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This will depend on the controller that you are using and the communication method that you are using with Citect. The Analog Device DDT's in the Modicon M580 have a FORCED Status. If you are using the Schneider Electric OPC DA or UA server, you can gain access to this information directly.
This is a screen capture from the Analog Input Module.
This is a screen capture form the Analog Output Module.
For the Digital Input and Output you will need to use the IS_BIT_FORCED EF to detect the force status.
In addition, System Words %SW108 and %SW109 will provide a count of the number of forced digital and analog channels in the application.
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