SMC Networks LECSN-T Series User Manual

8. TROUBLESHOOTING
8 - 52
Alarm No.: 8E
Name: USB communication error/serial communication error/Modbus RTU communication error
Alarm content
・A communication error occurred between the driver and a personal computer/controller.
・An error occurred in USB communication, serial communication (Mitsubishi Electric general-
purpose
・
AC servo protocol), or Modbus RTU communication.
Detail
No.
Detail name
Cause
Check method
Check result
Action
8E.1
USB
communication
receive error/
serial
communication
receive error
(1)
The setting of the
personal computer, etc.
is incorrect.
Check the setting of
the personal computer,
etc.
It is incorrect.
Review the settings.
It is correct.
Check (2).
(2)
A communication cable
is malfunctioning.
Check the
communication cable,
and then check the
repeatability.
It is not repeatable.
Replace the
communication cable.
It is repeatable.
Check (3).
(3)
The driver is
malfunctioning.
Replace the driver, and
then check the
repeatability.
It is not repeatable.
Replace the driver.
8E.2
USB
communication
checksum error/
serial
communication
checksum error
(1)
The setting of the
personal computer, etc.
is incorrect.
Check the setting of
the personal computer,
etc.
It is incorrect.
Review the settings.
8E.3
USB
communication
character error/
serial
communication
character error
(1)
The transmitted
character is out of
specifications.
Check the character
code at the time of
transmission.
The transmitted
character is out of
specifications.
Correct the transmission
data.
The transmitted
[RJ010]
character is within
specifications.
Check (2).
(2)
The communication
protocol is failure.
Check if transmission
data supports the
communication
protocol.
It is not conforming.
Replace the
communication cable.
It is conforming.
Check (3).
(3)
The setting of the
personal computer, etc.
is incorrect.
Check the setting of
the personal computer,
etc.
It is not repeatable.
Replace the driver.
8E.4
USB
communication
command error/
serial
communication
command error
(1)
The transmitted
command is out of
specifications.
Check the command at
the time of
transmission.
The transmitted
command is out of
specifications.
Correct the transmission
data.
The transmitted
command is within
specifications.
Check (2).
(2)
The communication
protocol is failure.
Check if transmission
data supports the
communication
protocol.
It is not conforming.
Modify the transmission
data according to the
communication protocol.
It is conforming.
Check (3).
(3)
The setting of the
personal computer, etc.
is incorrect.
Check the setting of
the personal computer,
etc.
It is incorrect.
Review the settings.
8E.5
USB
communication
data number
error/serial
communication
data number
error
(1)
The transmitted data
number is out of
specifications.
Check the data number
at the time of
transmission.
The transmitted data
number is out of
specifications.
Correct the transmission
data.
The transmitted data
number is within
specifications.
Check (2).
(2)
The communication
protocol is failure.
Check if transmission
data supports the
communication
protocol.
It is not conforming.
Modify the transmission
data according to the
communication protocol.
It is conforming.
Check (3).
(3)
The setting of the
personal computer, etc.
is incorrect.
Check the setting of
the personal computer,
etc.
It is incorrect.
Review the settings.

SMC Networks LECSN-T Series Specifications

General

Brand	SMC Networks
Model	LECSN-T Series
Category	Controller
Language	English