Honeywell HC900 manual Bad Module Diagnostics

Diagnostics and Troubleshooting - User Interface

I/O Module Diagnostics

To indicate the type of diagnostic failure, the module’s status LED is flashed red with a number of quick strobes followed by a long off time. The table below outlines the potential module diagnostics.

Table 28 - Bad Module Diagnostics

Failure	Description	AI	AO	DI			DO			# of	User Action
										Strobes
				Con-	AC	DC	Re-	AC	DC
				tact			lay
FAIL SAFE	The module is in the	√	√	√	√	√	√	√	√	1	1. If expansion rack(C50 CPU only), check
	failsafe state because										communication link connection to main CPU
	it is not receiving										2. Remove the module and check for a bent
	message requests
											pin, then reinsert the module.
	from the main
											3. Measure Power Supply voltage; if not within
	CPU/Scanner at a
	rate equal to the										specifications, replace the power supply.
	value configured for										4. Replace the I/O Module.
	its failsafe timeout.
											5. Remove other modules and replace one at a
											time until the problem reoccurs. Most likely
											the last module inserted needs to be
											replaced.
											6. Replace the rack.
EAROM	EA ROM Failed its	√	√							2	Replace Module
	checksum
RAM		√	√							3	Replace Module
ROM										4
+24 V		√	√	√			√			5	1. Remove the module and check for a bent
											pin, then reinsert the module.
											2. Replace module.
											3. Measure 24V at test points on Power Supply.
											If below 21.6V, replace Power Supply.
											4. Replace Rack.
FACTORY CAL	CRC failure of	√	√							6	Replace Module.
	primary and backup
	factory calibration
FIELD CAL	CRC failure of field	√	√							7	None; controller will switch card to Factory Cal.
	calibration values
HARDWARE	General Hardware	√								8	Replace module.
	Failure (AI=convertor
	not working)
HW/SW Key	The software residing			√	√	√	√	√	√	9	Replace module.
	on the module does
	not match the module
	type. This diagnostic
	should only result in
	the factory.
Shift Register	The loopback test of			√	√	√	√	√	√	11	Replace module.
	the shift register
	failed.

Revision 5	HC900 Hybrid Controller Installation and User Guide	133
9/03