Function: This command resets all values of variables from the selection <Device.Application> to predefined values permanently.
Call:
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Context menu of the application in the device tree
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Context menu in the editor of a POU from the selected application
Requirement: The application is in online mode.
CAUTION
Unusual changes to variable values in an application currently running on the controller can lead to undesired behavior of the controlled machinery.
Evaluate possible dangers before forcing variable values. Take the respective safety precautions. Depending on the controlled machinery, the result may lead to damage to machinery and equipment or injury to health and life of personnel.
With this command, CODESYS permanently sets one or more variables of the active application to defined values on the PLC. This is done at the beginning and end of a processing cycle. Order of processing: 1) read inputs, 2) force values, 3) process code, 4) force values, 5) write outputs.
You can prepare values as follows:
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Click in the “Prepared value” field in the declaration part and type in the value. For Boolean variables, you change the value by clicking the field.
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Click in the inline monitoring field in the implementation part of the FBD/LD/IL editor
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Click in the “Prepared value” field in the monitoring view and type in the value.
A forced value is marked with the forced symbol (
).
CODESYS forces the value until you explicitly lift it by
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Clicking “Unforce Values”
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Clicking “Unforce All Values from <Device.Application>”
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Lifting the force in the “Prepare Value” dialog
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Logging out of the application
The command “Force Values [All Applications]” affects all application in the project and is not included in a menu by default.