If X exceeds the upper limit HIGH, the function block reports this status with IND = 1.

If X exceeds the lower limit LOW, the function block reports this status with IND = 0.

Function description

INDi = 1, if X > HIGH

INDi = 0, if X < LOW

otherwise

INDi = INDi-1

If LOW is greater than HIGH, no hysterisis is created and IND indicates that X is greater than HIGH.