Allen-Bradley 1756-DHRIO - Interpreting the Status Indicators

Publication 1756-UM514B-EN-P - February 2003
Troubleshooting the 1756-DHRIO Module 12-3
Interpreting the
Status Indicators
The three LED status indicators on the module provide information
about your module and the status of each channel. The following
tables outline the indicator condition and the corresponding status,
and explain what each condition means.
Remote I/O
MUTE
LINK
No adapters found on
remote I/O.
Add an adapter to the remote I/O
network.
RACK
OVER
Rack overlap on
remote I/O.
Reconfigure remote I/O racks.
DUPL
SCAN
Duplicate scanner on
remote I/O.
Check remote I/O adapter settings.
MAX_
DEV_
Maximum devices
exceeded on remote
I/O.
Remove devices to meet limitations on
remote I/O network.
CHAT
LINK
Babble detected on
remote I/O.
Check remote I/O device and network
connections.
OFF_
LINE
Not trying to
communicate.
None. Normal state if controller is not
controlling remote I/O.
OK Normal operation None.
Table 12.2
Interpreting the Alphanumeric Display
Code Description Recommended Action
Table 12.3
Interpreting the OK Status Indicators
If the Module OK
indicator is:
Module Status Recommended Action
Off Not operating. Apply chassis power.
Verify module is completely inserted into
chassis and backplane.
Green flashing Operating but not
routing messages and
no controller
transferring I/O.
None, if no messages are actively being
routed through the module and no
controller transferring I/O.
To route messages or transfer I/O, use
module default configuration or
configure module.
Red, then Off Performing self-test. None, normal operation.
Green Operating and routing
messages.
Verify module configuration.
Red In major fault Reboot module. If red reoccurs, then
replace module.
Red flashing In major fault or
configuration fault.
Check alphanumeric indicator and take
action described in Table 12.2