Description

Function description

The UNFORCE_BIT function unforces a located EBOOL variable. If the variable is not forced, this EF has not effect.

The additional parameters EN and ENO can be configured.

NOTE: The behaviour of UNFORCE_BIT function depends on the state of %S79 system bit.

NOTE: The behavior of forced outputs (%M) is different for Modsoft/NxT/Concept and Control Expert.

With Modsoft/NxT/Concept you cannot force outputs when the Memory Protect switch of the Quantum CPU is set to the "On" position.

With Control Expert you can force outputs even when the Memory Protect switch of the Quantum CPU is set to the "On" position.
With Modsoft/NxT/Concept, forced outputs maintain their values following to a cold start.

With Control Expert, forced outputs lose their values following to a cold start.

WARNING

UNEXPECTED VARIABLE BEHAVIOR

Ensure that the behavior of the forced outputs is consistent with the application.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Representation:

CAL UNFORCE_BIT (IN := Input)

Representation:

UNFORCE_BIT (IN := Input);

The following table describes the input parameter:

Parameter	Type	Comment
`Input`	`EBOOL`	Variable to be unforced, should be a located EBOOL.