hyster

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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	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.

Output

Data Type

Range

Unit

Description

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 Example

FFLD Language Example

In the FFLD Language, the input rung (EN) is used for enabling Enable signal for the drive, Hardware-Enable with 24V signal to X8, Software-Enable command by setup Software, fieldbus or permanently set. Both are required for enabling the drive. the block.
- The output rung is the Q output.
- The block is not called if EN is FALSE.

IL Language Example

(* MyHyst is a declared instance of HYSTER function A function calculates a result according to the current value of its inputs. 
A function has no internal data and is not linked to declared instances. 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 Example

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