User`s manual

Error code list Troubleshooting
MELSEC System Q, Hardware 11 – 79
4423
CAN’T SET (S)
The total number of (maximum step No.+1) of
each block exceeds the total number of step
relays.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
STOP → RUN
Correct the total number of step relays so that it
does not exceed the total number of (maximum
step No.+1) of each block.
OFF Flicker Stop Q00J/Q00/Q01
(Function
version is B or
later)
QnU
4430
SFC EXE. ERROR
The SFC program cannot be executed.
– The data of the block data setting is illegal.
– The SFC data device of the block data setting
is beyond the device setting range set in the
PLC parameter.
 Collateral information

Common Information: File name/Drive name
 Individual Information: —
 Diagnostic Timing
STOP → RUN
– Write the program to the CPU module again
using GX (IEC) 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 mod-
ule.
OFF Flicker Stop
4431
SFC EXE. ERROR
The SFC program cannot be executed. The block
parameter setting is abnormal.
 Collateral information

Common Information: File name/Drive name
 Individual Information: —
 Diagnostic Timing
STOP → RUN
Write the program to the CPU module again
using GX (IEC) Developer.
OFF Flicker Stop
4432
SFC EXE. ERROR
The SFC program cannot be executed.
The structure of the SFC program is illegal.
 Collateral information

Common Information: File name/Drive name
 Individual Information: —
 Diagnostic Timing
STOP → RUN
Write the program to the CPU module again
using GX (IEC) Developer.
OFF Flicker Stop
4500
SFCP. FORMAT ERR.
The numbers of BLOCK and BEND instructions in
an SFC program are not equal.
 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 Qn(H)
QnPH
QnPRH
4501
SFCP. FORMAT ERR.
The configuration of the STEP* to TRAN* to
TSET to SEND instructions in the SFC program is
incorrect.
 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 Qn(H)
QnPH
QnPRH
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