hyster

 Function Block A function block groups an algorithm and a set of private data. It has inputs and outputs. - Hysteresis detection.

Inputs

Input	Data Type	Range	Unit	Default	Description
XIN1	REAL				First input.
XIN2	REAL				Second input.
EPS	REAL				Hysteresis.

Outputs

Output	Data Type	Range	Unit	Description
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.

FBD Language

FFLD Language

• In the FFLD language, the input rung (EN) is used for enabling the block.
  • The output rung is the Q output.
  • 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)
FFLD  MyHyst.Q
ST "Structured text"
A high-level language that is block structured and syntactically resembles Pascal  Q

ST Language

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

See Also

• average / averageL
• derivate
• integral
• lim_alrm
• stackint