Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module - Manual (Page 18)

18 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014
Chapter 1 About the Module
Alphanumeric Indicators
At power-up the module’s alphanumeric display begins a cycle through the
following sequences.
• Channel A and the network used for channel A - DH+ or RIO
• Channel A node address, if used for DH+
• Channel A status
• Channel B and the network used for channel B - DH+ or RIO
• Channel B node address, if used for DH+
• Channel B status
This sequence runs continuously during normal module operation.
For a detailed list of the status and error messages that can be displayed across the
alphanumeric indicators, and for troubleshooting information, see
Chapter 13 .
CHA CHB OK
H+/RIO
Alphanumeric status indicator illuminates and cycles through a
sequence of messages (described in the table on the following page).
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EXAMPLE For example, if your module uses the following:
• Channel A for DH+ with node address 14
• Channel B for RIO
and the channels are operating properly, you see the following sequence:
• A DH, A#14, A OK, B IO, SCAN, B OK