User`s manual

Error code list Troubleshooting
MELSEC System Q, Hardware 11 – 75
4202
FOR NEXT ERROR
More than 16 nesting levels are programmed.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
When instruction executed
Keep nesting levels at 16 or under.
OFF Flicker Stop )
4203
FOR NEXT ERROR
A BREAK instruction was executed although no
FOR instruction has been executed prior to that.
 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 )
4210
CAN’T EXECUTE (P)
The CALL instruction is executed, but there is no
subroutine at the specified pointer.
 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 )
4211
CAN’T EXECUTE (P)
There was no RET instruction in the executed
subroutine 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 )
4212
CAN’T EXECUTE (P)
The RET 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 )
4213
CAN’T EXECUTE (P)
More than 16 nesting levels are programmed.
 Collateral information

Common Information: Program error location
 Individual Information: —
 Diagnostic Timing
When instruction executed
Keep nesting levels at 16 or under.
OFF Flicker Stop )
4220
CAN’T EXECUTE (I)
Though an interrupt input occurred, the corre-
sponding interrupt pointer does not exist.
 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 )
4221
CAN’T EXECUTE (I)
An IRET instruction does not exist in the exe-
cuted interrupt 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 )
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