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Maintenance
840 USE 106 00 January 2003 185
Communications Errors
LEDs If the CHS 110 module detects a communications error, the LEDs display the
following pattern:
LED display for a communications error.
Troubleshooting 1. Be sure the fiber optic cables are connected properly and functioning correctly
2. If the fiber optic cables are in good condition, replace the faulty CHS 110 module.
Interface Errors If the Hot Standby module detects certain errors in its interface with the controller,
the LED display goes out momentarily as the module tries to recover. It either
returns to a ready state or reports the error with a blinking Com Act indicator. The
Com Act error patterns are described in
Com Act Error Patterns, p. 209
.
Troubleshooting 1. If you used the CHS function block, disable it and restart the system. If the Ready
indicator comes on, the problem is in the CHS 110 module. If you used a
configuration extension screen, go offline and change the configuration to a
standalone system. Reload the program. Restart the system. If the Ready
indicator comes on, the problem is in the CHS 110 module.
2. If you have replaced the Hot Standby module and the problem still occurs,
replace the other components, one at a time.
3. If the problem still occurs, replace the backplane.
140
CHS 110 00
HOT STANDBY
Active
Ready Fault
Run Bal Low
Pwr ok
Modbus Com Err
Modbus! Error A
Com Act Error B
Primary
Mem Prt Standby