3 Error Tables
3-138
NJ-series Troubleshooting Manual (W503)
64A50000 hex Comparison
Error
A comparison error
occurred.
• Loopback test jig failure.
• Noise
• The communications circuits in
the Serial Communications Unit
are faulty.
S CJ-series
Serial Com-
munications
Units Opera-
tion Manual for
NJ-series
CPU Unit (Cat.
No. W494)
64A60000 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.
S Same as
above.
64A70000 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.
S Same as
above.
84680000 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
S Same as
above.
84690000 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/SerialR-
cvNoClear instruction was
executed.
• During Loopback Test
• Loopback test jig failure.
• Noise
• The communications circuits
in the Ser
ial Communica
-
tions Unit are faulty.
S Same as
above.
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
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