Mitsubishi Electric MELSERVO-J4 Instruction Manual page 97

1. TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
Alarm No.: 8E Name: USB communication error/serial communication error/Modbus-RTU communication error
Alarm content
Detail
Detail name
No.
8E.3 USB (1) The transmitted
communication
character
error/serial
communication
character error
(2) The communication
(3) The setting of the
8E.4 USB (1) The transmitted
communication
command
error/serial
communication
command error
(2) The communication
(3) The setting of the
8E.5 USB (1) The transmitted data
communication
data number
error/serial
communication
data number
error
(2) The communication
(3) The setting of the
A communication error occurred between the servo amplifier and a personal computer/controller.
An error occurred in USB communication, serial communication (Mitsubishi general-purpose AC servo
protocol), or Modbus-RTU communication.
Cause
Check the character
character is out of code at the time of
specifications. transmission.
Check if transmission
protocol is failure. data supports the
communication
protocol.
Check the setting of
personal computer, etc. the personal
is incorrect. computer, etc.
Check the command
command is out of at the time of
specifications. transmission.
Check if transmission
protocol is failure. data supports the
communication
protocol.
Check the setting of
personal computer, etc. the personal
is incorrect. computer, etc.
Check the data
number is out of number at the time of
specifications. transmission.
Check if transmission
protocol is failure. data supports the
communication
protocol.
Check the setting of
personal computer, etc. the personal
is incorrect. computer, etc.
Check method Check result
The transmitted
character is out of
specifications.
The transmitted
character is within
specifications.
It is not conforming.
It is conforming.
It is incorrect.
The transmitted
command is out of
specifications.
The transmitted
command is within
specifications.
It is not conforming.
It is conforming.
It is incorrect.
The transmitted
data number is out
of specifications.
The transmitted data
number is within
specifications.
It is not conforming.
It is conforming.
It is incorrect.
1 - 90
Action Target
Correct the [A]
transmission data. [B]
[WB]
[RJ010]
Check (2).
Modify the
transmission data
according to the
communication
protocol.
Check (3).
Review the settings.
Correct the [A]
transmission data. [B]
[WB]
[RJ010]
Check (2).
Modify the
transmission data
according to the
communication
protocol.
Check (3).
Review the settings.
Correct the [A]
transmission data. [B]
[WB]
[RJ010]
Check (2).
Modify the
transmission data
according to the
communication
protocol.
Check (3).
Review the settings.