Delta-electronics Programmable Logic Controller DVP-PLC Manual de usuario Pagina 7
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1 Basic Principles of PLC Ladder Diagram
DVP-PLC Application Manual
1-3
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.)
Y0
X0 X1
Y0
Start
M100
X3
Y1
X10
:
:
X100 M505
Y126
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,
Y0 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
X6
X0
X1 X2
X3
X4
X5
a
b
Y0
Reverse current of PLC ladder diagram
X6
X0
Y0
X1
X2
Y0
X3
X4 X5
a
b
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
of the PLC program design. The control flow illustrated by diagram makes the flow more straightforward and
acceptable for the technicians of who are familiar with the electric control circuit. Many basic symbols and actions in
- 【Programming】 2
- Table of Contents 2
- Combination line for block 1 11
- Separation line for block 2 11
- Combination line for block 2 11
- Network 1 12
- Network 2 12
- AND instructio 13
- AND instruction 13
- ORB instruction 14
- Parallel 16
- X0 X2 X4 17
- Reverse fl ow 18
- X0 X1 X2 20
- X3 X4 X5 20
- X6 X7 X5 20
- 100 seconds 24
- Vertical 25
- Horizontal 25
- T2TMR K50 27
- ES/EX/SS series MPU: 29
- SA/SX/SC series MPU: 30
- Interruption 31
- EH/EH2/SV series MPU: 32
- TMR T0 K100 41
- Output reached 47
- Counting up 48
- Counting down 48
- - - R/W NO 0 87
- - - R/W NO 1 88
- - - R/W NO 6 88
- Data Backup Memory 98
- MOV K0 D1020 102
- SPD X1 K1000 D0 105
- H86 D1120 107
- SET M1120 107
- HA0 D1109 108
- SET M1136 108
- 2,606 8,606 11,213 114
- Frequency (Hz) 114
- Time (ms) 114
- (Figure 1) 117
- (Figure 2) 117
- (50,000, 50,000) 118
- 10 sections 118
- (Figure 4) 119
- (Figure 7) 120
- (Figure 8) 121
- MODEM MODEM 132
- DVP-PLC Application Manual 146
- 2.12 Error Codes 153
- 3 Basic Instructions 155
- 4 Step Ladder Instructions 171
- 5.1 List of Instructions 193
- Applicable to STEPS 194
- ES SA EH 16-bit 32-bit 194
- ES SA EH 16-bit 32-bit 195
- Positioning Instruction 196
- Mnemonic 196
- Category 196
- 16-bit 32-bit 196
- Function 196
- PULSE 16-bit 32-bit 198
- D10 D20DMOV 199
- D10 D12MOV 200
- DSW X10 Y10 D0 K0 201
- BIN K2X4 D0 204
- .121 ××− 205
- MOV K20E0 D10F0 206
- E0 = 8 F0 = 14 206
- 20 + 8 = 28 10 + 14 = 24 206
- 5.5 Instruction Index 208
- Mnemonic Applicable to 209
- Instruction 209
- CJ, CJP: 3 steps 213
- CJ instruction 214
- ES/EX/SS SA/SX/SC EH/SV 224
- PULSE 16-bit 32-bit 224
- STEP0 END(FEND) 226
- Program Example 2: 228
- ES/EX/SS SA/SX/SC EH/SV 230
- BCD D10 K1Y0 241
- DD D0 D10 D20 244
- DADD D30 D40 D50 244
- Remarks: 245
- SUB D0 D10 D20 246
- DSUB D30 D40 D50 246
- MUL D0 D10 D20 248
- MUL D0 D10 K8M0 248
- DIV D0 D10 D20 250
- D0 D10 K4Y0 250
- Right-shifting for 2 digits 265
- FMOV K0 D10 K5 270
- 0000 00011 100 0000 K3 275
- ANS T10 K50 S999 278
- ANS T10 K20 S910 279
- SQR D0 D12 281
- MTR X40 Y40 M10 K2 287
- DVP-PLC APPLICATION MANUAL 288
- DCNT C235 K1000 289
- DHSCS K100 C235 Y10 289
- On immediately 289
- U/D FLAG 296
- DHSZ D0 K4 C251 M1150 303
- PLSY K1000 K200 Y0 311
- Y0 output 312
- PLSY K1000 K1000 Y0 315
- Y1 output 317
- T=2,000ms 317
- PWM K1000 K2000 Y1 317
- PLSR K1000 D10 K3000 Y0 320
- IST X10 S20 S60 323
- IST X10 S20 S80 324
- Auto Operation Modes 326
- Ladder Diagram: 327
- SER D10 D0 D50 K10 329
- INCD D100 C10 M10 K5 332
- CNT C10 K100 332
- SORT D0 K5 K5 D50 D100 341
- F E D C B A 346
- The first group 352
- The second group 352
- CR #10 CR #9 361
- Designated CR number 361
- CCD D0 D100 K6 386
- () () () 394
- Diagram 1: + 4 = K0 ~ K2 395
- them in D1050 ~ D1055 404
- LRC D101 K12 D113 420
- CRC D100 K6 D106 422
- Radian 428
- DDEG D0 D10 429
- D 11 D 10 446
- SIN value 446
- (binary floating point) 446
- SET M1018 448
- TAN value 450
- S: Entered data (sine value) 451
- R: ASIN value (radian) 451
- FTC D0 D1 D100 D150 460
- D0 K50 Y0 466
- High Byte Low Byte 468
- DSWAPP D10 468
- MEMR K10 D2000 K100 469
- PWD X10 D0 482
- ABS absolute position 487
- Time-out : 5 sec 487
- Ex: Mitsubishi MR-J2- A 488
- ZRN K20000 K1000 492
- PLSV K20000 Y0 Y5 495
- DRVI K20000 K2000 Y0 Y5 497
- Current 498
- 1. K0: Y0 output 500
- 4. K3: Y1 output 500
- Example: 503
- The last deceleration segment 504
- (D1340) Min: 10Hz 504
- Mitsubishi servo drive 507
- 05:20:30 19:11:15 10:09:15 514
- SET M1016 516
- 30 seconds correction 518
- MOR D0 D10 D20 K3 533
- MCMPP D0 D10 D20K3 538
- MBSP D0 D20 K3 544
- MBRP D0 D20 K3 546
- Figure 5 Figure 6 554
- Figure 3 559
- Figure 4 559
- Acceleration 568
- Idling time 568
- K-168 K534 D10 576
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