Manual

Trusted
TM
Communication Interface T8151B
Issue 21 Apr 10 PD-T8151B 5
3.5.9. Validation Tool............................................................................................................................35
3.6. Modbus Master Polling Sequence..............................................................................................36
3.7. Modbus Master Redundant Configurations................................................................................38
3.8. Modbus Compatibility .................................................................................................................39
3.8.1. Modbus Write Protection Compatibility ......................................................................................39
3.9. Modbus Master Timing and Throughput Rules ..........................................................................40
3.10. Modbus Slave Timing and Throughput Rules ............................................................................41
3.11. I/O Complex Equipment Definition ‘TCI’.....................................................................................42
4. Operation....................................................................................................................................43
4.1. Front Panel.................................................................................................................................43
4.2. Module Status LEDs...................................................................................................................44
5. Fault Finding and Maintenance ..................................................................................................45
5.1. Fault Reporting...........................................................................................................................45
5.2. Module Faults.............................................................................................................................45
5.3. Module Replacement .................................................................................................................45
5.4. Command Line Diagnostics .......................................................................................................46
5.4.1. Top-level commands..................................................................................................................46
5.4.2. Task commands.........................................................................................................................46
5.4.3. Heirarchical prompts ..................................................................................................................47
5.4.4. Trace diagnostics .......................................................................................................................47
6. Communications Wiring .............................................................................................................49
6.1. RS232 Communications Standard.............................................................................................49
6.1.1. Maximum Cable Length .............................................................................................................51
6.2. RS485 Communications Standard.............................................................................................52
6.2.1. RS485 Full Duplex......................................................................................................................52
6.2.2. RS485 Full Duplex Multiplexed ..................................................................................................53
6.2.3. RS485 Half Duplex Multiplexed..................................................................................................53
6.2.4. Signal Ground.............................................................................................................................54
6.2.5. A and B Circuit Designators .......................................................................................................54
6.2.6. Maximum Cable Length .............................................................................................................55
6.2.7. RS485 Connections ...................................................................................................................55
6.3. Ethernet – 10Base2....................................................................................................................56
6.4. Ethernet – 10BaseT/100BaseT ..................................................................................................56
6.4.1. General Notes ............................................................................................................................57
6.4.2. Network Reflections ...................................................................................................................57
6.4.3. Network Load .............................................................................................................................58
6.5. Interface Adapter Connectors ....................................................................................................59
6.6. Further Sources of Information ..................................................................................................60
7. SOE Over Modbus Protocol .......................................................................................................61