Mitsubishi Electric MELSEC-Q Series User Manual page 304

Error code
Description
(hexadecimal)
B419 to B41A System error
B601 Request type error
Transient request
B602 and B603
overload error
B604 Line test in progress
Transient storage
B605 buffer data failed to be
obtained
B606 System error
Target station CPU
B607
error
Transient transmission
B608 target station mode
setting error
B60C
System error
B700
Transient transmission
B701 to B704
failure
B705 and B706 System error
Transient request
B771
overload error
B772 and B773 System error
B774 Transient request error
B775 to B777 Transient type error
B778 Response timeout
B779 System error
Module mode setting
B780
error
B781 System error
302
Error cause (details)

An unsupported request was
received.
Too many transient requests
were sent to the corresponding
station.
Transient transmission was
performed during a line test.
The transient storage buffer data
was failed to be obtained.

The CPU module on the target
station is in error.
Transient transmission was
performed to the AJ61BT11 or
A1SJ61BT11 in the I/O mode.

Transient transmission failed.

Too many transient requests
were sent to the corresponding
station.

The target station was not an
intelligent device station.
Unsupported transient data was
received.
A response has not been
received from the request
destination.

Transient transmission was
performed although the I/O mode
had been set for the target
station.

Corrective action
Please consult your local
Mitsubishi representative.
Check the request data and the
target station number.
Wait for a while and send the
request again.
Wait for a while and send the
request again.
Wait for a while and send the
request again.
Please consult your local
Mitsubishi representative.
Check the CPU module.
Set the intelligent mode for the
target station.
Please consult your local
Mitsubishi representative.
• Reduce the load placed on the
transient transmission and
perform the transmission again.
• If the same error persists after
taking the above action, please
consult your local Mitsubishi
representative.
Please consult your local
Mitsubishi representative.
Wait for a while and send the
request again (overload due to
many transient requests).
Please consult your local
Mitsubishi representative.
Check if the target station is an
intelligent device station.
Check the application of the
request source.
Check modules and cables at the
request destination.
Please consult your local
Mitsubishi representative.
Set the intelligent mode for the
target station.
Please consult your local
Mitsubishi representative.
Delectability
Master Local
station station
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