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MELSEC-QnA
13 TROUBLESHOOTING
Table 13.1 Error code list (4/6)
Detectability Error code
(hexadecimal)
Error details Cause of error occurrence (details) Corrective action
Master station Local station
B510 2
Transmission channel in use
(host station)
A channel being used was used.
The same channel cannot be
used simultaneously. Change
the channel number, or try not
to use the same channel
simultaneously.
B511 2 Receive channel in use
The channel of the target station is in
use.
Wait for a while before
executing the SEND instruction
again. Check whether there are
multiple requests to the same
channel of the target station
from the local station or multiple
stations.
B512 2 Arrival wait time out
The arrival watchdog time has elapsed
(when the number of retransmission is 0),
or the RECV instruction was executed
even though the RECV instruction
execution request flag was not on.
When the error occurs with a
RECV instruction, increase the
value of arrival watchdog time if
other stations are executing
SEND instructions. If the local
station is executing instructions,
increase the value of arrival
watchdog time. If the error
persists, check the network and
the target station.
B513 2 Number of retries count over
When the send/receive instruction was
used, the number of retries exceeded the
set number.
Increase the arrival watchdog
time. If the error persists, check
the network and the target
station.
B515 2 Channel number error
The channel number is out of the setting
range.
Set the channel at the local and
target stations to either 1 or 2.
B518 2
Number of retransmissions
error
The number of retransmissions is out of
the setting range.
Set it in the range of 0 to 15
(times).
B519 2 Arrival watchdog time error
The arrival watchdog time is out of the
setting range.
Set it in the range of 0 to 32767
(seconds).
B51A Send data length error
The length of send data is out of the
setting range.
Set it within the range of "1 to
480 (words)".
B520 2
Transmission destination
station number error
The value "other than 0" is set for the
target station number.
Set the target station number to
"0."
B524 2
Transmission destination
station CPU error
There is an error in the CPU at the
transmission destination station.
Check the CPU of the
transmission destination station.
B601 1 Request type error An unsupported request was received.
Check the contents of the
request, as well as the target
station number.
B602 1
Transient request overload
error
There are too many transient requests to
the corresponding station.
Wait a while and then send the
requests (transient overload
status).
B603 1
Transient request overload
error
There are too many transient requests to
the corresponding station.
Wait a while and then send the
requests (transient overload
status).
B604 1 Line test in processing
Transient transmission was sent when a
line test was in progress.
Wait a while and then
retransmit.
B605 1
Transient storage buffer could
not be obtained
Transient storage buffer could not be
obtained.
Wait a while and then
retransmit.
B607 2 Target station CPU error
There is an error in the target station's
CPU.
Check the target CPU.
B771 2
Transient request overload
error
There are too many transient requests to
the corresponding station.
Wait a while and then
retransmit (transient overloaded
status).
B774 2 Transient request error
The target station was not an intelligent
device station.
Check if the target station is an
intelligent device station.
B778 2 Response time out
A response was not received from the
requested station.
Check the requested module
and cables.
B783 Transient storage buffer error
An error occurred in the transient storage
buffer when a transient transmission of
greater than 1 k was being performed.
Wait a while and then
retransmit.
1: Error code added to the function version B or later.
2: Error code added to the software version J (manufactured in Jan., 1998) or later.