Omron FQM1-MMP21, FQM1-CM001 Troubleshooting Problems in Modules, Section, Output Errors

Troubleshooting Problems in Modules			Section 9-3
Output Errors
Error condition		Probable cause	Remedy
None of the outputs will go ON.	(1) The load power is not being		Supply power.
		supplied.
	(2)	Load power supply voltage is	Adjust voltage to within the
		too low.	allowed range.
	(3)	Faulty terminal block connec-	Replace terminal block connec-
		tor contact.	tor.
	(4)	Output circuit is faulty.	Replace the Module.
None of the outputs will go OFF.	Output circuit is faulty.		Replace the Module.
A specific bit address’ output does not turn ON.	(1) Output ON time too short		Correct program to increase the
(Indicator is not lit.)		because of a program error.	time that the output is ON.
	(2)	The bit’s status is controlled	Correct program so that each
		by multiple output instruc-	output bit is controlled by only
		tions.	one instruction.
	(3)	Faulty output circuit.	Replace the Module.
A specific bit address’ output does not turn ON.	(1) Faulty output device.		Replace output device.
(Indicator is lit).
	(2)	Break in output wiring.	Check output wiring.
	(3)	Faulty terminal block connec-	Replace terminal block connec-
		tor.	tor.
A specific bit address’ output does not turn OFF.	Output does not turn OFF due to		Replace external load or add
(Indicator is not lit.)	leakage current or residual volt-		dummy resistor.
	age.
Output of a specific bit number does not turn OFF.	(1) The bit’s status is controlled		Correct program.
(Indicator lit.)		by multiple output instruc-
		tions.
	(2)	Faulty output circuit.	Replace the Module.
Output turns ON/OFF irregularly.	(1) Low or unstable load voltage.		Adjust load voltage to within
			proper range
	(2)	The bit’s status is controlled	Correct program so that each
		by multiple output instruc-	output bit is controlled by only
		tions.	one instruction.
	(3)	Malfunction due to noise.	Take protective measures
			against noise, such as:
			(1) Install surge suppressor.
			(2) Install isolating transformer.
			(3) Install shielded cables
			between the outputs and loads.
	(4)	Faulty terminal block connec-	Replace terminal block connec-
		tor contact.	tor.
Errors occur in 8-point or 16-point blocks, i.e., for the	(1) Faulty terminal block connec-		Replace terminal block connec-
same common.		tor contact.	tor.
	(2)	Faulty data bus	Replace the Module.
	(3)	Faulty CPU	Replace the Module.
Output indicator does not light, but output operates	Faulty indicator or indicator cir-		Replace the Module.
normally.	cuit.

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