Allen-Bradley PLC-5 User Manual page 355

Indicators
Active Adapter I/O
Fault Rack
Blink alternately Off
(1)
If a fault occurs and the Controller is in the run mode but is actually operating in the dependent mode, the chassis fault response mode is selected by the last state switch
on the chassis backplane.
(2)
The I/O chassis is in faulted mode as selected by the last state switch on the chassis backplane.
(3)
You must select the operating mode of the remote I/O adapter module as outlined in the publication furnished with the remote I/O scanner/distribution panel, remote I/O
scanner-program interface module, or I/O scanner-message handling module. Pay close attention to the disable search mode in the 1771-SD, -SD2.
Description Probable Cause
Adapter module not Controller restart lockout switch on
(2) chassis backplane switch assembly
actively controlling I/O
(3)
on
Adapter module in
controller restart lockout
mode (adapter to
scanner link is normal)
Troubleshooting
Recommended Action
Press reset button to clear lockout feature
or cycle power; if after repeated attempts
indicators are still blinking, check:
• push button not wired properly to field wiring
arm
• wiring arm not connected to adapter module
• adapter module was reset by process or/
scanner, then immediately faulted
Publication 1785-UM012D-EN-P - July 2005
F-7