Mitsubishi Electronics manual 150

11 TROUBLESHOOTING

MELSEC-Q

Error Code		Error Contents and Cause	Corrective Action	Corres-
				ponding
(SD0)	1
				CPU
4202		More than 16 nesting levels are programmed.	Keep nesting levels at 16 or under.
		A BREAK instruction was executed although no FOR instruction	Read the common error information at a peripheral device, check
4203			error step corresponding to its numerical value (program error
		has been executed prior to that.
			location), and correct the problem.
4210		The CALL instruction is executed, but there is no subroutine at the
		specified pointer.	Read the common error information at a peripheral device, check
			error step corresponding to its numerical value (program error
4211		There was no RET instruction in the executed sub-routine program.
4212		The RET instruction was before the FEND instruction in the main	location), and correct the problem.
		program.
4213		More than 16 nesting levels are programmed.	Keep nesting levels at 16 or under.
4220		Interrupt input was generated, but no corresponding interrupt
		pointer was found.
4221		There was no IRET instruction in the executed interrupt program.
4223		The IRET instruction was before the FEND instruction in the main
		program.	Read the common error information at a peripheral device, check
			error step corresponding to its numerical value (program error
4230		The number of CHK and CHKEND instructions is not equal.
4231		The number of IX and IXEND instructions is not equal.	location), and correct the problem.
		The configuration of the check conditions for the CHK instruction is
4235		incorrect.
		Alternatively, a CHK instruction has been used in a low speed
		execution type program.
4300		The designation of a MELSECNET/MINI-S3 master module control	Read the common error information at a peripheral device, check
		instruction was wrong.	error step corresponding to its numerical value (program error	QnA
			location), and correct the problem.
4301		The designation of an AD57/AD58 control instruction was wrong.
4400		No SFCP or SFCPEND instruction in SFC program.	Read common error information at a peripheral device, check error
4410		The block number designated by the SFC program exceeds the
		range.	step corresponding to its numerical value (program error location),
			and correct the problem.
4411		Block number designations overlap in SFC program.
4420		A step number designated in an SFC program exceeds 511.
4421		Total number of steps in all SFC programs exceed the range	Reduce total number of steps to below the maximum.
4422		Step number designations overlap in SFC program.	Read common error information at a peripheral device, check error
			step corresponding to its numerical value (program error location),
			and correct the problem.
4500		The numbers of BLOCK and BEND instructions in an SFC program
		are not equal.
4501		The configuration of the STEP to TRAN to TSET to SEND
		instructions in the SFC program is incorrect.	Read common error information at a peripheral device, check error
4502		There was no STEPI instruction in SFC program block.	step corresponding to its numerical value (program error location),
4503		The step designated by the TSET instruction in the SFC program	and correct the problem.
		does not exist.
4504		The step designated by the TAND instruction in the SFC program
		does not exist.
4600		The SFC program contains data that cannot be processed.	Read common error information at a peripheral device, check error
4601		Exceeds device range that can be designated by the SFC program.	step corresponding to its numerical value (program error location),
4602		The START instruction in an SFC program is proceeded by an END	and correct the problem.
		instruction.	The program is automatically subjected to an initial start.
4610		The active step information at presumptive start of an SFC program
		is incorrect.
4611		Key-switch was reset during RUN when presumptive start was
		designated for SFC program.
4620		Startup was executed at a block in the SFC program that was
		already started up.
4621		Startup was attempted at a block that does not exist in the SFC	Read common error information at a peripheral device, check error
		program.
			step corresponding to its numerical value (program error location),
		Startup was executed at a block in the SFC program that was
4630			and correct the problem.
		already started up.
4631		Startup was attempted at a block that does not exist in an SFC
		program.
4632		There were too many simultaneous active steps in blocks that can
		be designated by the SFC program.
4633		There were too many simultaneous active steps in all blocks that
		can be designated.
5000		Program scan time for initial execution type programs exceeds the	Read the error individual information at a peripheral device, check
		initial execution WDT time setting designated in the PLC RAS
		parameter.	the numerical value (time) there, and shorten scan time if
5001		The program scan time goes over the WDT value set in the	necessary.
		parameter PLC RAS parameter.
		(1) The scan time of the program exceeded the constant scan	(1) Review the constant scan setting time.
5010		setting time specified in the PC RAS setting parameter.	(2) Review the constant scan time and low speed program
		(2) The low speed program execution time specified in the PC RAS	execution time in the parameter so that the margin time of
		setting parameter exceeded the margin time of constant scan.	constant scan may be fully reserved.
		Low speed scan type program scan time goes over the low speed	Read the error individual information at a peripheral device, check
5011			the numerical value (time) there, and shorten scan time if
		execution WDT set in the parameter PC RAS settings.
			necessary.
6000		The control system and standby system in the redundant system do	Synchronise the programs and parameters of the control system
		not have the same programs and parameters.	and standby system.	Q4AR
6010		The operational status of the control system and standby system in	Synchronise the operation statuses of the control system and
		the redundant system is not the same.	standby system.

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

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