User`s manual

Troubleshooting Error code list
11 – 76
4223
CAN’T EXECUTE (I)
The IRET instruction exists before the FEND
instruction of the main routine program.
 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 )
CAN’T EXECUTE (I)
– The IRET instruction was executed in the fixed
scan execution type program.
– The STOP instruction was executed in the
fixed scan execution type program.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
When instruction executed
QnU
4225
CAN’T EXECUTE (I)
The interrupt pointer for the module mounted on
the extension base unit is set in the redundant
system.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
When instruction executed
Delete the setting of interrupt pointer for the
module mounted on the extension base unit,
since it cannot be used.
OFF Flicker Stop QnPRH (first 5
digits of serial
No. is 09012 or
later)
4230
INST. FORMAT ERR
The number of CHK and CHKEND instructions is
not equal.
 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 Qn(H)
QnPH
4231
INST. FORMAT ERR
The number of IX and IXEND instructions is not
equal.
 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 )
4235
INST. FORMAT ERR
The configuration of the check conditions for the
CHK instruction is incorrect.
Alternatively, a CHK instruction has been used in
a low speed execution type program.
 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 Qn(H)
QnPH
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