Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 126
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Valorado. / 5. Basado en revisión del cliente
Full-Duplex Protocol
Chapter 10
1022
If you were to connect a line monitor to the wires between station A and
B, and only the A to B subsystem were active, you could observe the
following:
Examples
Normal Message
Path 1: DLE STX xxxDLE ETX BCC DLE STXxxxxDLE ETX BCC
Path 2: DLE ACK DLE ACK
Message with parity or BCC error and recovery
Path 1: DLE STXxx???xxDLE ETX BCC DLE STXxxxxDLE ETX BCC
Path 2: DLE NAK DLE ACK
Message with ETX destroyed
Path 1: DLE STXxxxxx????[timeout] DLE ENQ DLE STXxxxxDLE ETX BCC
Path 2: DLE NAK DLE ACK
Good message but ACK destroyed
Path 1: DLE STXxxxDLE ETX BCC [timeout] DLE ENQ DLE STXxxx etc.
Path 2: DL???CK DLE ACK
Messages being sent in both directions
Path 1: DLE STXxxxDLE ETX BCC DLE STXxxxxDLE ETX BCC DLE STX
Path 2: DLE ACK DLE ACK
Path 3: DLE STXxxx xxxxDLE ETX BCC DLE STX
Path 4: DLE ACK
Combined –
Circuit AB:DLE STXxxxDLE ETX BCC DLE STXxxxxDLE ETX BCC DLE ACK DLE STX
Circuit BA: DLE STXxxxDLE ACKxxxxDLE ETX BCC DLE ACK DLE STX
embedded response
ACK on AB delayed slightly because ETX BCC are indivisible
- User Manual 1
- Table of Contents 2
- Table of Contentsii 3
- Table of Contents iii 4
- Figure 1.1 9
- Communication 9
- Introduction 11
- Chapter 1 11
- Figure 1.3 12
- Modem Application 12
- Installation 13
- Figure 2.1 14
- Figure 2.2 15
- Switches 15
- Figure 2.3 18
- Two PLC-3 Controllers 18
- Chapter 2 19
- Figure 2.7 22
- Figure 2.10 29
- Connection 29
- Data Highway Communication 46
- #H024$B12:37 = 15 48
- $B45:21 = $I12:33 51
- Chapter 3 52
- Addressing Rules and Examples 57
- 10017-I 58
- Figure 4.4 61
- $N 15 : 0, 20 64
- @FILE_A:16/8 66
- $B1:5/012 66
- #H024$015,4 67
- #H015$0121/010 68
- #H 020 $ B 15:9 68
- #H 020 @ WORD_9 68
- Chapter 5 77
- Message Procedure Commands 79
- NUM = 0 86
- LOOP: $B50:(NUM) = NUM 86
- NUM = (NUM +1) 86
- $D:12 = TO_BCD (27) 88
- COUNT = FROM_BCD ($D:12) 88
- Figure 6.3 89
- for Comments 89
- Error Reporting 90
- Chapter 7 92
- Programming Examples 95
- Chapter 8 96
- Computer to PC Communication 100
- Figure 9.1 102
- Computer to PC Communiation 103
- Chapter 9 103
- Full-Duplex Protocol 105
- Figure 10.1 108
- Chapter 10 111
- Figure 10.7 114
- Transmitter 114
- for Full-Duplex Protocol 114
- 110046–I 121
- Figure 10.12 124
- Message T 124
- Half-Duplex Protocol 128
- Chapter 11 132
- Figure 11.4 140
- Figure 11.8 143
- with Message Returned 143
- Figure 11.9 144
- Duplicate 144
- Figure 11.11 146
- Sink Full, Case 2 146
- Figure 12.2 150
- Message Packet Format 150
- Figure 12.3 151
- Reply Message Packet Format 151
- Figure 12.4 158
- PLC/PLC-2 158
- Data Table Byte Addressing 158
- Chapter 12 160
- 0 0 0 0 0 0 0 0 161
- A8 A7 A6 A5 A4 A3 A2 A1 161
- Message Formats 163
- Appendix A 165
- Figure A.2 166
- Reply Format: 173
- Error Codes 193
- 1773-KA Module 196
- Appendix B 196
- Local and Reply Error Codes 196
- Diagnostic Counter Block 209
- Diagnostic Port Counters 210
- Appendix C 210
- Modem Port Counters 210
- Detailed Flowcharts 211
- Appendix D 212
- Figure D.11 220
- Figure D.20 227
- SLEEP and W 227
- AKEUP Interaction 227
- Figure D.21 228
- Routine 228
- Worldwide representation 239
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