Mitsubishi QJ71LP21 Reference Manual page 333

8 TROUBLESHOOTING
Error
Code Error Contents and Cause
*1
(SD0)
Total number of steps in all SFC
4421
programs exceed the range.
Step number designations overlap in
4422
SFC program.
Step relays are insufficient in the SFC
4423
program.
The SFC program cannot be
executed.
• The data of the block data setting is
illegal.
4430
• The SFC data device of the block
data setting is beyond the device
setting range set in the PLC
parameter.
The SFC program cannot be
executed.
4431
• The block parameter setting is
abnormal.
The SFC program cannot be
executed.
4432
• The structure of the SFC program is
illegal.
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being
stored.
*12 : This applies to the CPU module of function version B or later.
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Corrective Action
Reduce total number of steps to below
the maximum.
Read common information of the error
using the peripheral device, check
error step corresponding to its
numerical value (program error
location), and correct the problem.
Read the common information of the
error using GX Developer, and check
and correct the error step
corresponding to that value (program
error location).
• Write the program to the CPU
module again using GX Developer.
• After correcting the setting of the
SFC data device, write it to the CPU
module.
• After correcting the device setting
range set in the PLC parameter,
write it to the CPU module.
Write the program to the CPU module
again using GX Developer.
MELSEC-Q
Corresponding
CPU
Q00J/Q00/
*12
Q01
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