13.1 Self-Diagnostic function
13.1.1 LED Display for Status Condition
Status indicator LEDs on control unit
• The control unit has a self-diagnostic function which
identifies errors and stops operation if necessary.
• When an error occurs, the status of the status indicator
LEDs on the control unit vary, as shown in the table above.
Description
Operation
status
RUN PROG.
ERROR/
Normal
condition
Light (on) Off Off Normal operation Operation
Off Light (on) Off
PROG. mode
LED does not flash even if the forcing
output is performed in program mode.
Stop
Flashes Flashes Off
Forcing input/output in Run mode
Flashes RUN and PROG. LED
alternately.
Operation
Abnormal
condition
When a self-diagnostic error occurs
Off Light (on) Flashes When a self-diagnostic error occurs Stop
Light (on)
System watchdog timer has been
Stop
Status indicator LEDs on expansion FP0 adapter
Light (on) Light (on) Off Normal operation
Abnormal
condition
FP0 expansion unit is not connected.
Light (on) Light (on) Flashes
The FP0 expansion unit, that had been connected
when the power supply for the FP-X control unit
turned on, came away.
An error has occurred in the communication of data
between the expansion FP0 adapter and FP0
expansion unit due to noise, etc.
Light (on) Off Off
The expansion FP0 adapter turned on later than the
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