Omron CJ2 CPU UNIT - Communications Error (Peripheral (USB) Port); Communications Error (Serial Port (RS-232 C))

6-11
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-1 CPU Unit Errors
6
6-1-7 Handling Errors
A communications error will occur if there is an error in communications between the peripheral (USB)
Port and a connected device.
z Error Causes and Remedies
A communications error will occur if there is an error in communications between the serial (RS-232C)
port and a connected device.
z Error Causes and Remedies
Communications Error (Peripheral (USB) Port)
POWER RUN ERR/ALM PRPHL COMM Error flag Error code Error information
Lit. Lit. Not lit. Not lit. Not lit. None None None
Suspected cause of
error
Confirmation method Remedy
Prevention of recur-
rence
The communications
cable is disconnected.
Perform a visual inspec-
tion and pull on the cables.
Reconnect the cables. During operation, confirm
that the connections are
secure. Check for vibration
or shock.
Communications Error (Serial Port (RS-232C))
POWER RUN ERR/ALM PRPHL COMM Error flag Error code Error information
Lit. Lit. Not lit. Not lit. Not lit. None None None
Suspected cause of
error
Confirmation method Remedy
Prevention of recur-
rence
Communications set-
tings are incorrect.
• Check whether the DIP
switch pin 5 setting and
and the serial port settings
in the PLC Setup are cor-
rect.
• If a host computer is con-
nected, check the host
computer serial port set-
tings and the program.
• Correctly set DIP switch
pin 5 and the serial port
settings in the PLC Setup.
• Correct the host computer
serial port settings and the
program.
Same as at the left.
A communications
cable is incorrectly
connected.
• Check the cable connec-
tions.
• Correct the cable connec-
tions.
Same as at the left.
A communications
cable is disconnected.
Perform a visual inspection
and pull on the cables.
Reconnect the cables. During operation, confirm
that the connections are
secure. Check for effects
of vibration or shock.