Omron CJ1W-SCU32 Operation Manual page 311

Event code Event name
64A3 0000 hex FCS Check
Error
64A4 0000 hex Timeout
Error
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Meaning Assumed cause
One of the following • Noise
errors occurred in
• There was a mistake in the
the converted pro-
CRC code that was attached to
tocol at the serial
the command frame.
gateway.
• When converting
to CompoWay/F
command: BCC
error
• When converting
to Modbus-RTU
command: CRC
error
• When converting
to Modbus-ASCII
command: CRC
error
• When converting
to Host Link FINS
command: FCS
error
Protocol Macros
• The check code
attached to the
received mes-
sage does not
match the check
code that was
calculated from
the received mes-
sage.
A timeout error • The steps in the communica-
occurred. tions sequence of a protocol
macro are not progressing.
• There is no remote device to
receive the command.
• The command frame is incor-
rect.
• The remote device is not
using the same serial com-
munications settings.
• Wiring is not correct or termi-
nating resistance is not set
correctly.
• The remote device could not
interpret the protocol com-
mand.
• The response from the
remote device was sent too
soon.
• The response timeout moni-
toring time of the serial gate-
way is too short.
• The loopback test jig failed.
• The communications circuits
in the Serial Communica-
tions Unit are faulty.
• A serial gateway interrupted
processing between protocol
macro steps.
• Noise occurred.
• The Serial Communications
Mode setting is incorrect.
9 Troubleshooting and Maintenance
Level
Maj Prt Min Obs Info
√
√
Reference
page 9-43
page 9-44
9
9-33