Bradley Smoker PLC-5 Off Chassis fault Problem exists between, No communication, On link

F-8Troubleshooting

Troubleshooting Guide for the 1771-ASB Series C and D

Adapter Module (continued)

Indicators			Description	Probable Cause		Recommended Action
Active	Adapter	I/O
	Fault	Rack
Off	Off	On	I/O chassis fault. (1)	Problem exists between:		Cycle power to the chassis to clear a
			No communication	•	adapter and module in chassis; the	problem resulting from high noise.(2)
			on link.
					module will stay in fault mode until	•	Remove and replace all I/O modules one at a
					fault is corrected
							time
				•	shorted printed circuit board runs on
						•	If problem does not clear, something is
					backplane or I/O module
							wrong in chassis or I/O module
Blink	Off	On	Communication	•	Noise on backplane	•	Eliminate noise
			on link.	•	Shorted circuit board runs	•	Isolate noise
			Possible shorted	•	Faulty card in chassis	•	Add surge suppression
			backplane			•	Replace chassis
						•	Replace defective card in chassis
Blink	On	Off	Module identification	Excessive noise on backplane		Verify power supply and chassis grounding.
			line fault
Off	Off	Off	Module not	Power supply fault		Check power supply, cable connections,
			communicating			and make sure adapter module is fully
						seated in chassis.
				Wiring from scanner to adapter		Correct cable and wiring defects
				module disrupted
				Scanner not configured properly		See publication 1772-2.18 for scanner
						configuration.
				One faulted chassis within a rack		Check sequentially from the first module to
				group address causing		the last module to pinpoint fault; correct
				scanner/distribution panel to fault all		any faults and proceed to the next chassis.
				chassis in rack group address (when in
				disable search mode)

(1)The I/O chassis is in faulted mode as selected by the last state switch on the chassis backplane.

(2)Cycling power clears block-transfer request queue. All pending block transfers are lost. Your program must repeat the request for block transfers.

Publication 1785-UM012D-EN-P - July 2005