Mitsubishi Electric MELSEC-Q Series User Manual page 306

Error code
Description
(hexadecimal)
B903 Transient request error
Communication buffer
B904
size setting error
Transient data length
B905
error
B981 and B982
B983
System error
B984
B985 to B987
B9FF
BA01 Error (hardware test)
BA02
System error
BA05
BA06 to BA13 Error (hardware test)
BA14 Error (hardware test)
BA15 Error (hardware test)
BA16 and BA17 Error (hardware test)
Corresponding station
BA19
error
BA1B Error in all stations
304
Error cause (details)
A transient request was issued to
a station that had not secured a
communication buffer.
When a dedicated instruction
was executed, the
communication buffer size of the
corresponding station was
outside the range.
When the dedicated instruction
was executed, the transient data
length was greater than the
communication buffer size of the
corresponding station.

A hardware error has been
detected.

A hardware error has been
detected.
A hardware (communication
circuit) error has been detected.
A hardware error has been
detected.
A hardware (communication
circuit) error has been detected.
The target station of the line test
cannot be communicated.
A communication failure has
occurred in all stations during
execution of the line test 1.
Corrective action
Secure a communication buffer
area using the parameter.
Set the communication buffer size
within the range.
Increase the communication
buffer size so that it may be
greater than the transient data
length.
Please consult your local
Mitsubishi representative.
Please consult your local
Mitsubishi representative.
Please consult your local
Mitsubishi representative.
Please consult your local
Mitsubishi representative.
• Check if the terminating resistor
provided with the master/local
module is connected between
the DA and DB terminals, and
execute the hardware test
again.
• If the same error persists after
taking the above action, please
consult your local Mitsubishi
representative.
Please consult your local
Mitsubishi representative.
• Check if the terminating resistor
provided with the master/local
module is connected between
the DA and DB terminals, and
execute the hardware test
again.
• If the same error persists after
taking the above action, please
consult your local Mitsubishi
representative.
Check the cables and the target
station.
Check the cables.
Delectability
Master Local
station station
×
×
×
×