User`s manual

Troubleshooting Error code list
11 – 80
4502
SFCP. FORMAT ERR.
The structure of the SFC program is illegal.
STEPI* instruction does not exist in the block of
the SFC program.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
STOP → RUN
Write the program to the CPU module again
using GX (IEC) Developer.
OFF Flicker Stop Q00J/Q00/Q01
(Function
version is B or
later)
Qn(H)
QnPRH
QnU
4503
SFCP. FORMAT ERR.
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.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
STOP → RUN
– Write the program to the CPU module again
using GX (IEC) Developer.
– Read the common information of the error
using GX (IEC) Developer, check error step
corresponding to its numerical value (pro-
gram error location), and correct the problem.
OFF Flicker Stop
4504
SFCP. FORMAT ERR.
The structure of the SFC program is illegal.
The step specified in the TAND instruction does
not exist.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
STOP → RUN
Write the program to the CPU module again
using GX (IEC) Developer.
OFF Flicker Stop
4505
SFCP. FORMAT ERR.
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 speci-
fied for the host step.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
STOP → RUN
Read the common information of the error using
GX (IEC) Developer, check error step corre-
sponding to its numerical value (program error
location), and correct the problem.
OFF Flicker Stop Q00J/Q00/Q01
(Function
version is B or
later)
QnU
4506
SFCP. FORMAT ERR.
The structure of the SFC program is illegal.
In a reset step, the host step number was speci-
fied as the destination step.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
STOP → RUN
Read the common information of the error using
GX (IEC) Developer, check error step corre-
sponding to its numerical value (program error
location), and correct the problem.
OFF Flicker Stop
Error
code
Error contents and cause Corrective action
LED status
CPU
status
Corre-
sponding
CPU
RUN ERR.
Tab. 11-6: Error code list (4000 to 4999) for PLC CPUs of MELSEC System Q