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9-3
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-2
Com
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9-2-1 Status Area Error Inf
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9-2 Communications Status Error
Notification
This section describes the error information for the Device Variables for CJ-series Unit for status.
When an error occurs, the corresponding flag is set to TRUE.
9-2-1 Status Area Error Information
Device variable for CJ-series Unit Flag name Possible cause Remedy
Port 1 Port 2
*_Com_UnitLogMemErr Error Log EEPROM
Error The error log EEPROM is
faulty. If the problem persists even if the
power supply is cycled, replace the
Unit.
*_Com_UnitPmrDatErr Protocol Data Error A protocol data checksum
error occurred. If the error persists when protocol
data is retransmitted, replace the
Unit.
*_P1_SysSetupErr *_P2_SysSetupErr System Setup error A System Setup error
occurred. Correct the System Settings, reset
the Controller, or restart the Unit.
*_P1_RmtBusySta *_P1_RmtBusySta Remote Unit Busy The Remote Unit is in
reception buffer busy sta-
tus when flow control is
set for the protocol. Cancel the communications with the
Remote Unit until this flag is set to
FALSE.
*_P1_LclBusySta *_P2_LclBusySta Local Unit Busy The local Unit is in recep-
tion buffer busy status. Increase the transmission interval to
reduce transmission load to the
Remote Unit for which flow control is
set.