TMD

Function Block - Down-counting stop watch.

Inputs

IN : BOOL The time counts when this input is TRUE
RST : BOOL Timer is reset to PT when this input is TRUE
PT : TIME Programmed time

Outputs

Q : BOOL Timer elapsed output signal
ET : TIME Elapsed time

Time diagram

Remarks

The timer counts up when the IN input is TRUE. It stops when the programmed time is elapsed. The timer is reset when the RST input is TRUE. It is not reset when IN is false.

ST Language

(* MyTimer is a declared instance of TMD function block *)
MyTimer (IN, RST, PT);
Q := MyTimer.Q;
ET := MyTimer.ET;

FBD Language

LD Language

IL Language:

(* MyTimer is a declared instance of TMD function block *)
Op1: CAL MyTimer (IN, RST, PT)
     LD MyTimer.Q
     ST Q
     LD MyTimer.ET
     ST ET

TMD