Publication 1756-UM532A-EN-P - May 2006
1756-DH485 Module Overview
1-9
Alphanumeric Indicators
When you apply power to the module, the alphanumeric display begins to
cycle through the following sequence.
1.
All LEDs flash on then off -CHA, CHB OK
2.
OK displays red then changes to green.
3.
INIT displays.
4.
Firmware Revision flashes on scrolling display: DH-485
5.
Channel A and the network used for channel A.
6.
Channel A node address.
7.
Channel A status.
8.
Channel B and the network used for channel.
9.
Channel B node address.
10.
Channel B status.
This sequence runs continuously during normal module operation.
Refer to Appendix B, Troubleshoot the 1756-DH485 Module and publication
1756-IN587, the ControlLogix DH-485 Communications Module Installation
Instructions, for more information about LEDs and status indicators.
EXAMPLE
For example, if your module uses the following:
•
Channel A for DH-485 with node address 14
•
Channel B is not connected
and the channels are operating properly, you see the
following sequence:
A DH, A#14, A OK, B DH, B#00, ONLY NODE
Summary of Contents for ControlLogix 1756-DH485
Page 1: ...ControlLogix DH 485 Communication Module 1756 DH485 User Manual...
Page 8: ...Publication 1756 UM532A EN P May 2006 Preface ii Notes...
Page 18: ...Publication 1756 UM532A EN P May 2006 1 10 1756 DH485 Module Overview Notes...
Page 32: ...Publication 1756 UM532A EN P May 2006 2 14 Overview of the DH 485 Network Notes...
Page 102: ...Publication 1756 UM532A EN P May 2006 B 6 Troubleshoot the 1756 DH485 Module Notes...
Page 106: ...Publication 1756 UM532A EN P May 2006 iv Index Notes...
Page 109: ......