====== Comparison with Hysteresis ======

{{:cs:mervis-ide:35-help:hysteresis.png}}

==== Full Name ====

Lib.Mervis.v1_0.Hysteresis

==== Required Project References ====

  * Lib.Mervis

===== Description =====

A helper block used for comparing two values with hysteresis between transitions.

===== Usage in ST =====

<code>
program test
    var
        hyst: lib.mervis.v1_0.Hysteresis;
    end_var

    hyst(Input := ..., SetPoint := ..., Hysteresis := 5);
end_program
</code>

===== Inputs =====

|Name       |Data Type|Retain|Mandatory Connection|Meaning|
|Input      |real     |No    |Yes                 |Input value|
|SetPoint   |real     |No    |Yes                 |Desired value|
|Hysteresis |real     |No    |No                  |Hysteresis|

===== Outputs =====

|Name   |Data Type|Meaning|
|Output |bool     |Output|

===== Detailed Function Description =====

The block compares two variables - //Input// and //SetPoint//. The output is set as follows:

  * __True__ - if //Input// rises above //SetPoint + Hysteresis//
  * __False__ - if //Input// falls below //SetPoint//