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9 Troubleshooting and Maintenance
9-34
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
64A5 0000 hex Comparison
Error A comparison error
occurred. • Loopback test jig failure.
• Noise
• The communications circuits in
the Serial Communications Unit
are faulty.
√
page 9-46
64A6 0000 hex Reception
Overflow More than the spec-
ified amount of
receive data was
received in No-pro-
tocol Mode.
• One or more bytes of data was
received after the completion
the reception.
√
page 9-46
64A7 0000 hex Command
Format Error An illegal function
code or address
was specified in a
received Modbus-
RTU command. • An illegal function code,
address, or data was specified
in a received Modbus-RTU
command.
√
page 9-47
8468 0000 hex Transmis-
sion Error A transmission
error occurred. • One of the following errors
occurred.
• Tfs (Send Finished Monitor-
ing Time) Exceeded
• Tfr (Receive Finished Moni-
toring Time) Exceeded
• Tr (Receive Wait Monitoring
Time) Exceeded
• FCS Check Error
• Command Error
• Timeout Error
• Overrun Error
• Framing Error
• Parity Error
√
page 9-47
8469 0000 hex Overrun
Error An overrun
occurred. • In Serial Gateway Mode or Pro-
tocol Macro Mode:
• The reception circuits in the
Serial Communications Unit
are faulty.
• A transmission error occurred
due to noise or other factors.
• No-protocol Mode:
• The reception buffer received
more than 259 bytes of data
before the SerialRcv/Serial-
RcvNoClear instruction was
executed.
• During Loopback Test
• Loopback test jig failure.
• Noise
• The communications circuits
in the Serial Communica-
tions Unit are faulty.
√
page 9-48
846A 0000 hex Framing
Error A frame error
occurred. • In Serial Gateway Mode or Pro-
tocol Macro Mode:
• The reception circuits in the
Serial Communications Unit
are faulty.
• A transmission error occurred
due to noise or other factors.
• During Loopback Test
• Loopback test jig failure.
• Noise
• The communications circuits
in the Serial Communica-
tions Unit are faulty.
√
page 9-49
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info