====== Three-State Boolean Input ======

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

==== Full Name ====

Lib.Mervis.v1_0.ThreeStateBool

===== Description =====

A helper block used to implement a BOOL input with the ability to indicate that the input is not connected in the software - in this case, it outputs the value of //UnconnectedValue//.

==== Required Project References ====

  * Lib.Mervis

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

<code>
program test
    var
        inp: lib.mervis.v1_0.ThreeStateBool;
    end_var

    inp();
end_program
</code>

===== Inputs =====

^ Name ^ Data Type ^ Retain ^ Mandatory Connection ^ Meaning ^
| Input | usint | No | Yes | Input - can directly connect a BOOL value. It can have the following values: \\ 0 - Input inactive \\ 1 - Input active \\ 2 - Input not connected (default value)  |
| UnconnectedValue | bool | No | No | Output value when Input = 2 |

===== Outputs =====

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