Publication 1756-UM514B-EN-P - February 2003
1-6 1756-DHRIO Module Description
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 may display
across the alphanumeric indicators, and for troubleshooting
information, see
Chapter 12, Troubleshooting the 1756-DHRIO
Module.
CHA
CHB OK
H+/RIO
Alphanumeric status indicator illuminates and cycles through a
sequence of messages (described in the table on the following page).
43241
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
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