Schneider Electric 840 USE 106 0 manual Detecting Failures in the Primary Backplane

Maintenance

Detecting Failures in the Primary Backplane

Troubleshooting		To determine which component failed, compare the status of the controller, Hot
Components		Standby module and RIO head to the chart below:
Controller	CHS 110		RIO Head	Failure Type	Description
Stops	All LEDs off		All LEDs off except	READY on and	The Interface error patterns
	except READY		READY	COM ACT blinks	are described in Com Act
	OR COM ACT			four times	Error Patterns, p. 209
	displays error
	pattern
Runs as offline	All LEDs off		All LEDs off except	CHS 110	The Com Act error patterns
	except READY		READY		are described in (See Com
	OR COM ACT				Act Error Patterns, p. 209)
	displays error
	pattern
Stops	All LEDs off		All LEDs off except	RIO Head	The Com Act error patterns
	except READY		READY OR COM		are described in Com Act
			ACT displays error		Error Patterns, p. 209
			pattern
Stops	All LEDs off		READY on and COM	RIO Cable Failure at	In a dual cable system, if only
	except READY		ACT blinks four times	Primary End	one cable fails, the Error A or
					Error B indicator on the RIO
					head lights instead and the
					system continues to operate.
					When the RIO cable fails at
					the Primary end, input data
					may be reset to 0 for one
					scan because the
					communication failure to the
					drop occurs before the
					broken link is detected.

840 USE 106 00 January 2003 189