User`s manual

Error code list Troubleshooting
MELSEC System Q, Hardware 11 – 81
4600
SFCP. OPE. ERROR
The SFC program contains data that cannot be
processed.
 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/ON Flicker/
ON
Stop/
Continue
(can be set
in the
parameters
at error
occur-
rence)
Qn(H)
QnPH
QnPRH
4601
SFCP. OPE. ERROR
Exceeds device range that can be designated by
the SFC 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/ON Flicker/
ON
Stop/
Continue
(can be set
in the
parameters
at error
occur-
rence)
4602
SFCP. OPE. ERROR
The START instruction in an SFC program is pre-
ceded by an END instruction.
 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/ON Flicker/
ON
Stop/
Continue
(can be set
in the
parameters
at error
occur-
rence)
4610
SFCP. EXE. ERROR
The active step information at presumptive start
of the SFC program is incorrect.
 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.
The program is automatically subjected to an
initial start.
ON ON Continue Qn(H)
QnPH
QnPRH
4611
SFCP. EXE. ERROR
Key-switch was reset during RUN when pre-
sumptive start was designated for SFC program.
 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.
The program is automatically subjected to an
initial start.
ON ON Continue Qn(H)
QnPH
QnPRH
4620
BLOCK EXE. ERROR
Startup was executed at a block in the SFC pro-
gram that was already started up.
 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
QnPRH
4621
BLOCK EXE. ERROR
Startup was attempted at a block that does not
exist in the SFC 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
corresponding to its numerical value (pro-
gram error location), and correct the problem.
– Turn ON if the special relay SM321 is OFF.
OFF Flicker Stop Q00J/Q00/Q01
(Function
version is B or
later)
Qn(H)
QnPH
QnPRH
QnU
4630
STEP EXE. ERROR
Startup was executed at a block in the SFC pro-
gram that was already started up.
 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
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