Usb Communication Error/Serial Communication Error; Modbus Rtu Communication Error - Mitsubishi Electric MELSERVO-JE Instruction Manual

1. SERVO AMPLIFIER TROUBLESHOOTING
Alarm No.: 8E Name: USB communication error/serial communication error/Modbus RTU communication error
Alarm content
Detail
Detail name
No.
8E.1 USB (1) The setting of the
communication
receive
error/serial
(2) A communication cable
communication
receive error
(3) The servo amplifier is
8E.2 USB (1) The setting of the
communication
checksum
error/serial
communication
checksum error
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
A communication error occurred between the servo amplifier and a personal computer or a controller.
An error occurred in USB communication, serial communication (Mitsubishi Electric general-purpose AC
servo protocol), or Modbus RTU communication.
Cause
Check the setting of
personal computer, etc. the personal
is incorrect. computer, etc.
Check the
is malfunctioning. communication cable,
and then check the
repeatability.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Check the setting of
personal computer, etc. the personal
is incorrect. computer, etc.
Check the character
character is out of code at the time of
specifications. transmission.
Check if transmission
protocol is failure. data conforms to 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 conforms to the
communication
protocol.
Check the setting of
personal computer, etc. the personal
is incorrect. computer, etc.
Check method Check result
It is incorrect.
It is repeatable.
It is not repeatable.
It is correct.
It is not repeatable.
It is incorrect.
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.
1 - 42
Action Target
Correct the settings. [A]
[B]
Check (2).
[C]
Replace the
communication
cable.
Check (3).
Replace the servo
amplifier.
Correct the settings.
Correct the
transmission data.
Check (2).
Modify the
transmission data
according to the
communication
protocol.
Check (3).
Correct the settings.
Correct the
transmission data.
Check (2).
Modify the
transmission data
according to the
communication
protocol.
Check (3).
Correct the settings.