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MELSEC-QnA
13 TROUBLESHOOTING
Table 13.1 Error code list (3/6)
Detectability Error code
(hexadecimal)
Error details Cause of error occurrence (details) Corrective action
Master station Local station
B391
Retry count setting error
(parameter)
The retry count parameter (address 2
H)
was set to a value other than "1 to 7".
Set a value within the range
from "1 to 7".
B392
Operation when CPU is down
specified error (parameter)
The operation when the CPU is down
specification parameter (address 6H) was
set to a value other than "0 or 1".
Set "0 or 1".
B393
Scan mode specification error
(parameter)
The scan mode parameter (address 7
H)
was set to a value other than "0 or 1".
Set "0 or 1".
B394
Number of automatic return
stations setting error
(parameter)
The number of automatic return stations
parameter (address 3H) was set to a
value other than "1 to 10".
Set a value within the range
from "1 to 10".
B396
Station number overlap error
(parameter)
A duplicate station number was specified
with the station information parameter
(address 20
H to 5FH).
Set so that station numbers are
not duplicated.
B397
Station information setting error
(parameter)
The station information parameter
(address 20
H to 5FH) setting does not
meet the following condition:
(16
A) + (54 B) + (88 C)
<
2304
A: Number of remote I/O stations
B: Number of remote device stations
C: Number of intelligent device stations
(including local stations)
Set the parameter so that it
meets the condition shown on
left.
B398
Number of occupied stations
setting error (parameter)
The number of occupied stations in the
station information parameter (address
20
H to 5FH) was set to a value other than
"1 to 4".
Set a value within the range
from "1 to 4".
B399
Number of connected modules
setting error (parameter)
The number of connected modules
parameter (address 1H) was set to a
value other than "1 to 64".
Set a value within the range
from "1 to 64".
B39A 1
Standby master station
specification error (loading
status)
The status setting switch of the station
number different from that specified with
the parameter is set in the standby
master station.
Confirm the parameter or status
setting switch.
B39B
Reserved station setting error
(parameter)
The parameter's reserve station
specification is set to all reserve stations.
Check the parameter's reserve
station specification.
B39C 1
Standby master station setting
error
The station information of the station
number specified as the standby master
station has been set to other than the
intelligent device station.
Correct the station information
of the station specified as the
standby master station to be
the intelligent device station.
B401 1 Parameter change error
Parameter change was executed during
transient request.
Change the parameter after all
transient requests are
completed or before any are
requested.
B404 1 Response error
A response from the requested station
was not returned within the watchdog
time period.
Set a longer watchdog time. If
an error persists, check the
requested module and cables.
B405 1
Transient applicable station
error
A transient request was made to a
remote I/O station or a remote device
station.
Set the corresponding station to
a local station or an intelligent
device station.
B406 1 RY simultaneous ON error
RY is turned ON before the response is
complete, or a request is issued without
turning RY off.
After the response is complete,
always turn RY off before
sending a request.
B407 1
Transient communication
number unmatched error
The request data number is different from
the response data number.
Check the line.
1: Error code added to the function version B or later.