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CPU Units Section 3-1
Note All nomenclature and functions other than those shown in the above diagram
are the same as for CJ1 and CJ1-H CPU Units.
Indicators The following table describes the LED indicators located on the front panel of
the CPU Units.
Indicator Color Status Meaning
RUN Green ON PLC is operating normally in MONITOR or RUN mode.
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.
ERR/ALM Red ON A fatal error has occurred (including FALS instruction execution), or a hardware
error (watchdog timer error) has occurred.
The CPU Unit will stop operating, and the outputs from all Output Units will turn
OFF.
Flashing A non-fatal error has occurred (including FAL instruction execution)
The CPU Unit will continue operating.
OFF CPU Unit is operating normally.
INH Orange ON Output OFF Bit (A50015) has been turned ON. The outputs from all Output Units
will turn OFF.
OFF Output OFF Bit (A50015) has been turned OFF.
PRPHL Orange Flashing CPU Unit is communicating (sending or receiving) via the peripheral port.
OFF CPU Unit is not communicating via the peripheral port.
COMM Orange Flashing CPU Unit is communicating (sending or receiving) via the RS-232C port.
OFF CPU Unit is not communicating via the RS-232C port.
BKUP
(CJ1-H CPU
Units only)
Orange ON User program and parameter area data is being backed up to flash memory in the
CPU Unit or being restored from flash memory.
Note Do not turn OFF the power supply to the PLC while this indicator is lit.
OFF Data is not being written to flash memory.
ERR/ALM
RUN
COMM
INH
PRPHL
BKUP
Indicator Color Status Meaning
MCPWR Green ON Power is being supplied to the Memory Card.
Flashing Flashes once: Easy backup read, write, or verify normal
Flashes five times: Easy backup write malfunction
Flashes three times: Easy backup write warning
Flashes continuously: Easy backup read or verify malfunction
OFF Power is not being supplied to the Memory Card.
BUSY Orange Flashing Memory Card is being accessed.
OFF Memory Card is not being accessed.
OPEN
PERIPHERAL
BUSY
MCPWR
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