-32MT-LT-2 Hardware Manual JY997D31601 Supplied with product
I/O specifications, wiring and installation of the
PLC main unit FX3UC-32MT-LT-2 extracted from
the FX3UC Series User’s Manual - Hardware
Edition. For detailed explanation, refer to the
FX3UC Series User’s Manual - Hardware Edition.
-
FX3UC Series User's Manual -
Hardware Edition JY997D28701 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX3UC PLC main unit.
09R519
FX3G Series Hardware Manual JY997D33401 Supplied with product
I/O specifications, wiring and installation of the
PLC main unit FX3G extracted from the FX3G
Series User’s Manual - Hardware Edition. For
detailed explanation, refer to the FX3G Series
User’s Manual - Hardware Edition.
-
FX3G Series User's Manual- Hardware
Edition JY997D31301 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX3G PLC main unit.
09R521

13
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
FX1S/FX1N/FX2N/FX1NC/FX2NC PLCs
Programming
FX3G/FX3U/FX3UC User's Manual-
Analog Control Edition JY997D16701 Additional Manual
Detaileds about the analog special function block
(FX3U-4AD, FX3U-4DA, FX3UC-4AD) and analog
special adapter
(FX3U-****-ADP).
09R619
FX Series User's Manual -Data
Communication Edition JY997D16901 Additional Manual
Details about simple N : N link, parallel link,
computer link and no-protocol communication
(RS instruction and FX2N-232IF).
09R715
FX3G/FX3U/FX3UC Series User's
Manual -Positioning Edition JY997D16801 Additional Manual Details about the positioning function built in the FX3G/FX3U/FX3UC Series. 09R620
FX3U-CF-ADP User's Manual JY997D35401 Additional Manual Describes details of the FX3U-CF-ADP CF card
special adapter. 09R720
Manual name Manual number Supplied with product
or Additional Manual Contents Model name code
PLC main unit
FX1S HARDWARE MANUAL JY992D83901 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX1S PLC main unit.
-
FX1N HARDWARE MANUAL JY992D89301 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX1N PLC main unit.
-
FX2N HARDWARE MANUAL JY992D66301 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX2N PLC main unit.
09R508
FX1NC HARDWARE MANUAL JY992D92101 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX1NC PLC main unit.
(Japanese only)
09R505
FX2NC HARDWARE MANUAL JY992D76401 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX2NC PLC main unit.
09R509
Programming
FX Series User's Manual -Data
Communication Edition JY997D16901 Additional Manual
Details about simple N : N link, parallel link,
computer link and no-protocol communication
(RS instruction and FX2N-232IF).
09R715
Manual name Manual number Supplied with product
or Additional Manual Contents Model name code

14
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
FX0/FX0S/FX0N/FXU/FX2C PLCs [whose production is finished]
Manuals of models whose production is finished
Production is finished for FX0/FX0S/FX0N/FXU/FX2C PLCs.
Manual name Manual number Supplied with product
or Additional Manual Contents Model name code
PLC main unit
FX0/FX0N HARDWARE MANUAL JY992D47501 Supplied with product
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX0/FX0N PLC main unit.
-
FX0S HARDWARE MANUAL JY992D55301 Supplied with product
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX0S PLC main unit.
-
FX/FX2C HARDWARE MANUAL JY992D47401 Supplied with product
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FXU/FX2C PLC main unit.
-
Programming
FX Series User's Manual -Data
Communication Edition JY997D16901 Additional Manual
Details about simple N : N link, parallel link,
computer link and no-protocol communication
(RS instruction and FX2N-232IF).
09R715

15
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Generic Names and Abbreviations Used in Manuals
Abbreviation/generic name Name
PLCs
FX3U Series or FX3U PLC Generic name of FX3U Series PLCs
FX3UC Series or FX3UC PLC Generic name of FX3UC Series PLCs
FX3G Series or FX3G PLC Generic name of FX3G Series PLCs
FX2N Series or FX2N PLC Generic name of FX2N Series PLCs
FX2NC Series or FX2NC PLC Generic name of FX2NC Series PLCs
FX1N Series or FX1N PLC Generic name of FX1N Series PLCs
FX1NC Series or FX1NC PLC Generic name of FX1NC Series PLCs
These products can only used in Japan.
FX1S Series or FX1S PLC Generic name of FX1S Series PLCs
FXUSeries or FXUPLC Generic name of FXU(FX,FX2) Series PLCs
FX2C Series or FX2C PLC Generic name of FX2C Series PLCs
FX0N Series or FX0N PLC Generic name of FX0N Series PLCs
FX0S Series or FX0S PLC Generic name of FX0S Series PLCs
FX0Series or FX0PLC Generic name of FX0Series PLCs
Special adapters
CF card special adapter Generic name of CF card special adapters
CF-ADP FX3U-CF-ADP
Programming language
ST Abbreviation of structured text language
Structured ladder Abbreviation of ladder diagram language
Manuals
Q/FX Structured Programming Manual
(Fundamentals) Abbreviation of QCPU/FXCPU Structured Programming Manual (Fundamentals)
FX Structured Programming Manual
(Device & Common) Abbreviation of FXCPU Structured Programming Manual (Device & Common)
FX Structured Programming Manual
(Basic & Applied Instruction) Abbreviation of FXCPU Structured Programming Manual (Basic & Applied Instruction)
FX Structured Programming Manual
(Application Functions) Abbreviation of FXCPU Structured Programming Manual (Application Functions)
COMMUNICATION CONTROL
EDITION Abbreviation of FX Series User's Manual-DATA COMMUNICATION CONTROL EDITION
ANALOG CONTROL EDITION Abbreviation of FX3G/FX3U/FX3UC Series User's Manual-ANALOG CONTROL EDITION
POSITIONING CONTROL EDITION Abbreviation of FX3G/FX3U/FX3UC Series User's Manual-POSITIONING CONTROL EDITION

1 Outline
1.1 Outline of Structured Programs and Programming
16
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1. Outline
This manual explains setting of sequence instructions for structured programs provided by GX Works2.
Refer to another manuals for device, parameter, and application functions for structured programs.
Refer to the following manual for label, data types and programming languages for structured programs.
→ Q/FX Structured Programming Manual (Fundamentals)
1.1 Outline of Structured Programs and Programming languages
1.1.1 Outline of Structured Programs
You can construct two or more programs (program blocks) into one program.
Because you can divide the entire machine processing into small sub processes and create a program for
each sub process, you can create a program for a large system efficiently.
1. Structured program
Program structuring is a technique to divide the contents of control executed by the PLC CPU into
hierarchical small units (blocks) of processing, and then construct a program. By using this technique, you
can design a program while recognizing structuring of a sequence program.
Advantages of hierarchical program
• You can examine the outline of a program at first, and then design its details gradually.
• Program blocks located at the lowest level in the hierarchy are extremely simple and highly dependent.
Advantages of program consisting of program blocks
• Because the processing of each block is clear, the entire program is easy to understand.
• The entire program can be divided into several blocks that are created by several people.
• The program reusability is improved, and the development efficiency is improved accordingly.
2. Improved reusability of programs
You can save program blocks in a library. Program resources in the library can be shared, and often used
again.

1 Outline
1.2 PLC Series and Programming Software Version
17
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of Instruction
4
How to Read Explanation of Instructions
5
Basic Instruction
6
Step Ladder Instructions
7
Applied Instructions
8
Interrupt Function and Pulse Catch Function
A
Relationships between devices and addresses
1.1.2 Programming languages
The following programming languages can be used in each program block.
Graphic languages
1. Structured ladder language
This graphic language is created based on the relay circuit design technology.
Any circuit always starts from the bus line located on the leftmost.
The structured ladder language consists of contacts, coils, functions and function blocks. These components
are connected with vertical lines and horizontal lines.
Text language
1. ST ("Structured text language")
The ST language can describe control achieved by syntax using selective branches with conditional
statements and repetition by repetitive statements in the same way as high-level languages such as C
language. By using the ST language, you can create simple programs easy to understand.
1.2 PLC Series and Programming Software Version
PLC series Software package name
(model name) GX Works2 version
FX3U•FX3UC
GX Works2
(SW1DNC-GXW2-E) Ver. 1.08J or later
FX3G
FX2N•FX2NC
FX1N•FX1NC
FX1S
FXU•FX2C
FX0N
FX0•FX0S
1
2
X000 X001 Y000
Y000
MOV
EN ENO
sd
D0 D2
When X001 is ON, the contents
of D0 are transferred to D2.
Output Y000
X001
Y000:=(X000 OR Y000) AND NOT X001;
IF X001 THEN
D2:=D0; (* When X001 is ON, the contents of D0 are transferred to D2.*)
END_IF;
IF X002 THEN
D4:=D4+1; (* When X002 is ON, the contents of D4 are added by "1". *)
ELSE
D6:=D6+1; (* When X002 is OFF, the contents of D6 are added by "1". *)
END_IF;

1 Outline
1.3 Cautions on Creation of Fundamental Programs
18
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1.3 Cautions on Creation of Fundamental Programs
This section explains cautions on programming.
Refer to the following manual for cautions on structured programs and programming languages:
→ Q/FX Structured Programming Manual (Fundamentals)
Refer to the following programming manual for detailed operations of and cautions on devices and
parameters:
→ FX Structured Programming Manual (Device & Common)
1.3.1 I/O PROCESSING AND RESPONSE DELAY
1. Operation timing of I/O relays and resonse
delay
FX PLCs execute the I/O processing by repeating
the processing (1) to processing (3).
Accordingly, the control executed by PLCs
contains not only the drive time of input filters and
output devices but also the response delay caused
by the operation cycle.
Acquiring the latest I/O information
For acquiring the latest input information or
immediately outputting the operation result in the
middle of the operation cycle shown above, the I/O
refresh instruction "REF" is available.
2. Short input pulses cannot be received.
The ON duration and OFF duration of inputs in PLCs require longer time than "PLC cycle time + Input filter
response delay."
When the response delay "10 ms" of the input filter is considered and the cycle time is supposed as "10 ms",
the ON duration and OFF duration should be at least 20 ms respectively.
Accordingly, PLCs cannot handle input pulses at 25 Hz (1000 / (20+20) = 25) or more. However, the situation
can be improved by PLC special functions and instructions.
Convenient functions for
improvement
By using the following functions, PLCs
can receive pulses shorter than the
operation cycle.
• High speed counter function
• Input interrupt function
• Pulse catch function
• Input filter value adjustment function
[Input processing]
Input image
memory is read.
[Output processing]
Result is transferred
to output latch
memory.
The ON/OFF status of input terminals
is received at one time.
Input image is read,
and operation is
executed according
to program.
Output
devices
are driven.
Batch I/O method
(refresh method)
(1)
(3)
Scan
time
(operation
cycle)
[Program processing]
Image memory of
each device is updated.
(2)
Program
processing Program processing Program processing Program processing
ON ON OFF
OFF
Input ON"
cannot be received.
This "input ON" can be received.
This "input OFF"
cannot be received.
Input processing
( Time)
Output
processing
Operation cycle