Schneider Electric 840 USE 106 0 Communications Errors, LEDs, Troubleshooting, Interface Errors

Maintenance

Communications Errors

LEDs	If the CHS 110 module detects a communications error, the LEDs display the
	following pattern:
	LED display for a communications error.
	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
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.

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