Provided by standard library.

The function block Timer is a trigger. TP(IN, PT, Q, ET) means:

IN and PT are input variables of the BOOL and TIME types respectively. Q and ET are output variables of the BOOL and TIME types respectively. If IN is FALSE, Q is FALSE and ET is 0.

As soon as IN becomes TRUE, the time will begin to be counted in milliseconds in ET until its value is equal to PT. It will then remain constant.

Q is TRUE as from IN has got TRUE and ET is less than or equal to PT. Otherwise it is FALSE.

Q returns a signal for the time period given in PT.

Graphic display of the TP time sequence.

Example in Function Block Diagram

Example in Structured Text

TPInst(IN := VarBOOL1, PT:= T#5s);

VarBOOL2 :=TPInst.Q;