Mitsubishi QJ71BR11 - Page 335

8 TROUBLESHOOTING
MELSEC-Q
8 - 124 8 - 124
*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.
Error
Code
(SD0)
*1
Error Contents and Cause Corrective Action
Corresponding
CPU
4500
The numbers of BLOCK and BEND
instructions in an SFC program are not
equal.
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.
4501
The configuration of the STEP* to
TRAN* to TSET to SEND instructions
in the SFC program is incorrect.
4502
The structure of the SFC program is
illegal.
• STEPI* instruction does not exist in
the block of the SFC program.
Write the program to the CPU module
again using GX Developer.
QnA
Q00J/Q00/
Q01
*12
Qn(H)
QnPH
QnPRH
4503
The structure of the SFC program is
illegal.
• The step specified in the TSET
instruction does not exist.
• In jump transition, the host step
number was specified as the
destination step number.
• 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).
4504
The structure of the SFC program is
illegal.
• The step specified in the TAND
instruction does not exist.
Write the program to the CPU module
again using GX Developer.
4505
The structure of the SFC program is
illegal.
• In the operation output of a step, the
SET Sn/BLmSn or RST Sn/BLmSn
instruction was specified for the host
step.
Read the common information of the
error using GX Developer, and check
and correct the error step
corresponding to that value (program
error location).
Q00J/Q00/
Q01
*12
4506
The structure of the SFC program is
illegal.
• In a reset step, the host step number
was specified as the destination
step.
4600
The SFC program contains data that
cannot be processed.
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.
QnA
Qn(H)
QnPH
QnPRH
4601
Exceeds device range that can be
designated by the SFC program.
4602
The START instruction in an SFC
program is preceded by an END
instruction.