1 Publication 1756-UM514B-EN-P - February 2003
Chapter
12
Troubleshooting the 1756-DHRIO Module
What This Chapter Contains
This chapter describes your module’s diagnostics and methods of
troubleshooting your module.
Checking Power Supply
and Module Status
On power-up, three events take place simultaneously:
· Alphanumeric status indicator on the module illuminates and
cycles through the following sequence of messages:
– 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.
· Module OK status indicator shows solid red, then flashes green
· Power supply indicator shows solid green
For information about using See page
Checking Power Supply and Module Status 12-1
Interpreting the Alphanumeric Indicators 12-2
Interpreting the Status Indicators 12-3
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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