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DVP-PLC Application Manual:

Programming

Table of Contents

• Foreword: Background and Functions of PLC 1- Chapter 1 Basic Principles of PLC Ladder Diagram
• 1.1 The Working Principles of Ladder Diagram 1-
• 1.2 Differences Between Traditional Ladder Diagram and PLC Ladder Diagram 1-
• 1.3 Edition Explanation of Ladder Diagram 1-
• 1.4 How to Edit Ladder Diagram 1-
• 1.5 The Conversion of PLC Command and Each Diagram Structure 1-
• 1.6 Simplified Ladder Diagram 1-
• 1.7 Basic Program Designing Examples 1-
• 2.1 All Devices in DVP-PLC.................................................................................... 2- Chapter 2 Functions of Devices in DVP-PLC
• 2.2 Values, Constants [K] / [H] 2-
• 2.3 Numbering and Functions of External Input/Output Contacts [X] / [Y].................. 2-
• 2.4 Numbering and Functions of Auxiliary Relays [M] 2-
• 2.5 Numbering and Functions of Step Relays [S] 2-
• 2.6 Numbering and Functions of Timers [T] 2-
• 2.7 Numbering and Functions of Counters [C] 2-
• 2.8 Numbering and Functions of Registers [D], [E], [F] 2-
  • 2.8.1 Data register [D] 2-
  • 2.8.2 Index Register [E], [F] 2-
  • 2.8.3 Functions and Features of File Registers 2-
• 2.9 Pointer [N], Pointer [P], Interruption Pointer [I] 2-
• 2.10 Special Auxiliary Relays and Special Data Registers 2-
• 2.11 Functions of Special Auxiliary Relays and Special Registers 2-
• 2.12 Communication Addresses of Devices in DVP Series PLC 2-
• 2.13 Error Codes 2-
• 3.1 Basic Instructions and Step Ladder Instructions 3- Chapter 3 Basic Instructions
• 3.2 Explanations on Basic Instructions 3-
  • 4.1 Step Ladder Instructions [STL], [RET] 4- Chapter 4 Step Ladder Instructions
  • 4.2 Sequential Function Chart (SFC) 4-
  • 4.3 How does a Step Ladder Instruction Work? 4-
  • 4.4 Things to Note for Designing a Step Ladder Program 4-
  • 4.5 Types of Sequences 4-
  • 4.6 IST Instruction 4-
  • 5.1 List of Instructions 5- Chapter 5 Categories & Use of Application Instructions
  • 5.2 Composition of Application Instruction 5-
  • 5.3 Handling of Numeric Values 5-
  • 5.4 E, F Index Register Modification 5-
  • 5.5 Instruction Index 5-
• Chapter 6 Application Instructions API 00- - ● （ API00 ~ 09） Loop Control 6- - ● （ API10 ~ 19） Transmission Comparison 6- - ● （ API20 ~ 29） Four Arithmetic Operation 6- - ● （ API30 ~ 39） Rotation & Displacement 6- - ● （ API40 ~ 49） Data Processing 6-
• Chapter 7 Application Instructions API 50- - ● （ API50 ~ 59） High Speed Processing 7- - ● （ API60 ~ 69） Handy Instructions 7- - ● （ API70 ~ 79） Display of External Settings 7- - ● （ API80 ~ 88） Serial I/O 7-
• Chapter 8 Application Instructions API 100- - ● （ API100 ~ 109） Communication 8- - ● （ API110 ~ 119） Floating Point Operation 8- - ● （ API120 ~ 129） Floating Point Operation 8- - ● （ API130 ~ 139） Floating Point Operation 8- - ● （ API143 ~ 149） Others 8-
• Chapter 9 Application Instructions API 150- - ● （ API150 ~ 154） Others 9- - ● （ API155 ~ 159） Position Control 9- - ● （ API160 ~ 169） Real Time Calendar 9- i i i - ● （ API170 ~ 179） Gray Code Conversion/Floating Point Operation 9- - ● （ API180 ~ 189） Matrix 9- - ● （ API190 ~ 199） Positioning Instruction 9-
• Chapter 10 Application Instructions API 202- - ● （ API202 ~ 207） Others. 10- - ● （ API215 ~ 223） Contact Type Logic Operation Instruction. 10- - ● （ API224 ~ 246） Contact Type Comparison Instruction 10- - ● （ API266 ~ 274）W ord Device Bit Instruction 10- - ● （ API275 ~ 313） Floating-point Contact Type Comparison Instruction............. 10-
  • 11.1 Appendix A: Table for Self-detecting Abnormality 11- Chapter 11 Appendix
  • 11.2 Appendix B: MPU Terminal Layout 11-
  • 11.3 Appendix C: Terminal Layout for Digital I/O Modules 11-
  • 11.4 Appendix D: Difference between EH2 and EH3 11-
  • 11.5 Appendix E: Current Consumption of a Slim PLC/an Extension Module 11-
  • 11- 11.6 Appendix F: Current Consumption of an EH2/EH3 Series PLC/an Extension Module
  • 11.7 Appendix G: Using Ethernet Communication 11-
  • 11.8 Appendix H: Revision History 11-

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The models that every series includes are as follows.

Series Model name

DVP-ES

DVP14ES00R2, DVP14ES00T2, DVP14ES01R2, DVP14ES01T2, DVP24ES00R,

DVP24ES00R2, DVP24ES00T2, DVP24ES01R2, DVP24ES01T2, DVP24ES11R2,

DVP30ES00R2, DVP30ES00T2, DVP32ES00R, DVP32ES00R2, DVP32ES00T2,

DVP32ES01R2, DVP32ES01T2, DVP40ES00R2, DVP40ES00T2, DVP60ES00R2,

DVP60ES00T

DVP10EC00R3, DVP10EC00T3, DVP14EC00R3, DVP14EC00T3, DVP16EC00R3,

DVP16EC00T3, DVP20EC00R3, DVP20EC00T3, DVP24EC00R3, DVP24EC00T3,

DVP30EC00R3, DVP30EC00T3, DVP32EC00R3, DVP32EC00T3, DVP40EC00R3,

DVP40EC00T3, DVP60EC00R3, DVP60EC00T

DVP-EX DVP20EX00R2, DVP20EX00T2, DVP20EX11R

DVP-SS DVP14SS11R2, DVP14SS11T

DVP-SA DVP12SA11R, DVP12SA11T

DVP-SX DVP10SX11R, DVP10SX11T

DVP-SC DVP12SC11T

DVP-EH

DVP16EH00R2, DVP16EH00T2, DVP20EH00R2, DVP20EH00T2, DVP32EH00M2,

DVP32EH00R2, DVP32EH00T2, DVP40EH00R2, DVP40EH00T2, DVP48EH00R2,

DVP48EH00T2, DVP60EH00T2, DVP64EH00R2, DVP64EH00T2, DVP80EH00R2,

DVP80EH00T2, DVP32EH00R2-L, DVP32EH00T2-L

DVP-SV DVP28SV11R, DVP28SV11T

DVP-EH

DVP16EH00R3, DVP16EH00T3, DVP20EH00R3, DVP20EH00T3, DVP32EH00M3,

DVP32EH00R3, DVP32EH00T3, DVP40EH00R3, DVP40EH00T3, DVP48EH00R3,

DVP48EH00T3, DVP60EH00T3, DVP64EH00R3, DVP64EH00T3, DVP80EH00R3,

DVP80EH00T3, DVP32EH00R3-L, DVP32EH00T3-L

DVP-SV2 DVP28SV11R2, DVP28SV11T

will be open loop (Off), so Y0 will be Off. When X0 is pressed, the contact will be On, so Y0 will be On. Row 2: Using a normally closed (NC) switch X1 (“B” switch or “B” contact). When X1 is not pressed, the contact will be On, so Y1 will be On. When X1 is pressed, the contact will be open loop (Off), so Y1 will be Off. Row 3: The combination logic of more than one input devices. Output Y2 will be On when X2 is not pressed or X3 and X4 are pressed.

2. Sequential Logic Sequential logic is a circuit with "draw back” structure, i.e. the output result of the circuit will be drawn back as an input criterion. Therefore, under the same input criteria, different previous status or action sequence will follow by different output results. Examples of traditional ladder diagram and PLC ladder diagram for sequential logic: Traditional Ladder Diagram PLC Ladder Diagram X5 Y Y

X Y X Y

X

When the circuit is first connected to the power, though X6 is On, X5 is Off, so Y3 will be Off. After X5 is pressed, Y3 will be On. Once Y3 is On, even X5 is released (Off), Y3 can still keep its action because of the draw back (i.e. the self-retained circuit). The actions are illustrated in the table below. Device status Action sequence

X5 X6 Y

1 No action No action Off 2 Action No action On 3 No action No action On 4 No action Action Off 5 No action No action Off

From the table above, we can see that in different sequence, the same input status can result in different output results. For example, switch X5 and X6 of action sequence 1 and 3 do not act, but Y3 is Off in sequence 1 and On in sequence 3. Y3 output status will then be drawn back as input (the so-called “draw back”), making the circuit being able to perform sequential control, which is the main feature of the ladder diagram circuit. Here we only explain contact A, contact B and the output coil. Other devices are applicable to the same method. See Chapter 3 “Basic instructions” for more details.

1.2 Differences Between Traditional Ladder Diagram and PLC Ladder Diagram

Though the principles of traditional ladder diagram and PLC ladder diagram are the same, in fact, PLC adopts microcomputer to simulate the motions of the traditional ladder diagram, i.e. scan-check status of all the input devices and output coil and calculate to generate the same output results as those from the traditional ladder diagram based on the logics of the ladder diagram. Due to that there is only one microcomputer, we can only check the program of the ladder diagram one by one and calculate the output results according to the program and the I/O status before the

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cyclic process of sending the results to the output interface  re-reading of the input status  calculation  output. The time spent in the cyclic process is called the “scan time” and the time can be longer with the expansion of the program. The scan time can cause delay from the input detection to output response of the PLC. The longer the delay, the bigger the error is to the control. The control may even be out of control. In this case, you have to choose a PLC with faster scan speed. Therefore, the scan speed is an important specification requirement in a PLC. Owing to the advancement in microcomputer and ASIC (IC for special purpose), there has been great improvement in the scan speed of PLC nowadays. See the figure below for the scan of the PLC ladder diagram program.

The output result is calculated based on the ladder diagram. (The result has not yet sent to the external output point, but the internal device will perform an immediate output.)

Y

X0 X Start Y

M100 X Y

X : : X100 M Y End

Send the result to the output point

Read input status from outside

Executing in cycles

Besides the difference in the scan time, PLC ladder and traditional ladder diagram also differ in “reverse current”. For example, in the traditional ladder diagram illustrated below, when X0, X1, X4 and X6 are On and others are Off, Y output on the circuit will be On as the dotted line goes. However, the PLC ladder diagram program is scanned from up to down and left to right. Under the same input circumstances, the PLC ladder diagram editing tool WPLSoft will be able to detect the errors occurring in the ladder diagram. Reverse current of traditional ladder diagram

X

X0 X1^ X X3 (^) a X4^ bX

Y

Reverse current of PLC ladder diagram

X

X Y

X1 X2 Y

X3 (^) a X4 (^) bX

Error detected in the third row

1.3 How to Edit Ladder Diagram

Ladder diagram is a diagram language frequently applied in automation. The ladder diagram is composed of the symbols of electric control circuit. The completion of the ladder diagram by the ladder diagram editor is the completion

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Device Functions

Internal relay

The internal relay does not have connection with the external. It is an auxiliary relay inside the PLC with the functions same as those of the auxiliary (middle) relay in the electric control circuit. Every internal relay corresponds to a basic internal storage unit and can be driven by the contacts of the input relay, contacts of the output relay and the contacts of other internal devices. There are no limitations on the times of using the contacts of the internal relay and there will be no output from the internal relay, but from the output point.  Device indication: M0, M1, …, M4095 are indicated as M and numbered in decimal form.

Step

DVP series PLC offers a step-type control program input method. STL instruction controls the transfer of step S, which makes it easy for the writing of the control program. If you do not use any step program in the control program, step S can be used as an internal relay M as well as an alarm point.  Device indication: S0, S1, …S1023 are indicated as S and numbered in decimal form.

Timer

The timer is used for timing and has coil, contact and register in it. When the coil is On and the estimated time is reached, its contact will be enabled (contact A closed, contact B open). Every timer has its fixed timing period (unit: 1ms/10ms/100ms). Once the coil is Off, the contact iwlwl be disabled (contact A open, contact B closed) and the present value on the timer will become “0”.  Device indication: T0, T1, …, T255 are indicated as T and numbered in decimal form. Different No. refers to different timing period.

Counter

The counter is used for counting. Before using the counter, you have to give the counter a set value (i.e. the number of pulses for counting). There are coil, contact and registers in the counter. When the coil goes from Off to On, the counter will regard it as an input of 1 pulse and the present value on the counter will plus “1”. We offer 16-bit and 32-bit high-speed counters for our users.  Device indication: C0, C1, …, C255 are indicated as C and numbered in decimal form.

Data register

Data processing and value operations always occur when the PLC conducts all kinds of sequential control, timing and counting. The data register is used for storing the values or all kinds of parameters. Every register is able to store a word (16-bit binary value). Double words will occupy 2 adjacent data registers.  Device indication: D0, D1, …, D11999 are indicated as D and numbered in decimal form.

File register

The file register is used for storing the data or all kinds of parameters when the data registers required for processing the data and value operations are insufficient. Every file register is able to store a 16-bit word. Double words will occupy 2 adjacent file registers. In SA/SX/SC series MPU, there are 1,600 file registers. In EH2/SV/EH3/SV2 series MPU, there are 10,000 file registers. There is not an actual device No. for a file register. The reading and writing of file registers should be executed by instructions API 148 MEMR, API 149 MEMW, or through the peripheral device HPP02 and WPLSoft.  Device indication: K0 ~ K9,999, numbered in decimal form.

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Device Functions

Index register

E and F index registers are 16-bit data registers as other data registers. They can be read and written and can be used in word devices, bit devices or as a constant for index indication.  Device indication: E0 ~ E7, F0 ~ F7 are indicated as E and F and numbered in decimal form.

The structure of a ladder diagram: Structure Explanation Instruction Devices Used

Normally open, contact A LD X, Y, M, S, T, C

Normally closed, contact B LDI X, Y, M, S, T, C

Normally open in series connection

AND X, Y, M, S, T, C

Normally closed in series connection

ANI X, Y, M, S, T, C

Normally open in parallel connection

OR X, Y, M, S, T, C

Normally closed in parallel connection

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 connection

ANDP X, Y, M, S, T, C

Falling-edge trigger in series connection

ANDF X, Y, M, S, T, C

Rising-edge trigger in parallel connection

ORP X, Y, M, S, T, C

Falling-edge trigger in parallel connection

ORF X, Y, M, S, T, C

Block in series connection ANB -

Block in parallel connection ORB -

Network: A complete block network is composed of devices and all kinds of blocks. The blocks or devices connectable by a vertical line or continuous line belong to the same network.

An independent network

Network 1

Network 2

An incomplete network

1.4 How to Edit a PLC Ladder Diagram

The editing of the program should start from the left power line and ends at the right power line, a row after another. The drawing of the right power line will be omitted if edited from WPLSoft. A row can have maximum 11 contacts on it. If 11 is not enough, you can continuously connect more devices and the continuous number will be generated automatically. The same input points can be used repeatedly. See the figure below: X0 X1 X2 X3 X4 X

Y

X11 X12 X

X6 X7 X10 C0 C 00000 00000 Continuous number

The operation of the ladder diagram program is scanning from top left to bottom right. The coil and the operation frame of the application instruction belong to the output side in the program and are placed in the right if the ladder diagram. Take the figure below for example, we will step by step explain the process of a ladder diagram. The numbers in the black circles indicate the order.

X0 X1 Y1 X

M X3 M

T0 (^) M

Y TMR T0 K

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The order of the instructions: 1 LD X 2 OR M 3 AND X 4 LD X AND M ORB 5 LD Y AND X 6 LD T AND M ORB 7 ANB 8 OUT Y TMR T0 K

Explanations on the basic structures in the ladder diagram:

1. LD (LDI) instruction: Given in the start of a block.

AND block OR block

LD instruction LD instruction

The structure of LDP and LDF instructions are the same as that of LD instruction, and the two only differ in their actions. LDP and LDF instructions only act at the rising edge or falling edge when the contact is On, as shown in the figure below.

X OFF (^) ON (^) OFF

Time

Falling edge X OFF (^) ON OFF

Time

Rising edge

2. AND (ANI) instruction: A single device connects to another single device or a block in series AND instruction AND instruction

The structure of ANDP and ANDF instructions are the same. ANDP and ANDF instructions only act at the rising edge or falling edge.

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MPP is recognized as “└”. Using the method given above for the analysis cannot be wrong. However, sometimes the compiling program will ignore the same output status, as shown in the figure.

MPS

MRD

MPP MPP

MPS

7. STL instruction: Used for designing the syntax of the sequential function chart (SFC). STL instruction allows the program designer a clearer and readable picture of the sequence of the program as when they draw a sequence chart. From the figure below, we can see clearly the sequence to be planned. When the step S moves to the next step, the original S will be “Off". Such a sequence can then be converted into a PLC ladder diagram and called “step ladder diagram”. M

S

SET S S SET S SET (^) S

S S S

RET

S S

M

8. RET instruction: Placed after the completed step ladder diagram. RET also has be placed after STL instruction. See the example below.

RET

S S

RET

S S

X

X

See step ladder instructions [STL], [RET] in Ch. 4 for the structure of the ladder diagram.

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1.5 The Conversion of PLC Command and Each Diagram Structure

Ladder Diagram

X0 X2 X X M

C

Y SET S

M2 Y

M

X Y SET S

S S

X Y SET S

S S

SET S SET S

X Y SET S

S11 S

X S RET

S S S S S S

X CNT C0 K X M C X M

RST C

M M

END

LD X

OR X

LD X

OR M

ORI M

ANB

LD M

AND Y

ORB

AN I X

OUT Y

AND C

SET S

STL S

LD X

OUT Y

SET S

STL S

LD X

OUT Y

SET S

SET S

SET S

STL S

LD X

OUT Y

SET S

STL S

STL S

STL S

LD X

OUT S

RET

LD X

CNT C0 K

LD C

MPS

AND X

OUT M

MRD

AN I X

OUT M

MPP

AN I M

OUT M

END

OR block

ANI Multiple outputs

RST C

OR block Seriesconnection blcok AND block Parallel connection block The output will continue following the status of

Step ladder Start Status working item and step point transfer Withdraw S10 status Withdraw X11 status Status working item and step point transfer

Withdraw S11 status Withdraw X12 status Status working item and step point transfer Bifurcation convergence Status working item End of step ladder and step point transfer Return

Read C

Multiple outputs

End of program

Status S0 and X10 operation

 Fuzzy Syntax The correct ladder diagram analysis and combination should be conducted from up to down and left to right. However,

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omitted), from left to right horizontally, one row after another from up to down. See bellows for the frequently seen incorrect diagrams:

OR operation upward is not allowed.

Re ver se fl ow

“Reverse flow” exists in the signal circuit from the beginning of input to output.

The up-right corner should output first.

Combining or editing should be done from the up-left to the bottom-right. The dotted-lined area should be moved up.

Parallel operation with empty device is not allowed.

Empty device cannot do operations with other devices.

No device in the middle block.

Devices and blocks in series should be horizontally aligned.

Label P0 should be in the first row of a complete network.

Blocks connected in series should be aligned with the upmost horizontal line.

1.6 Simplified Ladder Diagram

 When a series block is connected to a parallel block in series, place the block in the front to omit ANB instruction. Ladder diagram complied into instruction LD X LD X OR X

X0 X X

 ANB Ladder diagram complied into instruction LD X OR X

X1 X X AND X

 When a single device is connected to a block in parallel, place the block on top to omit ORB instruction. Ladder diagram complied into instruction LD T LD X AND X

T X1 (^) X

 ORB

Ladder diagram complied into instruction LD X T0 AND X

X1 X

OR T

 In diagram (a), the block on top is shorter than the block in the bottom, we can switch the position of the two blocks to achieve the same logic. Due to that diagram (a) is illegal, there is a “reverse flow” in it. Ladder diagram complied into instruction LD X OR X AND X LD X AND X

X X1 X X3 X (a)  ORB Ladder diagram complied into instruction LD X AND X LD X OR X AND X

X

X1 X

X3 X

(b) ORB

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