8.1 Self-diagnosis Function
8.1.1 Operation Monitor LEDs of 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 operation monitor LEDs on the Control Unit vary, as
shown in the table below.
■
LEDs related to self-diagnostic errors
LED display
Description
Operation
status
RUN PROG. ERR.
In normal
condition
ON OFF OFF Normal operation Operating
OFF ON OFF
Program 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
"RUN" and "PROG." LEDs flash alternately.
Operating
In
abnormal
condition
ON OFF Flashes Self-diagnostic error (During operation) Operating
OFF ON Flashes Self-diagnostic error (During stop) Stop
OFF ON ON System watchdog timer has been activated Stop
8.1.2 Operation Mode When an Error Occurs
● Normally, when an error occurs, the operation stops.
● For some errors, the user may select whether operation is to be continued or stopped by
setting the system registers.
■
"PLC Configuration" dialog box of FPWIN GR7
To specify the steps to be taken by the FPWIN GR7 if a PLC error occurs, select Option
(O)>PLC System register settings from the menu bar, and click on the "Action on Error" tab.
The screen shown below is displayed.
8.1 Self-diagnosis Function
8-2 WUME-FPXHPOSG-01
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