Omron CJ1W-SCU32 Operation Manual page 322

9 Troubleshooting and Maintenance
Event name Timeout Error
Meaning A timeout error occurred.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
In Protocol Macro Mode (the SD@
indicator does not flash at all): The
Serial Communications Unit received
a command, but the step transition of
the protocol macro communications
sequence is suspended for one of the
following reasons.
• The next step is a RECEIVE com-
mand.
• A WAIT command is presently in
execution.
In Serial Gateway Mode or Protocol
Macro Mode (the SD@ indicator
flashes, but the RD@ does not flash):
• There is no remote device to
receive the command after conver-
sion at the specified destination
address.
• The sent command frame is illegal.
• The settings for the communica-
tions conditions and baud rate of
the serial communications path do
not match the remote device.
• The communications cable wiring is
faulty or incorrect, the terminating
resistance settings of the RS-
424A/485 port are incorrect, or the
adapter wiring or terminating resis-
tance settings for the NT-AL001 are
incorrect.
• The protocol of the sent command
was unable to be interpreted by the
remote device.
• Remote device hardware failure
9-44
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
Review the communications
sequence. Or, program retry process-
ing in the device that sent the com-
mand when response code 0204 hex
is received. If necessary, adjust the
Serial Gateway Send Start Timeout
Monitoring Time in the
*_P1_PmrSgwSendTimeoutCfg or
*_P2_PmrSgwSendTimeoutCfg
device variable.
• Check the device at the specified
destination address.
• Review the command frame to con-
vert.
• Review the system settings and the
settings of the remote device.
• Check the communications cable
connections. Turn ON the terminat-
ing resistance (with the terminating
resistance ON/OFF switch) at both
ends (at the remote device or at the
Unit).
• Check the command specifications
of the remote device and conver-
sion source.
• Replace the remote device.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Event code 64A4 0000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Perform countermeasures in
advance.
After serial com-
munications start
System