Mitsubishi Electric MELSEC System Q Owner's manual

FXCPU
Structured Programming Manual
Device & Common

1
FXCPU Structured Programming Manual
[Device & Common]
FXCPU Structured Programming Manual
[Device & Common]
Foreword
This manual describes devices and parameters for structured programs used in the MELSEC-F FX Series.
Please read this manual and manuals of relevant products before use, sufficiently understand the
specifications, and use the unit correctly and safely.
See to it that this manual is supplied to the end user.
© 2009 Mitsubishi Electric Corporation
Manual No. JY997D26001
Revision L
Date 4/2015
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 described in this manual.

2
FXCPU Structured Programming Manual
[Device & Common]
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;
a) 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 regards to automated equipment.
b) Any commissioning or service engineer must be of a competent nature, trained and qualified to the
local and national standards required to fulfill that job. These engineers should also be trained in the
use and maintenance of the completed product. This includes being completely familiar with all
associated documentation for the said product. All maintenance should be carried out in accordance
with established safety practices.
c) All operators of the completed equipment should be trained to use that product in a safe and
coordinated manner in compliance to established safety practices. The operators should also be
familiar with documentation which is connected with the actual operation of the completed
equipment.
Note: the term 'completed equipment' refers to a third party constructed device which 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 in the system.
• When combining this product with other products, please confirm the standard and the code, or regulations
with which the user should follow. Moreover, please confirm the compatibility of this product to the system,
machine, and apparatus with which a user is using.
• If in doubt at any stage during the installation of the product, always consult a professional electrical
engineer who is qualified and trained to the local and national standards. If in doubt about the operation or
use, please consult the nearest Mitsubishi Electric representative
• Since the examples indicated by this manual, technical bulletin, catalog, etc. are used as a reference,
please use it after confirming the function and safety of the equipment and system. Mitsubishi Electric will
accept no responsibility for actual use of the product based on these illustrative examples.
• This manual content, specification etc. may be changed without a notice for improvement.
• The information in this manual has been carefully checked and is believed to be accurate; however, you
have noticed a doubtful point, a doubtful error, etc., please contact the nearest Mitsubishi Electric
representative.
Registration
•Microsoft
®, Windows®and Excel®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.
• Ethernet is a trademark of Xerox Corporation.
•MODBUS
®is a registered trademark of Schneider Electric SA.
• 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
[Device & Common]
Table of Contents
Positioning of This Manual....................................................................................................... 6
Related Manuals........................................................................................................................ 9
Generic Names and Abbreviations Used in Manuals .......................................................... 12
1. Device Outline 13
1.1 Devices Constructing PLC ......................................................................................................... 13
1.1.1 Relation among devices ................................................................................................................ 14
1.1.2 Device function list......................................................................................................................... 15
1.2 Program Memory and Devices................................................................................................... 17
1.2.1 Memory structure........................................................................................................................... 17
1.2.2 Memory operations and backup against power interruption (power ON/OFF and RUN/STOP) ... 22
1.2.3 Types of backup methods against power interruption ................................................................... 32
1.2.4 Change of devices between general type and latched (backed-up) type...................................... 33
1.2.5 How to initialize latched (backed-up) type devices........................................................................ 33
2. Devices in Detail 35
2.1 Device Number List..................................................................................................................... 35
2.2 Input/Output Relays [X and Y] ................................................................................................... 37
2.2.1 Numbers of input/output relays...................................................................................................... 37
2.2.2 Functions and roles ....................................................................................................................... 39
2.2.3 Operation timing of I/O relays........................................................................................................ 40
2.3 Auxiliary relay [M] ....................................................................................................................... 41
2.3.1 Numbers of auxiliary relays ........................................................................................................... 41
2.3.2 Functions and operation examples................................................................................................ 42
2.4 State Relay [S] ............................................................................................................................. 44
2.4.1 Numbers of state relays................................................................................................................. 44
2.4.2 Functions and operation examples................................................................................................ 46
2.5 Timer [T]....................................................................................................................................... 48
2.5.1 Numbers of timers ......................................................................................................................... 48
2.5.2 Functions and operation examples................................................................................................ 50
2.5.3 Set value specification method...................................................................................................... 52
2.5.4 Cautions on use............................................................................................................................. 52
2.5.5 Details of timer operations and timer accuracy ............................................................................. 52
2.5.6 Program examples [Off-delay timer and flicker timer] ................................................................... 53
2.5.7 Handling timers as numeric devices.............................................................................................. 54
2.6 Counter [C] .................................................................................................................................. 55
2.6.1 Numbers of counters ..................................................................................................................... 55
2.6.2 Features of counters...................................................................................................................... 56
2.6.3 Related devices (to specify counting direction) [32-bit counter] .................................................... 56
2.6.4 Functions and operation examples................................................................................................ 57
2.6.5 Set value specification method...................................................................................................... 58
2.6.6 Cautions on use............................................................................................................................. 59
2.6.7 Response speed of counters......................................................................................................... 59
2.6.8 Counters handled as numeric devices .......................................................................................... 59
2.7 High Speed Counter [C].............................................................................................................. 62
2.7.1 Types and device numbers of high speed counters ...................................................................... 62
2.7.2 Input assignment for high speed counters..................................................................................... 69
2.7.3 Handling of high speed counters ................................................................................................... 74
2.7.4 Current value update timing and comparison of current value ...................................................... 77
2.7.5 Related devices ............................................................................................................................. 78
2.7.6 Change of logic of external reset input signal................................................................................ 79
2.7.7 Assignment of counter input terminal and switching of function.................................................... 80
2.7.8 How to use 2-phase 2-counting input counters C251 to C255 for 4-edge counting ...................... 82
2.7.9 Condition under which hardware counters are handled as software counters .............................. 83
2.7.10 Response frequency of high speed counters .............................................................................. 84
2.7.11 Cautions on use........................................................................................................................... 92

4
Table of Contents
FXCPU Structured Programming Manual
[Device & Common]
2.8 Data Register and File Register [D] ........................................................................................... 94
2.8.1 Numbers of data registers and file registers.................................................................................. 94
2.8.2 Structure of data registers and file registers.................................................................................. 96
2.8.3 Functions and operation examples of data registers..................................................................... 96
2.8.4 Functions and operation examples of file registers .......................................................................99
2.8.5 Cautions on using file registers ................................................................................................... 103
2.9 Extension Register [R] and Extension File Register [ER] ..................................................... 104
2.9.1 Numbers of extension registers and extension file registers....................................................... 104
2.9.2 Data storage destination and access method ............................................................................. 104
2.9.3 Structure of extension registers and extension file registers ....................................................... 105
2.9.4 Initialization of extension registers and extension file registers................................................... 105
2.9.5 Functions and operation examples of extension registers .......................................................... 106
2.9.6 Functions and operation examples of extension file registers..................................................... 107
2.9.7 Cautions on using extension file registers................................................................................... 109
2.9.8 Registration of data stored in extension registers and extension file registers............................ 111
2.10 Index Register [V and Z] ......................................................................................................... 115
2.10.1 Numbers of index registers........................................................................................................ 115
2.10.2 Functions and structures ........................................................................................................... 116
2.10.3 Indexing of devices.................................................................................................................... 116
2.11 Pointer [P and I]....................................................................................................................... 117
2.11.1 Numbers of pointers .................................................................................................................. 117
2.11.2 Functions and operation examples of branch pointers.............................................................. 118
2.11.3 Functions and operation examples of interrupt pointers............................................................ 119
3. How to Specify Devices and Constants in Instructions 124
3.1 Numeric Values Handled in PLCs (Octal, Decimal, Hexadecimal and Real Numbers)....... 124
3.1.1 Types of numeric values.............................................................................................................. 124
3.1.2 Conversion of numeric values ..................................................................................................... 125
3.1.3 Handling of numeric values in floating point operations .............................................................. 125
3.2 Specification of Constants K, H and E (Decimal, Hexadecimal and Real Numbers) .......... 128
3.2.1 Constant "K" (decimal number) ................................................................................................... 128
3.2.2 Constant "H" (hexadecimal number) ........................................................................................... 128
3.2.3 Constant "E" (real number).......................................................................................................... 128
3.3 Character Strings ...................................................................................................................... 129
3.3.1 Character string constant ("ABC") ............................................................................................... 129
3.3.2 Character string data ................................................................................................................... 129
3.4 Specification of Digits for Bit Devices (Kn***) ..................................................................... 131
3.5 Specification of Bit for Word Device [D.b] ........................................................................... 132
3.6 Direct Specification of Buffer Memory (U\G) ..................................................................... 132
3.7 Indexing ..................................................................................................................................... 133
3.7.1 Indexing in basic instructions....................................................................................................... 133
3.7.2 Indexing in instructions................................................................................................................ 134
3.7.3 Indexing example for instructions whose number of times of use is restricted............................ 137
4. Operations of Special Devices (M8000 and later, D8000 and later) 138
4.1 Special Device List (M8000 and later, D8000 and later)......................................................... 138
4.1.1 Special auxiliary relays (M8000 and later)................................................................................... 138
4.1.2 Special data registers (D8000 and later)..................................................................................... 177
4.2 Supplement of Special Devices (M8000 and later and D8000 and later).............................. 216
4.2.1 RUN monitor and initial pulse [M8000 to M8003] ........................................................................ 216
4.2.2 Watchdog timer time [D8000] ...................................................................................................... 217
4.2.3 Low battery voltage detection [M8005 and M8006]..................................................................... 217
4.2.4 Power interruption detection time [D8008, M8008 and M8007] .................................................. 218
4.2.5 Operation cycle (scan time) monitor [D8010 to D8012]............................................................... 219
4.2.6 Internal clock [M8011 to M8014] ................................................................................................. 219
4.2.7 Real-time clock [M8015 to M8019 and D8013 to D8019]............................................................ 220
4.2.8 How to set real-time clock ........................................................................................................... 221
4.2.9 Input filter adjustment [D8020]([D8021])...................................................................................... 223

5
Table of Contents
FXCPU Structured Programming Manual
[Device & Common]
4.2.10 Battery [BATT (BAT)] LED OFF command [M8030].................................................................. 228
4.2.11 Built-in analog variable potentiometers [D8030, D8031, D8013]............................................... 230
4.2.12 Clear command [M8031 and M8032] ........................................................................................ 231
4.2.13 Memory hold stop [M8033] (Output holding in STOP mode)..................................................... 231
4.2.14 All output disable command [M8034] ........................................................................................ 231
4.2.15 Independent operation for RUN/STOP input [M8035 to M8037] ............................................... 232
4.2.16 Constant scan mode [M8039 and D8039] (Fixed scan time) .................................................... 233
4.2.17 State control in program by STL instruction [M8040] ................................................................ 233
4.2.18 Analog expansion boards [M8260 to M8279 and D8260 to D8279].......................................... 234
4.2.19 Analog special adapters [M8260 to M8299 and D8260 to D8299]
(FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs) .................................................................................. 236
5. Errors 243
5.1 FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs...................................................................................... 243
5.1.1 Error detection devices................................................................................................................ 243
5.1.2 Error Code List and Action .......................................................................................................... 245
5.2 FX1S/FX1N/FX1NC/FX2N/FX2NC PLCs...................................................................................... 254
5.2.1 Error detection devices................................................................................................................ 254
5.2.2 Error Code List and Action .......................................................................................................... 256
5.3 FX0S/FX0/FX0N/FXU/FX2C PLCs............................................................................................... 263
5.3.1 Error detection devices................................................................................................................ 263
5.3.2 Error Code List and Action .......................................................................................................... 265
6. Types and Setting of Parameters 269
6.1 Parameter List ........................................................................................................................... 270
6.2 Parameter Initial Values............................................................................................................ 273
6.3 Memory Capacity Setting Range ............................................................................................. 275
6.4 Compatible Optional Memory Models..................................................................................... 277
6.5 Keyword ..................................................................................................................................... 279
6.5.1 PLC applicability and access restriction ...................................................................................... 279
6.5.2 Registering and changing keywords............................................................................................ 281
6.6 Parameter setting by GX Works2 ............................................................................................ 284
6.6.1 PLC Parameter setting ................................................................................................................ 284
6.6.2 Network parameter ...................................................................................................................... 298
6.6.3 Transferring parameters (, sequence program and symbolic information*1) to the PLC ............. 302
7. Other Functions 303
7.1 Symbolic information storage and block password.............................................................. 303
7.1.1 Storage of symbolic information .................................................................................................. 303
7.1.2 Block password ........................................................................................................................... 303
Warranty................................................................................................................................. 305
Revision History.................................................................................................................... 306

Positioning of This Manual
6
FXCPU Structured Programming Manual
[Device & Common]
Positioning of This Manual
This manual explains devices and parameters for structured programs provided by GX Works2. Refer to
other manuals for sequence instructions and application functions.
Refer to each corresponding manual for analog, communication, positioning control and special units and
blocks.
1. When using FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
MELSEC-Q/L/F Structured Programming Manual (Fundamentals)
This manual explains programming methods, specifications, functions, etc. required to create
structured programs.
Q/L/F
Structured
FXCPU Structured Programming Manual [Device & Common]
This manual explains devices and parameters for structured programs provided
by GX Works2.
FX
Structured
FX3S/FX3G/FX3GC/FX3U/FX3UC Series User's Manual -Positioning Edition
This manual explains details of wiring, instructions and operations of the positioning
function built in FX3S/FX3G/FX3GC/FX3U/FX3UC PLC main units.
Explanation of instructions and instructions used in program examples are expressed
for GX Developer.
FX 3S/FX3G/FX3GC/FX3U/FX3UC User's Manual- Analog Control Edition
This manual explains details of analog special function blocks and analog special
adapters for FX3S/FX3G/FX3GC/FX3U/FX3UC 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
FX 3S
FX 3G
FX 3GC
FX 3U
FX 3UC
FX 3S
FX 3G
FX 3GC
FX 3U
FX 3UC
(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)

Positioning of This Manual
7
FXCPU Structured Programming Manual
[Device & Common]
2. When using FX1S/FX1N/FX1NC/FX2N/FX2NC PLCs
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
MELSEC-Q/L/F Structured Programming Manual [Fundamentals]
This manual explains programming methods, specifications, functions, etc. required to create
structured programs.
Q/L/F
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)

Positioning of This Manual
8
FXCPU Structured Programming Manual
[Device & Common]
3. When using FX0S/X0/FX0N/FXU/FX2C PLCs
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
(Additional Manual)
MELSEC-Q/L/F Structured Programming Manual (Fundamentals)
This manual explains programming methods, specifications, functions, etc. required to create
structured programs.
Q/L/F
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

Related Manuals
9
FXCPU Structured Programming Manual
[Device & Common]
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 representative for acquiring required manuals.
Common among FX PLCs [structured]
FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs
Manual name Manual number Supplied with product
or Additional Manual Contents Model name code
MELSEC-Q/L/F 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 09R925
FXCPU Structured Programming
Manual [Basic & Applied Instruction] JY997D34701 Additional Manual Sequence instructions provided in structured projects of GX Works2 09R926
FXCPU Structured Programming
Manual [Application Functions] JY997D34801 Additional Manual Application functions provided in structured projects of GX Works2 09R927
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, DS, DSS) Series Hardware
Manual JY997D28601 Supplied with product
I/O specifications, wiring and installation of the
PLC main unit FX3UC (D, DS, 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 JY997D46001 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
FX3GC Series Hardware Manual JY997D45201 Supplied with product
I/O specifications, wiring and installation of the
PLC main unit FX3GC extracted from the FX3GC
Series User's Manual - Hardware Edition. For
detailed explanation, refer to the FX3GC Series
User's Manual - Hardware Edition.
-
FX3GC Series User's Manual-
Hardware Edition JY997D45401 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX3GC PLC main unit.
09R533

Related Manuals
10
FXCPU Structured Programming Manual
[Device & Common]
FX1S/FX1N/FX1NC PLCs
FX2N/FX2NC PLCs [whose production is finished]
PLC main unit
FX3S Series Hardware Manual JY997D48301 Supplied with product
I/O specifications, wiring and installation of the
PLC main unit FX3S extracted from the FX3S
Series User's Manual - Hardware Edition. For
detailed explanation, refer to the FX3S Series
User's Manual - Hardware Edition.
-
FX3S Series User's Manual -
Hardware Edition JY997D48601 Additional Manual
Details about the hardware including I/O
specifications, wiring, installation and
maintenance of the FX3S PLC main unit.
09R535
Programming
FX3S/FX3G/FX3GC/FX3U/FX3UC User's
Manual- Analog Control Edition JY997D16701 Additional Manual
Details 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
FX3S/FX3G/FX3GC/FX3U/FX3UC Series
User's Manual - MODBUS Serial
Communication Edition
JY997D26201 Additional Manual Explains the MODBUS serial communication
network in FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs. 09R626
FX3S/FX3G/FX3GC/FX3U/FX3UC Series
User's Manual -Positioning Edition JY997D16801 Additional Manual Details about the positioning function built in the FX3S/FX3G/FX3GC/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

Related Manuals
11
FXCPU Structured Programming Manual
[Device & Common]
FX0S/FX0/FX0N/FXU/FX2C PLCs [whose production is finished]
Manuals of models whose production is finished
Production is finished for FX0S/FX0/FX0N/FXU/FX2C/FX2N/FX2NC 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

Generic Names and Abbreviations Used in Manuals
12
FXCPU Structured Programming Manual
[Device & Common]
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
FX3GC Series or FX3GC PLC Generic name of FX3GC Series PLCs
FX3S Series or FX3S PLC Generic name of FX3S 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
Ethernet adapter Abbreviated name for FX3U-ENET-ADP
Programming language
ST Abbreviation of structured text language
Structured ladder Abbreviation of ladder diagram language
FBD Abbreviation of function block diagram language
Manuals
Q/L/F Structured Programming
Manual (Fundamentals) Abbreviation of MELSEC-Q/L/F 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 FX3S/FX3G/FX3GC/FX3U/FX3UC Series User's Manual-ANALOG CONTROL
EDITION
POSITIONING CONTROL EDITION Abbreviation of FX3S/FX3G/FX3GC/FX3U/FX3UC Series User's Manual-POSITIONING CONTROL
EDITION

1 Device Outline
1.1 Devices Constructing PLC
13
FXCPU Structured Programming Manual
[Device & Common]
1
Device Outline
2
Devices in Detail
3
Specified the Device & Constant
4
Special Device
5
Errors
6
Types and Setting of Parameters
7
Other Functions
1. Device Outline
This chapter explains basic contents of devices.
1.1 Devices Constructing PLC
Each PLC has many built-in relays, timers, counters, etc.
Each of which has many normally-open contacts and normally-closed contacts.
Connect these contacts and coils to construct a program.
Each PLC also has built-in memory devices including data registers (D) and extension registers (R) to store
numeric data.

1 Device Outline
1.1 Devices Constructing PLC
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[Device & Common]
1.1.1 Relation among devices
Arrow indicates signal transfer.
4123
Input terminal or
input connector
Input relay: X
The PLC receives signals from external input switches via input relays.
The symbol of input relay is "X".
The PLC has built-in input relays in accordance with its scale.
Auxiliary relay: M
The PLC has many
built-in auxiliary
relays.
The symbol of
auxiliary relay is "M".
State relay: S
The PLC has many
built-in state relays.
The symbol of state
relay is "S".
Timer: T
The PLC has many
built-in timers.
The symbol of timer
is "T".
Counter: C
The PLC has many
built-in counters.
The symbol of
counter is "C".
Output relay: Y
The PLC drives
external loads via
output relays.
The PLC has many
built-in output relays.
The symbol of
output relay is "Y".
Output terminal or
output connector
Contact (one normally-open contact) for external output of output relay
The PLC has built-in output contacts in accordance with its scale.

1 Device Outline
1.1 Devices Constructing PLC
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[Device & Common]
1
Device Outline
2
Devices in Detail
3
Specified the Device & Constant
4
Special Device
5
Errors
6
Types and Setting of Parameters
7
Other Functions
1.1.2 Device function list
1. Input relay (X) and output relay (Y)
→ Refer to Section 2.2.
• In the PLC main unit, input relays and output relays are assigned with serial octal numbers such as "X000
to X007", "X010 to X017", "Y000 to Y007" and "Y010 to Y017".
In extension units and extension blocks, input relays and output relays are also assigned with serial octal
numbers in the connection order from the PLC main unit.
• Digital filters are used in specified input relays, and the filter value can be changed in programs.
Accordingly, assign input relay numbers having input filter for applications requiring high-speed receiving.
(Refer to explanation of filter adjustment, input interrupt, high speed counter and various instructions.)
2. Auxiliary relay (M)
→ Refer to Section 2.3.
• Auxiliary relays are built in the PLC. Different from input relays and output relays, auxiliary relays cannot
receive external inputs or cannot drive external loads directly.
Auxiliary relays are available only in programs.
• In some auxiliary relays, the ON/OFF status is backed up against interruption of the PLC power.
3. State relay (S)
→ Refer to Section 2.4.
• State relays are used as process numbers in the step ladder.
• If state relays are not used as process numbers, they can be programmed as general contacts/coils in the
same way as auxiliary relays.
• State relays can be used as annunciators for external failure diagnosis.
4. Timer (T)
→ Refer to Section 2.5.
• Timers count clock pulses (1 ms, 10 ms, 100 ms, etc.) inside the PLC.
When the count value reaches the set value, output contacts are activated.
Timers can measure 0.001 to 3276.7 seconds in accordance with the base clock pulse.
5. Counter (C)
Counters are classified into the following types, and can be used for suitable purposes and applications.
1) Counter (latched type)
→ Refer to Section 2.6.
Counters are used for signals inside the PLC. The response speed is several tens of Hz or less usually.
- 16-bit counter: For up-counting, counting range: 1 to 32767
- 32-bit counter: For up/down-counting, counting range: -2,147,483,648 to +2,147,483,647
2) High speed counter (latched type backed up against power interruption)
→ Refer to Section 2.7.
High speed counters can count several kHz without regard to operations in the PLC.
- 32-bit counter: For up/down-counting, counting range: -2,147,483,648 to +2,147,483,647
(1-phase 1-counting, 1-phase 2 counting or 2-phase 2 counting) assigned to specific input relays
6. Data register (D)
→ Refer to Section 2.8.
Data registers store numeric data.
FX PLCs have only 16-bit data registers (whose most significant bit indicates the positive or negative sign),
but two combined data registers can handle 32-bit numeric value (whose most significant bit indicates the
positive or negative sign). (Refer to "5. Counter" for the available numeric range.)
Data registers are classified into the general type and the latched type (backed up against power interruption)
in the same way as other devices.

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7. Extension register (R) and extension file register (ER)
→ Refer to Section 2.9.
Only FX3G/FX3GC/FX3U/FX3UC PLCs support extension registers (R) and extension file registers (ER).
Extension registers(R) are extended type of data registers (D), and backed up against power interruption by
battery in FX3U/FX3UC PLCs.
In FX3G/FX3GC PLCs, general type devices can be backed up against power interruption if an optional battery
is connected.
FX3G/FX3GC/FX3U/FX3UC PLCs can store the contents of extension registers (R) in extension file registers
(ER). However, FX3U/FX3UC PLCs can use extension file registers (ER) only while a memory cassette is
attached.
8. Index register (V and Z)
→ Refer to Section 2.10.
Registers (V) (Z) are available for indexing.
Add index registers (V) (Z) to other devices as follows:
[In the case of "V0 = 5, Z0 = 5]
D100V0 = D105, C20Z0 = C25 ←Device number + Value of Vor Z
Data registers and index registers are used to indirectly specify set values of timers and counters, or used in
instructions.
9. Pointer (P and I)
→ Refer to Section 2.11.
Pointers are classified into the branch type and the interrupt type.
• Branch pointers (P) specify the jump destination of the CJ (FNC 00: Conditional jump) and CALL
(subroutine call) instructions.
• Interrupt pointers (I) specify the interrupt routine for input interrupt, timer interrupt or counter interrupt.
10.Constant (K, H and E)
→ Refer to Chapter 3.
Among various numeric values used in PLCs, "K" indicates "decimal integer", "H" indicates "hexadecimal
value", and "E" indicates "real number (floating point data)".
Constants are used for set values and current values of timers and counters as well as input variables of
instructions.

1 Device Outline
1.2 Program Memory and Devices
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FXCPU Structured Programming Manual
[Device & Common]
1
Device Outline
2
Devices in Detail
3
Specified the Device & Constant
4
Special Device
5
Errors
6
Types and Setting of Parameters
7
Other Functions
1.2 Program Memory and Devices
1.2.1 Memory structure
1. FX3U and FX3UC PLCs
CPU System ROM
Optional memory
(Flash memory)
Parameter
File register (D)
Comment
Sequence program
Extension file register (ER)
The PLC automatically recognizes attachment of
an optional memory (when the power is turned ON),
and isolates the built-in program memory.
(The PLC gives the priority to the optional memory.)
Built-in device memory(RAM)
[Bit device memory]
Data register (D)
Timer current value register (T)
Counter current value register (C)
Index register (V and Z)
Contact image memory
Input relay (X) Output relay (Y)
Auxiliary relay (M) State relay (S)
Timer contact, time counting coil,
counter contact, counting coil and reset coil Extension register (R)
[Data memory]
Transfer/initialization by instruction
Built-in program memory(RAM)
Parameter
File register (D)
Comment
Sequence program
Special setting
Symbolic information*1 Symbolic information*1
Special setting
*1. Supported in Ver. 3.00 or later.

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1.2 Program Memory and Devices
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[Device & Common]
2. FX3G and FX3GC PLCs
*1. Optional memory cannot be connected to FX3GC PLCs.
CPU System ROM
Optional memory*1
(EEPROM)
Extension file register (ER)
Built-in device memory(RAM, EEPROM)
[Bit device memory] [Data memory]
Built-in program memory(EEPROM)
Extension file register (ER)
Parameter
File register (D)
Comment
Sequence program
Transfer/initialization by instruction
Parameter
File register (D)
Comment
Sequence program
Special setting
Special setting
Data register (D)
Timer current value register (T)
Counter current value register (C)
Index register (V and Z)
Extension register (R)
Contact image memory
Input relay (X) Output relay (Y)
Auxiliary relay (M) State relay (S)
Timer contact, time counting coil, reset coil (T),
counter contact, counting coil and reset coil (C)
Transfer/initialization
by instruction
The PLC automatically recognizes attachment of
an optional memory*1 (when the power is turned ON),
and isolates the built-in program memory.
(The PLC gives the priority to the optional memory.)