Mitsubishi QJ71LP21 Reference Manual page 335

8 TROUBLESHOOTING
Error
Code Error Contents and Cause
*1
(SD0)
The numbers of BLOCK and BEND
4500 instructions in an SFC program are not
equal.
The configuration of the STEP* to
4501 TRAN* to TSET to SEND instructions
in the SFC program is incorrect.
The structure of the SFC program is
illegal.
4502
• STEPI* instruction does not exist in
the block of the SFC program.
The structure of the SFC program is
illegal.
• The step specified in the TSET
4503 instruction does not exist.
• In jump transition, the host step
number was specified as the
destination step number.
The structure of the SFC program is
illegal.
4504
• The step specified in the TAND
instruction does not exist.
The structure of the SFC program is
illegal.
• In the operation output of a step, the
4505
SET Sn/BLmSn or RST Sn/BLmSn
instruction was specified for the host
step.
The structure of the SFC program is
illegal.
4506 • In a reset step, the host step number
was specified as the destination
step.
The SFC program contains data that
4600
cannot be processed.
Exceeds device range that can be
4601
designated by the SFC program.
The START instruction in an SFC
4602 program is preceded by an END
instruction.
*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
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.
Write the program to the CPU module
again using GX Developer.
• Write the program to the CPU
module again using GX Developer.
• 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.
Read the common information of the
error using GX Developer, and check
and correct the error step
corresponding to that value (program
error location).
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.
MELSEC-Q
Corresponding
CPU
QnA
Q00J/Q00/
*12
Q01
Qn(H)
QnPH
QnPRH
Q00J/Q00/
*12
Q01
QnA
Qn(H)
QnPH
QnPRH
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