Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 135
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- Tabla de contenidos
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
Half-Duplex Protocol
Chapter 11
118
Figure 11.2
Slave
T
ransceiver
Software
Software
Hardware
SOURCE
Network
Packet
Network
Packet
OK
Full
TRANSMITTER
RECEIVER
SINK
10052-I
SINK
Network
Packet
MASTER
SLAVE
SOURCE
Network
Packet
Full
OK
Link
To Other Slaves
Message Characteristics
Half–duplex protocol places the following restrictions on the network
packet that is submitted to the link layer for transfer.
The size of a valid network packet is 6 bytes minimum, and 250 bytes
maximum.
The first byte of a network packet must be the station number of the
receiver station (see DST in chapter 12). The receiver ignores
messages that do not contain the correct station number.
As part of the duplicate message detection algorithm, the transceiver
checks the second, third, fifth, and sixth bytes of each network packet.
At least one of these bytes of the current network packet must differ
from the corresponding byte of the previous network packet in order for
the transceiver to act upon the current network packet. Otherwise, the
transceiver assumes that the current network packet is a retransmission
of the previous network packet, so it discards the current network
packet.
Master Polling Responsibilities
You may vary the master polling algorithm, depending on how much
activity you expect on your network.
- 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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