Mitsubishi Electronics manual 138

11 TROUBLESHOOTING

MELSEC-Q

Error Code		Error Contents and Cause	Corrective Action	Corres-
				ponding
(SD0)	1
				CPU
		• There was no response from the intelligent function module during	The CPU module is experiencing hardware problems. Contact your	QCPU
		initial communication stage.
		• The size of the buffer memory of the intelligent function module is	nearest Mitsubishi representative.	Rem
		wrong.
1401		When parameter I/O allocation was being made, there was no
		return signal from the special function module during initial	The special function module that was being accessed is
		processing stage.
			experiencing hardware problems. Contact your nearest Mitsubishi	QnA
		When error is generated, the initial I/O number of the special
			representative.
		function module that corresponds to the common information is
		stored.
		The intelligent function module was accessed in the program, but	This suggests a CPU module hardware error. Contact your nearest	QCPU
		there was no response.	Mitsubishi representative.	Rem
1402
		The special function module was accessed during the execution of	The special function module that was being accessed is
		a FROM/TO instruction set, but there was no response.
			experiencing hardware problems. Contact your nearest Mitsubishi	QnA
		When an error is generated, the program error location
			representative.
		corresponding to the individual information is stored.
		• There was no response from the intelligent function module when	The intelligent function module that was being accessed is	QCPU
1403		the END instruction is executed.	experiencing hardware problems. Contact your nearest Mitsubishi
				Rem
		• An error is detected at the intelligent function module.	representative.
		When performing a parameter I/O allocation a special function
1411		module could not be accessed during initial communications.		Rem
		On error occurring, the head I/O number of the corresponding	A special function module, the CPU module, or the base unit is
		special function module is stored in the common information.
			experiencing problems. Contact your nearest Mitsubishi
		The FROM/TO instruction set could not be executed, due to a	representative.
1412		system bus error with a special function module.
		On error occurring, the program error location is stored in the
		individual information.
			(1) Change the High Performance model QCPU of function version	QCPU
			A for the High Performance model QCPU of function version B.
		The High Performance model QCPU of function version A was		function
			(2) An intelligent function module, CPU module or the base unit is
		loaded in a multiple CPU system configuration.		Ver. B
1413			experiencing problems. Contact your nearest Mitsubishi
				or later
			representative.
		An error is detected on the system bus.	An intelligent function module, the CPU module, or the base unit is	QCPU
			experiencing problems. Contact your nearest Mitsubishi
		• Wait-length time-out, arbitration time-out.		Rem
			representative.
		Fault of the loaded module was detected.	(1) Change the High Performance model QCPU of function version	QCPU
			A for the High Performance model QCPU of function version B.
				function
		The High Performance model QCPU of function version A was	(2) An intelligent function module, CPU module or the base unit is
				Ver. B
		loaded in a multiple CPU system configuration.	experiencing problems. Contact your nearest Mitsubishi
1414				or later
			representative.
		An error is detected on the system bus.	An intelligent function module, the CPU module, or the base unit is	QCPU
			experiencing problems. Contact your nearest Mitsubishi
				Rem
			representative.
1415		Fault of the main or extension base unit was detected.	An intelligent function module, CPU module or the base unit is	QCPU
				function
			experiencing problems. Contact your nearest Mitsubishi
				Ver. B
1416		System bus fault was detected at PLC power-on or CPU module	representative.
		reset.		or later
1421		Hardware fault at the system management module AS92R.	This is experiencing hardware problems.	Q4AR
			Contact your nearest Mitsubishi representative.
1500		A momentary power supply interruption has occurred.	Check the power supply.
		The power supply went off.		Rem
1510		The 5 VDC supplied to one of the two power-supply modules in the
		redundant system extension base unit has dropped below 85% of	Check the supply voltage of the power supply module. If the voltage
		the rated voltage.
			is abnormal then replace the power supply module.	Q4AR
1520		The 5 VDC supplied to the power-supply modules in the extension
		base unit has dropped below 80% of the rated voltage.
1530		The 24 VDC power supplied to the system management module	Check the power supply.
		AS92R has dropped below 85% of the rated voltage.
1600		(1) Voltage in the CPU module battery.	(1) Change the battery.
			(2) If the battery is for program memory, standard RAM or for the
		(2) The CPU module battery is not connected.
			back-up power function, install a lead connector.
1601		Voltage of the battery on memory card 1 has dropped below	Change the battery.
		stipulated level.
1602		Voltage of the battery on memory card 2 has dropped below	Change the battery.	QnA
		stipulated level.
			Read the error common information at the peripheral device, and
		I/O module information power ON is changed.	check and/or change the module that corresponds to the numerical
			value (module number) there.
		I/O module (or special function module) not installed properly or		Rem
			Alternatively, monitor the special registers SD1400 to SD1431 at a
		installed on the base unit.
2000			peripheral device, and change the fuse at the output module whose
			bit has a value of "1".
		The High Performance model QCPU of function version A was	Change the High Performance model QCPU of function version A	QCPU
				function
		loaded in a multiple CPU system configuration.	for the High Performance model QCPU of function version B.	Ver. B
				or later

1 Characters in parentheses ( ) indicate the special register numbers where individual information is being stored.

11 - 22 11 - 22