HYSTER

Function Block - Hysteresis detection.

Inputs

XIN1 : REAL  First input signal
XIN2 : REAL  Second input signal
EPS : REAL   Hysteresis

Outputs

Q : BOOL     Detected hysteresis: TRUE if XIN1 becomes greater than XIN2+EPS and is not yet below XIN2-EPS

Remarks

The hysteresis is detected on the difference of XIN1 and XIN2 signals. In LD language, the input rung (EN) is used for enabling the block. The output rung is the Q output.

ST Language

(* MyHyst is a declared instance of HYSTER function block *)
MyHyst (XIN1, XIN2, EPS);
Q := MyHyst.Q;

FBD Language

LD Language

(* The block is not called if EN is FALSE *)

IL Language:

(* MyHyst is a declared instance of HYSTER function block *)
Op1: CAL MyHyst (XIN1, XIN2, EPS)
     LD  MyHyst.Q
     ST  Q

See also

AVERAGE   INTEGRAL   DERIVATE   LIM_ALRM   STACKINT