ExST Assignment: R=

When the operand of the Reset assignment switches to ‎TRUE‎, then ‎FALSE‎ is assigned to the variable to the left of the operator. The variable is reset.

‎<variable name> R= <operand name> ;‎

The variables and the operand have the data type ‎BOOL‎.

Example

VAR
        xOperand: BOOL := FALSE;
        xResetVariable: BOOL := TRUE;
END_VAR

xResetVariable R= xOperand;

When the operand ‎xOperand‎ switches from ‎FALSE‎ to ‎TRUE‎, then ‎FALSE‎ is also assigned to the variable ‎xResetVariable‎. But then the variable keeps its state, even if the operand continues to change its state.

Multiple assignments