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MELSEC-Q
11 TROUBLESHOOTING
Error Code
(SD0)
1
Error Contents and Cause Corrective Action
Corres-
ponding
CPU
4202 More than 16 nesting levels are programmed. Keep nesting levels at 16 or under.
4203
A BREAK instruction was executed although no FOR instruction
has been executed prior to that.
Read the common error information at a peripheral device, check
error step corresponding to its numerical value (program error
location), and correct the problem.
4210
The CALL instruction is executed, but there is no subroutine at the
specified pointer.
4211 There was no RET instruction in the executed sub-routine program.
4212
The RET 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
location), and correct the problem.
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.
4230 The number of CHK and CHKEND instructions is not equal.
4231 The number of IX and IXEND instructions is not equal.
4235
The configuration of the check conditions for the CHK instruction is
incorrect.
Alternatively, a CHK instruction has been used in a low speed
execution type program.
Read the common error information at a peripheral device, check
error step corresponding to its numerical value (program error
location), and correct the problem.
4300
The designation of a MELSECNET/MINI-S3 master module control
instruction was wrong.
4301 The designation of an AD57/AD58 control instruction was wrong.
Read the common error information at a peripheral device, check
error step corresponding to its numerical value (program error
location), and correct the problem.
QnA
4400 No SFCP or SFCPEND instruction in SFC program.
4410
The block number designated by the SFC program exceeds the
range.
4411 Block number designations overlap in SFC program.
4420 A step number designated in an SFC program exceeds 511.
Read common error information at a peripheral device, check error
step corresponding to its numerical value (program error location),
and correct the problem.
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.
4502 There was no STEPI instruction in SFC program block.
4503
The step designated by the TSET instruction in the SFC program
does not exist.
4504
The step designated by the TAND instruction in the SFC program
does not exist.
Read common error information at a peripheral device, check error
step corresponding to its numerical value (program error location),
and correct the problem.
4600 The SFC program contains data that cannot be processed.
4601 Exceeds device range that can be designated by the SFC program.
4602
The START instruction in an SFC program is proceeded by an END
instruction.
Read common error information at a peripheral device, check error
step corresponding to its numerical value (program error location),
and correct the problem.
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
program.
4630
Startup was executed at a block in the SFC program that was
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.
Read common error information at a peripheral device, check error
step corresponding to its numerical value (program error location),
and correct the problem.
5000
Program scan time for initial execution type programs exceeds the
initial execution WDT time setting designated in the PLC RAS
parameter.
5001
The program scan time goes over the WDT value set in the
parameter PLC RAS parameter.
Read the error individual information at a peripheral device, check
the numerical value (time) there, and shorten scan time if
necessary.
5010
(1) The scan time of the program exceeded the constant scan
setting time specified in the PC RAS setting parameter.
(2) The low speed program execution time specified in the PC RAS
setting parameter exceeded the margin time of constant scan.
(1) Review the constant scan setting time.
(2) Review the constant scan time and low speed program
execution time in the parameter so that the margin time of
constant scan may be fully reserved.
5011
Low speed scan type program scan time goes over the low speed
execution WDT set in the parameter PC RAS settings.
Read the error individual information at a peripheral device, check
the numerical value (time) there, and shorten scan time if
necessary.
6000
The control system and standby system in the redundant system do
not have the same programs and parameters.
Synchronise the programs and parameters of the control system
and standby system.
6010
The operational status of the control system and standby system in
the redundant system is not the same.
Synchronise the operation statuses of the control system and
standby system.
Q4AR
1 Characters in parentheses ( ) indicate the special register numbers where individual information is being stored.