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9-45
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
Cause and
correction
Assumed cause
Correction
Prevention
In Serial Gateway Mode or Protocol
Macro Mode (RD
@
/SD
@
indicator
flashes):
•
The response from the remote
device was too fast, and the data
received by the Serial Communica-
tions Unit was discarded.
•
The Serial Gateway Response Tim-
eout Monitoring Time for the
*_P1_PmrSgwRespTimeoutCfg or
*_P2_PmrSgwRespTimeoutCfg
device variable is too short.
•
Delay the remote device response.
•
Set a longer Serial Gateway
Response Timeout Monitoring Time
in the
*_P1_PmrSgwRespTimeoutCfg or
*_P2_PmrSgwRespTimeoutCfg
device variable.
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.
A serial gateway cannot interrupt pro-
cessing between protocol macro
steps.
Perform retry processing for sending
commands or review the communica-
tions sequence.
Perform countermeasures in
advance.
If the message frame is corrupted due
to noise, a response timeout occurred
at the FINS send source if the
*_P1_TimeoutErr or
*_P2_TimeoutErr device variable is
FALSE.
Check the noise conditions between
nodes. Increase the setting for the
number of resends in the device that
sent the command. If required, per-
form retry processing for communica-
tions.
A no-protocol instruction was exe-
cuted when No-protocol Mode was
not set.
Set the serial communications mode
to 3 hex (No-protocol Mode).
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...