3-139
3 Error Tables
NJ-series Troubleshooting Manual (W503)
3-1 Errors by Source
3
3-1-9 Errors in CJ-series Units
846A0000 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.
S CJ-series
Serial Com-
munications
Units Opera-
tion Manual for
NJ-series
CPU Unit (Cat.
No. W494)
846B0000 hex Parity Error A parity 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.
S Same as
above.
846C0000 hex Overrun
Error, Fram-
ing Error, or
Parity Error
(Transmis-
sion Error)
An overrun error,
framing error, or
parity error
occurred.
• The communications conditions
and baud rate settings do not
match the host.
• Noise or other external interfer-
ence.
• The baud rate is outside the
allowable range or there are bit
errors due to different stop bit
settings or other parameters.
• The communications cable wir-
ing is faulty.
• Terminating resistance is not
set correctly for the RS-
422A/485 ports.
• Wiring is faulty or terminating
resistance is not set correctly
on an NT-AL001 or other
Adapter.
S Same as
above.
846D0000 hex Transmis-
sion Error
(CRC Error)
A CRC error
occurred.
• Noise
• CRC calculation method does
not match the device.
S Same as
above.
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
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