Rockwell Automation 1756-DH485 ControlLogix DH-485 Communication Module User Manual - Manual (Page 101)

Publication 1756-UM532A-EN-P - May 2006
Troubleshoot the 1756-DH485 Module B-5
Routing Errors in Remote DH-485 Messaging
If the 1756-DH485 module has a problem with routing a Remote DH-485
Message, it may return a response with an error status of D0 hex. An SLC
controller displays this error as D000 hex when monitoring the message
instruction. If you receive this error message, take the following actions:
• Check your message instruction to make sure a valid local node
destination, link ID and destination node were entered.
• Check your routing table in each 1756-DH485 module that the message
passes through.
• Connect and apply power to all 1756-DH485 modules.
Interpret the Channel Status Indicators
If the Channel A
or B Indicator
is In This Channel
Mode Then the Channel
Status is Take This Action
Off All Not online. Place channel online.
DH485 No other node on the
network. Check cables.
Green DH485 Operating. None, normal
operation.