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9-49
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-5 Even
t L
ogs
9
9-5-3 Error De
scr
iptio
ns
Event name
Framing Error
Event code
846A 0000 hex
Meaning
A frame error occurred.
Source
PLC Function Module
Source details
CJ-series Unit
Detection
timing
After serial com-
munications start
Error attributes
Level
Observation
Recovery
---
Log category
System
Effects
User program
Continues.
Operation
Not affected.
System-defined
variables
Variable
Data type
Name
None
---
---
Cause and
correction
Assumed cause
Correction
Prevention
In Serial Gateway Mode or Protocol
Macro Mode:
•
The reception circuits in the Serial
Communications Unit are faulty.
•
A transmission error occurred due
to noise or other factors.
•
Perform a loopback test in the serial
communications mode and check
the transmission lines. If an error
occurs during testing, replace the
Serial Communications Unit.
•
Implement noise countermeasures.
Increase the setting for the number
of resends in the device that sent
the command. If required, perform
retry processing for communica-
tions.
Perform countermeasures in
advance.
During Loopback Test
•
Loopback test jig failure.
•
Noise
•
The communications circuits in the
Serial Communications Unit are
faulty.
•
Correct any mistakes in wiring the
loopback test jig.
•
Implement noise countermeasures.
•
Replace the Unit.
•
Check the wiring of the loopback
test jig.
•
Use the Unit away from sources of
noise. Implement noise counter-
measures.
Attached
information
Attached information 1: Port number where error was detected
Precautions/
Remarks
None
Содержание CJ1W-SCU22
Страница 192: ...4 Using Protocol Macros 4 56 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 250: ...6 No protocol Mode 6 22 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 460: ...A Standard System Protocol R 126 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 473: ...Index 1 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494 I Index...