Omron CQM1H-SCB41 operation manual Front-panel Indicator Error Displays

	Board Replacement				Section 9-1
9-1		Front-panel Indicator Error Displays
		Indicators		Possible cause	Remedy
	Board		CPU Unit
	RDY		ERR/ALM
	Lit		Not lit	The Serial Communications Board has	---
				started normally.
	Not lit		Lit	The Serial Communications Board is faulty	If the ERR and ALM indicators light when
				(hardware self-diagnostic function).	the Serial Communications Board is
				Board watchdog timer error: IR 20000 will	mounted to another CPU Unit, replace the
				turn ON.	Serial Communications Board.
				A bus error has occurred.	Firmly secure the Serial Communications
				An initialization recognition error has	Board to the CPU Unit.
				occurred (the Serial Communications
				Board is not correctly recognized by the
				CPU Unit).
	Not lit		Not lit	The CPU Unit is not receiving normal	Check the power supply voltage and
				power supply.	supply the correct electric power to the
					Unit.
				The Serial Communications Board is not	Firmly secure the Serial Communications
				correctly secured to the CPU Unit.	Board.
				The Serial Communications Board is faulty.	If all the indicators are not lit when the
					Serial Communications Board is mounted
				An error (such as a CPU Unit WDT error)	to another CPU Unit, replace the Serial
					Communications Board.
				has occurred in the CPU Unit.
					Eliminate the cause of the error. If the error
					persists, replace the CPU Unit.
	Lit		Lit	The Serial Communications Board is faulty.	If all the indicators are lit when the Serial
					Communications Board is mounted in
					another CPU Unit, replace the Serial
				A bus error has occurred.	Communications Board.
					Check the operating environment and
					eliminate the cause of the error.
					Firmly secure the Serial Communications
					Board.
	Lit		Flashing	An error has occurred in the CPU Unit.	Eliminate the cause of the error. If the error
				(Cause of error eliminated, but error not	persists, replace the CPU Unit.
				cleared.)
	Flashing		Flashing	A protocol data write error has occurred or	If the indicator status remains the same
				protocol data has been destroyed.	when the protocol data is retransmitted,
				(Protocol data error: IR 20002)	replace the Serial Communications Board.
				Connector may have become loose or the	Transfer protocol data to the Serial
				PC power supply may have turned OFF	Communications Board.
				while transferring protocol data.	Conduct a loopback test. If an error
				There is no protocol data.	occurs, replace the Serial Communications
					Board.
				The communications circuit is faulty.	Correct the protocol data and transfer it to
				(Board Identification Error Flag: IR 20001)	the Serial Communications Board.
				A protocol data syntax error has occurred.	Try executing a normal sequence for the
				(Protocol macro error code: 4)	serial port where the error is occurring or
					switch the CPU Unit to PROGRAM mode
					and remove the cause of the error.
				A PC Setup error has occurred.	Correct the PC Setup settings.
				(PC Setup Error Flags: IR 20013 to
				IR 20015)

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