User`s manual

Troubleshooting Error code list
11 – 78
4355
MULTI-COM.ERROR
The number of read/write data (number of
request/receive data) for the multiple CPU high-
speed transmission dedicated instruction speci-
fied by the program is not valid.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
When instruction executed
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 QnU (except
Q00UJ-, Q00U-,
Q01U- and
Q02UCPU)
4400
SFCP. CODE ERROR
No SFCP or SFCPEND instruction in SFC pro-
gram.
 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
4410
CAN’T SET (BL)
The block number designated by the SFC pro-
gram exceeds the range.
 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
4411
CAN’T SET (BL)
Block number designations overlap in SFC pro-
gram.
 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
4420
CAN’T SET (S)
A step number designated in an SFC program
exceeds the range.
 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
4421
CAN’T SET (S)
Total number of steps in all SFC programs
exceed the maximum.
 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
4422
CAN’T SET (S)
Step number designations overlap in SFC pro-
gram.
 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
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