Delta DVP-ES2 User manual

www.deltaww.com
DVP-ES2/EX2/SS2/
SA2/SX2/SE&TP
Operation Manual - Programming
2017-04-26
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DVP-ES2/EX2/SS2/SA2/SX2/SE&TP Operation Manual - Programming

DVP-ES2/EX2/SS2/SA2/SX2/SE&TP
Operation Manual
Programming
Revision History
Issue Description of Changes Date
First
version The first edition is issued. 2010/02/26
Second
version The second edition is issued. 2011/03/03
Third
version
1. Chapter 2.8 M Relay: Add M1037, M1119,
M1182, M1308, M1346, and M1356, and update
the description of the functions of
M1055~M1057and M1183.
2. Chapter 2.13 Special Data Register: Add D1037,
D1312, D1354, and D1900~D1931, and modify
the attributes of the latched functions of D1062,
D1114, D1115, and D1118.
3. Chapter 2.16 Applications of Special M Relays
and D Registers: Update the description of the
functions of RTCs; add M1037, D1037（Enable
SPD function）, M1119（Enable 2-speed output
function of DDRVI instruction）, M1308, D1312
（Output specified pulses or seek Z phase
signal when zero point is achieved）, and M1346
（Output clear signals when ZRN is completed）;
Easy PLC Link is changed to PLC Link, and the
description is added.
4. Chapter 3.1 Basic Instructions (without API
numbers) and Chapter 3.2 Explanations to Basic
Instructions: Add NP and PN instructions, and
add Chapter 3.7 Numerical List of Instructions
(in alphabetic order)
2011/09/29

Issue Description of Changes Date
5. Chapter 3.6 Numerical List of Instructions and
Chapter 3.8 Detailed Instruction Explanation:
Increase explanations of DSPA instruction, and
add floating-point contact type comparison
instructions FLD=, FLD>, FLD<, FLD<>, FLD<=,
FLD>=, FAND=, FAND>, FAND<, FAND<>,
FAND<=, FAND>=, FOR=, FOR>, FOR<, FOR<>,
FOR<=, FOR>=; add the supplementary
description of PLSR instruction and the
description of K11~K19 in DTM instruction
mode; update the description of API166
instruction.
Fourth
version
1. SE is added in the title of the manual.
2. Chapter 2.16: The default value in D1062 is K10.
3. API 15 in Chapter 3: The contents about S<D are
deleted in program example 3.
4. API 148 and API 149 are added in Chapter 3.
5. The information related to DVP-SE is added.
6. The information related to DVP32ES-C is added.
7.
The descriptions of the models are added in the
contents.
8. Appendix A is added.
2012/07/01
Fifth
version
1. API 113 is added.
2. API150 is updated.
3. Chapter 7 is updated.
2012/09/01
Sixth
version
1. M1148, M1580, M1581, M1584, M1585, M1182,
and M1183 are added to Chapter 2.
2. Chapter 3 is updated. API53, API 156, API 159,
API69, API88, API143, API150, API155, API258,
and API296-313 are added.
3. The description of API 178 is updated.
4. The description of the input/output mapping
areas for DVP-ES2-C as a slave station is added
to section 7.1.2.
5. C232, C249, and C250 are deleted from the
description of the SE memory Map.
2013/02/20

Issue Description of Changes Date
6. Appendix B is added.
7. Appendix C is added.
Seventh
version
1. The timer interrupts I805~I899 are added to
Chapter2. The special auxiliary relays
M1357~M1359, M1590, M1598, and M1599 are
added to the table of special auxiliary relays. The
descriptions of D1027 and D9998 in the table of
special data registers are updated.
D1056~D1059, D1150~D1153, D1246~D1247,
and D9999 are added to the table of special data
registers. The definitions of the pins in COM1 are
added to the description of M1035. The new
special auxiliary relays in the table of special
data registers and the new special data registers
in the table of special data registers are
described in section 2.16.
2. API114, API115, API145, and API295 are added
to Chapter 3. The descriptions of API17, API22,
API23, API59, API78, API80, API81, API83,
API101~API106, API112-API113, API150,
API166, API179, and API197 are updated.
3.
The information about M1040 is added to Chapter
5.
4. The description of the error code C450 is added
to Chapter 6.
5. In Appendix C, the information about TP04P
series text panels is changed to the information
about TP series text panels.
6. Appendix D is added. It introduces the current
consumption of slim PLCs/extension modules.
2014/07/04
Eighth
version
1. In section B.1, the number of RTU modules onto
which a DVP-SE series PLC can be mapped is
updated.
2. In section B.2.2, the descriptions of
CR#20~CR#86 are updated.
3. In section B.2.3, the descriptions of
2014/08/29

Issue Description of Changes Date
CR#17~CR#24 are updated, the description of
CR#27 is added, and the descriptions of
CR#87~CR103 are updated.
4. In section B.2.4, the descriptions of CR#0 and
CR#20~CR#26 are updated.
5. Section B.6 is added.
Ninth
version
1. Chapter 2: add Ethernet descriptions in section
2.1, update M1119, M1334, M1338,
M1700~M1731 in section 2.8, updated
software/hardware high speed counter
descriptions in section 2.12, add D1021
descriptions in section 2.13, add interrupt
descriptions in section 2.15, add D1021, M1334,
M1335 and update M1119 and PLC link
descriptions in section 2.16.
2. Chapter 3: update instruction list. Update
API113, API15, API17, API51, API59, API68,
API76, API80, API123, API150, API158, API159,
API206, and add new instruction descriptions
API337.
3.
Chapter 4: update Modbus address for SE series
in section 4.4.
4. Chapter 6: delete error codes C430, C441, and
C442. A
dd new error codes C430, C437 and C438
in section 6.2.
5. Appendix A: add descriptions of the USB
installation in Windows 10.
6. Appendix B: add descriptions of ES2-E series.
7. Appendix C: update descriptions of program
capacity for TP series.
8. Appendix D: add descriptions for
28SS2/28SA2/26SE.
2017/04/26

i
DVP-ES2/EX2/SS2/SA2/SX2/SE&TP
Operation Manual
Programming
Contents
1 PLC Concepts
1.1 PLC Scan Method.....................................................................................1-2
1.2 Current Flow..............................................................................................1-3
1.3 NO Contact, NC Contact...........................................................................1-3
1.4 PLC Registers and Relays ........................................................................1-3
1.5 Ladder Logic Symbols...............................................................................1-3
1.5.1 Creating a PLC Ladder Program........................................................1-5
1.5.2 LD / LDI (Load NO contact / Load NC contact) ..................................1-6
1.5.3 LDP / LDF (Load Rising edge trigger/ Load Falling edge trigger).......1-6
1.5.4 AND /ANI (Connect NO contact in series / Connect NC contact in
series) ................................................................................................1-6
1.5.5 ANDP / ANDF (Connect Rising edge in series/ Connect Falling edge in
series) ................................................................................................1-6
1.5.6 OR / ORI (Connect NO contact in parallel / Connect NC contact in
parallel) ..............................................................................................1-6
1.5.7 ORP / ORF (Connect Rising edge in parallel/ Connect Falling edge in
parallel) ..............................................................................................1-6
1.5.8 ANB (Connect block in series) ...........................................................1-6
1.5.9 ORB (Connect block in parallel).........................................................1-7
1.5.10 MPS / MRD / MPP (Branch instructions)............................................1-7
1.5.11 STL (Step Ladder Programming)........................................................1-7
1.5.12 RET (Return)......................................................................................1-8
1.6 Conversion between Ladder Diagram and Instruction List Mode..............1-9
1.7 Fuzzy Syntax...........................................................................................1-10
1.8 Correcting Ladder Diagram.....................................................................1-11
1.9 Basic Program Design Examples............................................................1-13
2Programming Concepts
2.1 ES2/EX2 Memory Map..............................................................................2-2
2.2 SS2 Memory Map......................................................................................2-4
2.3 SA2/SX2 Memory Map..............................................................................2-6
2.4 SE Memory Map........................................................................................2-9
2.5 Status and Allocation of Latched Memory...............................................2-11
2.6 PLC Bits, Nibbles, Bytes, Words, etc.......................................................2-12
2.7 Binary, Octal, Decimal, BCD, Hex...........................................................2-12
2.8 M Relay...................................................................................................2-13
2.9 S Relay....................................................................................................2-22
2.10 T (Timer)..................................................................................................2-22
2.11 C (Counter)..............................................................................................2-23

ii
2.12 High-speed Counters..............................................................................2-25
2.13 Special Data Register .............................................................................2-29
2.14 E, F Index Registers................................................................................2-38
2.15 Nest Level Pointer[N], Pointer[P], Interrupt Pointer [I].............................2-39
2.16 Applications of Special M Relays and D Registers..................................2-41
3 Instruction Set
3.1 Basic Instructions (without API numbers)..................................................3-2
3.2 Explanations to Basic Instructions.............................................................3-2
3.3 Pointers...................................................................................................3-13
3.4 Interrupt Pointers.....................................................................................3-13
3.5 Application Programming Instructions.....................................................3-15
3.6 Numerical List of Instructions (classified according to the function)........3-24
3.7 Numerical List of Instructions (in alphabetic order) .................................3-33
3.8 Detailed Instruction Explanation..............................................................3-40
4 Communications
4.1 Communication Ports................................................................................4-2
4.2 Communication Protocol ASCII mode.......................................................4-3
4.2.1 ADR (Communication Address).........................................................4-3
4.2.2 CMD (Command code) and DATA.....................................................4-4
4.2.3 LRC CHK (checksum)........................................................................4-5
4.3 Communication Protocol RTU mode.........................................................4-7
4.3.1 Address (Communication Address)....................................................4-7
4.3.2 CMD (Command code) and DATA.....................................................4-7
4.3.3 CRC CHK (check sum)......................................................................4-8
4.4 PLC Device Address...............................................................................4-10
4.5 Command Code......................................................................................4-12
4.5.1 Command Code: 01, Read Status of Contact (Input point X is not
included)..........................................................................................4-12
4.5.2 Command Code: 02, Read Status of Contact (Input point X is included)
.........................................................................................................4-13
4.5.3 Command Code: 03, Read Content of Register (T, C, D)................4-14
4.5.4 Command Code: 05, Force ON/OFF single contact ........................4-15
4.5.5 Command Code: 06, Set content of single register..........................4-16
4.5.6 Command Code: 15, Force ON/OFF multiple contacts....................4-16
4.5.7 Command Code: 16, Set content of multiple registers.....................4-17
5Sequential Function Chart
5.1 Step Ladder Instruction [STL], [RET]........................................................5-2
5.2 Sequential Function Chart (SFC)..............................................................5-2
5.3 The Operation of STL Program.................................................................5-4
5.4 Points to Note for Designing a Step Ladder Program .............................5-10
5.5 Types of Sequences ...............................................................................5-12
5.6 IST Instruction.........................................................................................5-23

iii
6 Troubleshooting
6.1 Common Problems and Solutions.............................................................6-2
6.2 Error code Table (Hex)..............................................................................6-4
6.3 Error Detection Devices.............................................................................6-6
7 CANopen Function and Operation
7.1 The Introduction of CANopen....................................................................7-2
7.1.1 The Description of the CANopen Functions.......................................7-2
7.1.2 The Input/Output Mapping Areas .......................................................7-3
7.2 The Installation and the Network Topology ...............................................7-3
7.2.1 The Dimensions.................................................................................7-3
7.2.2 The Profile..........................................................................................7-4
7.2.3 The CAN Interface and the Network Topology...................................7-4
7.3 The CANopen Protocol..............................................................................7-9
7.3.1 The Introduction of the CANopen Protocol.........................................7-9
7.3.2 The CANopen Communication Object .............................................7-10
7.3.3 The Predefined Connection Set.......................................................7-15
7.4 Sending SDO, NMT and Reading Emergency Message through the Ladder
Diagram...................................................................................................7-16
7.4.1 Data Structure of SDO Request Message........................................7-16
7.4.2 Data Structure of NMT Message......................................................7-18
7.4.3 Data Structure of EMERGENCY Request Message.........................7-19
7.4.4 Example on Sending SDO through the Ladder Diagram..................7-21
7.5 Indicators and Troubleshooting...............................................................7-23
7.5.1 Description of Indicators...................................................................7-23
7.5.2 CANopen Network Node State Display............................................7-24
7.6 Application Example................................................................................7-26
7.7 Object Dictionary.....................................................................................7-34
Appendix A
A.1 Installing the USB Driver in Windows 7....................................................A-2
A.2 Installing the USB in Windows 8...............................................................A-4
A.3 Installing the USB Driver in Windows 10..................................................A-7
Appendix B
B.1 Specifications for an Ethernet PLC/Module..............................................B-2
B.2 Ethernet Control Registers.......................................................................B-2
B.2.1 Station Addresses of Ethernet Modules.............................................B-2
B.2.2 DVP-SE Series PLC (Ethernet PLC).................................................B-2
B.2.3 DVPEN01-SL (Left-side Ethernet Communication Module) ..............B-4
B.2.4 DVP-FEN01 (DVP-EH3 Series Ethernet Communication Card) .......B-6
B.3 Searching for an Ethernet PLC.................................................................B-6
B.3.1 Communication setting......................................................................B-7
B.3.2 Broadcast Search..............................................................................B-8
B.3.3 Searching for a Model Specified........................................................B-9

iv
B.3.4 Searching by an IPAddress.............................................................B-11
B.4 Data Exchange....................................................................................... B-12
B.5 EtherNet/IP List...................................................................................... B-12
B.5.1 EtherNet/IP Information Supported by DVP-SE series PLCs.......... B-13
B.5.2 EtherNet/IP Objects Supported by DVP-SE series PLCs................ B-14
B.6 RTU Mapping......................................................................................... B-17
B.6.1 Setting the RTU Mapping................................................................ B-17
B.6.2 Application of the RTU Mapping ..................................................... B-18
Appendix C
C.1 TP Memory Map.......................................................................................C-2
C.2 Special Data Register ..............................................................................C-3
C.3 Special Auxiliary Relay........................................................................... C-12
C.4 Instructions applicable to TP.................................................................. C-21
C.4.1 Basic Instructions............................................................................ C-21
C.4.2 Numerical List of Instructions.......................................................... C-22
C.4.3 Additional Remarks on High-speed Instructions ............................. C-26
Appendix D
D.1 Current Consumption of a Slim PLC/an Extension Module......................D-2
D.1.1 Current supply and current consumption of a PLC (+24VDC) ..........D-2
D.1.2 Current supply and current consumption of a digital input/output
module (+24VDC).............................................................................D-2
D.1.3 Current consumption of a special input/output module (+24VDC)....D-3
D.1.4 Current consumption of a left-side high-speed special module (+24VDC)
..........................................................................................................D-3
D.1.5 Calculating the maximum current consumed by a system................D-3

v
The DVP series PLCs are listed below.
Series Model name
DVP-ES2
DVP16ES200R, DVP16ES200T, DVP24ES200R, DVP24ES200T,
DVP32ES200R, DVP32ES200T, DVP32ES211T, DVP40ES200R,
DVP40ES200T, DVP60ES200R, DVP60ES200T,
DVP40ES200RM, DVP58ES200R, DVP58ES200T
DVP-ES2-C DVP32ES200RC, DVP32ES200TC
DVP-ES2-E DVP20ES200RE, DVP20ES200TE ,DVP32ES200RE, DVP32ES200TE,DVP40ES200RE, DVP40ES200TE,
DVP60ES200RE, DVP60ES200TE
DVP-EX2 DVP20EX200R, DVP20EX200T, DVP30EX200R, DVP30EX200T
DVP-SS2 DVP14SS211R, DVP14SS211T, DVP28SS211R, DVP28SS211T
DVP-SA2 DVP12SA211R, DVP12SA211T, DVP28SA211R, DVP28SA211T
DVP-SX2 DVP20SX211R, DVP20SX211S, DVP20SX211T
DVP-SE DVP12SE11R, DVP12SE11T ,DVP26SE11R, DVP26SE11T
TP TP04P-16TP1R, TP04P-32TP1R, TP04P-22XA1R,
TP04P-21EX1R, TP70P-16TP1R, TP70P-32TP1R,
TP70P-22XA1R, TP70P-21EX1R

1-1
PLC Concepts
This chapter introduces basic and advanced concepts of ladder logic, which is the mostly
adopted programming language of PLC. Users familiar with the PLC concepts can move to
the next chapter for further programming concepts. However, for users not familiar with the
operating principles of PLC, please refer to this chapter to get a full understanding of PLC
concepts.
Chapter Contents
1.1 PLC Scan Method ..........................................................................................................1-2
1.2 Current Flow..................................................................................................................1-3
1.3 NO Contact, NC Contact................................................................................................1-3
1.4 PLC Registers and Relays.............................................................................................1-3
1.5 Ladder Logic Symbols ..................................................................................................1-4
1.5.1 Creating a PLC Ladder Program .......................................................................1-5
1.5.2 LD / LDI (Load NO contact / Load NC contact) ..................................................1-6
1.5.3 LDP / LDF (Load Rising edge trigger/ Load Falling edge trigger)........................1-6
1.5.4 AND / ANI (Connect NO contact in series / Connect NC contact in series).........1-6
1.5.5 ANDP / ANDF (Connect Rising edge in series/ Connect Falling edge in series) .1-6
1.5.6 OR / ORI (Connect NO contact in parallel / Connect NC contact in parallel).......1-6
1.5.7 ORP / ORF (Connect Rising edge in parallel/ Connect Falling edge in parallel)..1-6
1.5.8 ANB (Connect block in series)...........................................................................1-6
1.5.9 ORB (Connect block in parallel).........................................................................1-7
1.5.10 MPS / MRD / MPP (Branch instructions)............................................................1-7
1.5.11 STL (Step Ladder Programming).......................................................................1-7
1.5.12 RET (Return).....................................................................................................1-8
1.6 Conversion between Ladder Diagram and Instruction List Mode...............................1-9
1.7 Fuzzy Syntax................................................................................................................1-10
1.8 Correcting Ladder Diagram......................................................................................... 1-11
1.9 Basic Program Design Examples ...............................................................................1-13

DVP-ES2/EX2/SS2/SA2/SX2/SE&TP Operation Manual - Programming
1-2
1.1 PLC Scan Method
PLC utilizes a standard scan method when evaluating user program.
Scanning process:
Scan input status
Read the physical input status and store the data in internal
memory.
Evaluate user program
Evaluate the user program with data stored in internal memory.
Program scanning starts from up to down and left to right until
reaching the end of the program.
Refresh the outputs
Write the evaluated data to the physical outputs
X0
Y0
Y0
M0
Input X
Input terminal
Store to memory
Input signal memory
Device Memory
Read X0 status from memory
Write Y0 state into
Read Y0 state from memory
Write M0 state into
Output
Program
Input signal
Output
Output Y
Output terminal
Output latched memory
Input signal:
PLC reads the ON/OFF status of each input and
stores the status into memory before evaluating
the user program.
Once the external input status is stored into
internal memory, any change at the external
inputs will not be updated until next scan cycle
starts.
Program:
PLC executes instructions in user program from
top to down and left to right then stores the
evaluated data into internal memory. Some of this
memory is latched.
Output:
When END command is reached the program
evaluation is complete. The output memory is
transferred to the external physical outputs.
Scan time
The duration of the full scan cycle (read, evaluate, write) is called “scan time.” With more I/O or
longer program, scan time becomes longer.
Read
scan time
PLC measures its own scan time and stores the value (0.1ms) in register
D1010, minimum scan time in register D1011, and maximum scan time in
register D1012.
Measure
scan time
Scan time can also be measured by toggling an output every scan and then
measuring the pulse width on the output being toggled.
Calculate
scan time
Scan time can be calculated by adding the known time required for each
instruction in the user program. For scan time information of individual
instruction please refer to Ch3 in this manual.
Scan time exception
PLC can process certain items faster than the scan time. Some of these items interrupts and halt
the scan time to process the interrupt subroutine program. A direct I/O refresh instruction REF
allows the PLC to access I/O immediately during user program evaluation instead of waiting until
the next scan cycle.

1. PLC Concepts
1-3
1.2 Current Flow
Ladder logic follows a left to right principle. In the example below, the current flows through paths
started from either X0 or X3.
X0 Y0
X1 X2 Y0
X3 X4
Reverse Current
When a current flows from right to left, which makes a reverse current logic, an error will be
detected when compiling the program. The example below shows the reverse current flow.
X6
X0 Y0
X1 X2 Y0
X3 X4 X5
ab
1.3 NO Contact, NC Contact
NO contact
Normally Open Contact, A contact
NC Contact
Normally Closed Contact, B contact
1.4 PLC Registers and Relays
Introduction to the basic internal devices in a PLC
X
(Input Relay)
Bit memory represents the physical input points and receives external input
signals.
Device indication: Indicated as Xand numbered in octal, e.g. X0~X7,
X10~X17…X377
Y
(Output Relay)
Bit memory represents the physical output points and saves the status to be
refreshed to physical output devices.
Device indication: Indicated as Yand numbered in octal, e.g. Y0~Y7,
Y10~Y17. ..Y377
M
(Internal Relay)
Bit memory indicates PLC status.
Device indication: Indicated as Mand numbered in decimal, e.g. M0, M1,
M2…M4095
S
(Step Relay)
Bit memory indicates PLC status in Step Function Control (SFC) mode. If no
STL instruction is applied in program, step point S can be used as an internal
relay M as well as an annunciator.
Device indication: Indicated as Sand numbered in decimal, e.g. S0, S1,
S2…S1023
T
(Relay)
(Word)
(Dword)
Bit, word or double word memory used for timing and has coil, contact and
register in it. When its coil is ON and the set time is reached, the associated
contact will be energized. Every timer has its resolution (unit:
1ms/10ms/100ms).
Device indication: Indicated as Tand numbered in decimal, e.g. T0, T1,
T2…T255

DVP-ES2/EX2/SS2/SA2/SX2/SE&TP Operation Manual - Programming
1-4
C
(Counter)
(Relay)
(Word)
(Dword)
Bit, word or double word memory used for counting and has coil, contact and
register in it. The counter count once (1 pulse) when the coil goes from OFF to
ON. When the predefined counter value is reached, the associated contact will
be energized. There are 16-bit and 32-bit high-speed counters available for
users.
Device indication: Indicated as Cand numbered in decimal, e.g.
C0, C1,
C2…C255
D
(Data register)
(Word)
Word memory stores values and parameters for data operations. Every
register is able to store a word (16-bit binary value). A double word will occupy
2 consecutive data registers.
Device indication: Indicated as Dand numbered in decimal, e.g. D0, D1,
D2…D4999
E, F
(Index register)
(Word)
Word memory used as a modifier to indicate a specified device (word and
double word) by defining an offset. Index registers not used as a modifier can
be used as general purpose register.

Device indication: indicated as E0 ~ E7 and F0 ~ F7.
1.5 Ladder Logic Symbols
The following table displays list of WPLSoft symbols their description, command, and memory
registers that are able to use the symbol.
Ladder Diagram
Structure
Explanation Instruction Available Devices
NO (Normally Open)
contact / A contact
LD X, Y, M, S, T, C
NC (Normally Closed)
contact / B contact
LDI X, Y, M, S, T, C
NO contact in series AND X, Y, M, S, T, C
NC contact in series ANI X, Y, M, S, T, C
NO contact in parallel OR X, Y, M, S, T, C
NC contact in parallel ORI X, Y, M, S, T, C
Rising-edge trigger
switch
LDP X, Y, M, S, T, C
Falling-edge trigger
switch
LDF X, Y, M, S, T, C
Rising-edge trigger in
series
ANDP X, Y, M, S, T, C
Falling-edge trigger in
series
ANDF X, Y, M, S, T, C
Rising-edge trigger in
parallel ORP X, Y, M, S, T, C
Falling-edge trigger in
parallel ORF X, Y, M, S, T, C
Block in series ANB None
Block in parallel ORB None

1. PLC Concepts
1-5
Ladder Diagram
Structure
Explanation Instruction Available Devices
Multiple output branches MPS MRD
MPP None
Output coil OUT Y, M, S
S
Step ladder STL S
Basic / Application
instruction -
Basic instructions and API
instructions. Please refer to
chapter 3 Instruction Set
Inverse logic INV None
1.5.1 Creating a PLC Ladder Program
The editing of the program should start from the left side bus line to the right side bus line, and from
up to down. However, the right side bus line is omitted when editing in WPLSoft. A single row can
have maximum 11 contacts on it. If more than 11 contacts are connected, a continuous symbol “0”
will be generated automatically and the 12th contact will be placed at the start of next row. The
same input points can be used repeatedly. See the figure below:
Y1
0
0
X0 X1 X2 X3 X4 X5 X6 X7 X10 C0 C1
X11 X12 X13
When evaluating the user program, PLC scan starts from left to right and proceeds to next row
down until the PLC reaches END instruction. Output coils and basic / application instructions
belong to the output process and are placed at the right of ladder diagram. The sample program
below explains the execution order of a ladder diagram. The numbers in the black circles indicate
the execution order.
X0 X1 Y1 X4
M0
X3 M1
T0 M3
Y1
TMR T0 K10
Execution order of the sample program:
1
LD
X0
2
OR
M0
3
AND
X1
4
LD
X3
AND
M1
ORB
5
LD
Y1
AND
X4
6
LD
T0
AND
M3
ORB
7
ANB
8
OUT
Y1
TMR
T0 K10

DVP-ES2/EX2/SS2/SA2/SX2/SE&TP Operation Manual - Programming
1-6
1.5.2 LD / LDI (Load NO contact / Load NC contact)
LD or LDI starts a row or block
ANDblock ORblock
LD instruction LD instruction
1.5.3 LDP / LDF (Load Rising edge trigger/ Load Falling edge trigger)
Similar to LD instruction, LDP and LDF instructions only act at the rising edge or falling edge when
the contact is ON, as shown in the figure below.
X0
OFF ON OFF Time
Rising-edge
X0
OFF ON OFF Time
Falling-edge
1.5.4 AND / ANI (Connect NO contact in series / Connect NC contact in series)
AND (ANI) instruction connects a NO (NC) contact in series with another device or block.
AND instruction AND instruction
1.5.5 ANDP / ANDF (Connect Rising edge in series/ Connect Falling edge in series)
Similar to AND instruction, ANDP (ANDF) instruction connects rising (falling) edge triggers in series
with another device or block.
1.5.6 OR / ORI (Connect NO contact in parallel / Connect NC contact in parallel)
OR (ORI) instruction connects a NO (NC) in parallel with another device or block.
OR instruction OR instruction ORinstruction
1.5.7 ORP / ORF (Connect Rising edge in parallel/ Connect Falling edge in parallel)
Similar to OR instruction, ORP (ORF) instruction connects rising (falling) edge triggers in parallel
with another device or block
1.5.8 ANB (Connect block in series)
ANB instruction connects a block in series with another block
ANB command

1. PLC Concepts
1-7
1.5.9 ORB (Connect block in parallel)
ORB instruction connects a block in parallel with another block
ORB instruction
1.5.10 MPS / MRD / MPP (Branch instructions)
These instructions provide a method to create multiplexed output branches based on current result
stored by MPS instruction.
Branch
instruction
Branch
Symbol
Description
MPS ┬
Start of branches. Stores current result of
program evaluation. Max. 8 MPS-MPP pairs can
be applied
MRD ├
Reads the stored current result from previous
MPS
MPP └
End of branches. Pops (reads then resets) the
stored result in previous MPS
Note: When compiling ladder diagram with WPLSoft, MPS, MRD and MPP could be automatically
added to the compiled results in instruction format. However, sometimes the branch instructions
are ignored by WPLSoft if not necessary. Users programming in instruction format can enter branch
instructions as required.
Connection points of MPS, MRD and MPP:
MPS
MRD
MPP MPP
MPS
Note: Ladder diagram editor in ISPSoft does not support MPS, MRD and MPP instructions. To
achieve the same results as branch instructions, users have to connect all branches to the left
hand bus bar.
WPLSoft
ISPSoft
1.5.11 STL (Step Ladder Programming)
STL programming uses step points, e.g. S0 S21, S22, which allow users to program in a clearer
and understandable way as drawing a flow chart. The program will proceed to next step only if the

DVP-ES2/EX2/SS2/SA2/SX2/SE&TP Operation Manual - Programming
1-8
previous step is completed, therefore it forms a sequential control process similar to SFC
(Sequential Function Chart) mode. The STL sequence can be converted into a PLC ladder diagram
which is called “step ladder diagram” as below.
e
S0
S21
S22
M1002
initial
pulse
M1002 SET S0
SET S21
S
S0
SET S22
S
S21
S
S22 S0
RET
1.5.12 RET (Return)
RET instruction has to be placed at the end of sequential control process to indicate the completion
of STLflow.
e
S
S20
RET
e
S
S20
RET
Note: Always connect RET instruction immediately after the last step point indicated as the above
diagram otherwise program error may occur.

1. PLC Concepts
1-9
1.6 Conversion between Ladder Diagram and Instruction List Mode
Ladder Diagram
X0 X2 X1
X1
M1
C0 Y0
SET S0
M2 Y0
M0
X10 Y10
SET S10
S0
S
X11 Y11
SET S11
S10
S
SET S12
SET S13
X12 Y12
SET S20
S11
S
X13 S0
RET
S20
SS12
SS13
S
X0 CNT C0 K10
X1 M0
C0
X1
M2
RST C0
M1
M2
END
Instruction
LD X0
OR X1
LD X2
OR M0
ORI M1
ANB
LD M2
AND Y0
ORB
AN I X1
OUT Y0
AND C0
SET S0
STL S0
LD X10
OUT Y10
SET S10
STL S10
LD X11
OUT Y11
SET S11
SET S12
SET S13
STL S11
LD X12
OUT Y12
SET S20
STL S20
STL S12
STL S13
LD X13
OUT S0
RET
LD X0
CNT C0K10
LD C0
MPS
AND X1
OUT M0
MRD
AN I X1
OUT M1
MPP
AN I M2
OUT M2
END
OR
block
ANI
Multiple
outputs
RST C0
OR
block
Block in series
AND
block
Block in parallel The output
continues
basedon
statusof
Start of step ladder
Output Y10 and
transfer of step point
Read S10 status
Output Y11 and
transfer of step points
Read S11 status
S11 operates with X12
Output Y12 and
transfer of step points
Convergence of
multiple status Endofstep
ladder
Read X13 status and
transfer of step point
Return
Read C0
Multiple
outputs
End of program
S0 status operates with X10

DVP-ES2/EX2/SS2/SA2/SX2/SE&TP Operation Manual - Programming
1-10
1.7 Fuzzy Syntax
Generally, the ladder diagram programming is conducted according to the “up to down and left to
right” principle. However, some programming methods not following this principle still perform the
same control results. Here are some examples explaining this kind of “fuzzy syntax.”
Example 1:
X0 X2 X4
X5X3X1
Better method
OK method
LD
X0
LD
X0
OR
X1
OR
X1
LD
X2
LD
X2
OR
X3
OR
X3
ANB
LD
X4
LD
X4
OR
X5
OR
X5
ANB
ANB
ANB
The two instruction programs can be converted into the same ladder diagram. The difference
between Better and OK method is the ANB operation conducted by MPU. ANB instruction cannot
be used continuously for more than 8 times. If more than 8 ANB instructions are used continuously,
program error will occur. Therefore, apply ANB instruction after a block is made is the better
method to prevent the possible errors. In addition, it’s also the more logical and clearer
programming method for general users.
Example 2:
X0
X1
X2
X3
Good method
Bad method
LD
X0
LD
X0
OR
X1
LD
X1
OR
X2
LD
X2
OR
X3
LD
X3
ORB
ORB
ORB
The difference between Good and Bad method is very clear. With longer program code, the
required MPU operation memory increases in the Bad method. To sum up, following the general
principle and applying good / better method when editing programs prevents possible errors and
improves program execution speed as well.
Common Programming Errors
PLC processes the diagram program from up to down and left to right. When editing ladder
diagram users should adopt this principle as well otherwise an error would be detected by WPLSoft
when compiling user program. Common program errors are listed below:
OR operation upward is not allowed.
Reverse current
“Reverse current” exists.
Output should be connected on top of the circuit.