Cpu Unit Status Indicators - Omron CJ2 CPU UNIT User Manual

3 Nomenclature and Functions

CPU Unit Status Indicators

Indicators on front
of CPU Unit
The CJ2 CPU Unit status can be checked with the indicators at the top of the front panel of the Unit.
The following table describes these indicators.
Indicator
RUN Green
ERR/ALM Red
INH Yellow
PRPHL Yellow
*1 Yellow
COMM
BKUP Yellow
*1 The CJ2M-CPU3@ does not have this indicator.
*2 Do not turn OFF the power supply to the PLC while this indicator is lit.
3-4
Color Status
ON Lights when the PLC is operating normally in MONITOR or RUN
mode. The program is being executed.
Flashing System download mode error or DIP switch settings error.
OFF PLC has stopped operating while in PROGRAM mode, or has
stopped operating due to a fatal error, or is downloading data from
the system.
ON A fatal error (including FALS(007) instruction execution) or a hard-
ware error (watchdog timer error) was found in self-diagnosis.
The CJ2 CPU Unit will stop operating, and the outputs from all
Output Units will turn OFF.
Flashing A non-fatal error was found (including FAL(006) instruction execu-
tion) in the self-diagnosis.
The CJ2 CPU Unit will continue operating.
OFF The CJ2 CPU Unit is operating normally.
ON Output OFF Bit (A500.15) has been turned ON.
The outputs from all Output Units will turn OFF.
OFF Output OFF Bit (A500.15) has been turned OFF.
Flashing The CJ2 CPU Unit is communicating (sending or receiving) via the
peripheral (USB) port.
OFF The CJ2 CPU Unit is not communicating via the peripheral (USB)
port.
Flashing The CJ2 CPU Unit is communicating (sending or receiving) via the
serial port (RS-232C).
OFF The CJ2 CPU Unit is not communicating via the serial port
(RS-232C).
ON User program and parameter area data is being backed up to
flash memory in the CPU Unit or being restored from flash mem-
ory after the power supply to the PLC was turned ON.
OFF Data is not being written to flash memory.
7-segment display and
indicators for
EtherNet/IP port
(Refer to 3-1-2
Built-in EtherNet/IP Section.)
(CJ2H-CPU6@-EIP and
CJ2M-CPU3@ only.)
Meaning
*2
CJ2 CPU Unit Hardware User's Manual