Omron FQM1-MMA21 Troubleshooting Problems in Modules, Section, Motion Control Module Errors

Troubleshooting Problems in Modules			Section 9-3
Motion Control Module Errors
Error condition		Probable cause	Remedy
The Motion Control Module’s RUN indicator does	An error in program is causing a		Correct program.
not go ON.	fatal error
Motion Control Module does not operate or does not	The I/O bus is faulty.		Replace the Motion Control
operate properly.			Module.
A particular I/O point does not operate.
Error occurs in 8-point or 16-point units.
A particular I/O point stays ON.
None of a particular Module’s I/O points will go ON.
Input Errors
Error condition		Probable cause	Remedy
None of inputs turn ON.	(1)	External input power supply	Connect a proper external input
(Indicators are not lit.)		is not being supplied.	power supply.
	(2)	The external input power	Adjust supply voltage to within
		supply voltage is too low.	proper range.
	(3)	Terminal block connector is	Replace terminal block connec-
		not making good contact.	tor.
None of inputs turn ON.	Input circuit is faulty.		Replace the Module.
(Indicators are lit.)
None of inputs turn OFF.	Input circuit is faulty.		Replace the Module.
A particular input does not turn ON.	(1)	Input device is faulty.	Replace the input device.
	(2)	Input wiring disconnected.	Check input wiring.
	(3)	Faulty terminal block connec-	Replace terminal block connec-
		tor contact.	tor.
	(4)	External input’s ON time is	Adjust input device
		too short.
	(5)	Faulty input circuit	Replace the Module.
	(6)	An input bit address is used	Correct program.
		in an output instruction.
A particular input does not turn OFF.	(1)	Input circuit is faulty.	Replace the Module.
	(2)	An input bit address is used	Correct program.
		in an output instruction.
Input turns ON/OFF irregularly.	(1)	External input voltage is low	Adjust external input voltage to
		or unstable.	within the proper range.
	(2)	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 inputs and loads.
	(3)	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.
Input indicator does not light, but input operates nor-	Faulty indicator or indicator cir-		Replace the Module.
mally.	cuit.

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