====== Alarm Trigger for Real Variables (v1.1) ======

{{:en:mervis-ide:35-help:real_to_alrtrig.png}}

==== Full Name ====

Lib.Mervis.v1_1.real_to_alrtrig

==== Required Project References ====

  * Lib.Mervis

===== Description =====

Auxiliary block used for generating an alarm from a real variable.

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

<code>
program test
    var
        alrTrig: lib.mervis.v1_1.real_to_alrtrig;
    end_var

    alrTrig();
end_program
</code>

===== Inputs =====

|Name                                                      |Data Type|Retain|Required to Connect|Meaning|
|Input      |bool                                                      |No        |Yes   |Input value                 |      |
|Priority   |[[..:..:alarms_alarmprioritytype.htm|AlarmPriorityType]]  |No        |No    |Alarm class                 |      |
|LowLimit   |real                                                      |No        |No    |Lower allowable value       |      |
|HighLimit  |real                                                      |No        |No    |Upper allowable value       |      |
|Hysteresis |real                                                      |No        |No    |Hysteresis around limit values|      |
|Delay      |time                                                      |No        |No    |Alarm delay                 |      |
|TriggerType|[[..:realalarmtriggertype.htm|RealAlarmTriggerType]]      |No        |No    |Type of monitored event     |      |

===== Outputs =====

|Name                             |Data Type|Meaning|
|Alarm  |[[..:alarmtrigger.htm|AlarmTrigger]]|Output    |      |

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

The block generates an alarm if the //Input// is outside the defined range. The alarm is activated when the condition specified by the //TriggerType// parameter is met.

|Condition  |Condition for Activation                                     |Condition for Deactivation                                                                     |
|LowAndHigh|//Input// < //LowLimit// or //Input// > //HighLimit//|//Input// > //LowLimit + Hysteresis// and //Input// < //HighLimit - Hysteresis//|
|Low       |//Input// < //LowLimit//                               |//Input// > //LowLimit + Hysteresis//                                                  |
|High      |//Input// > //HighLimit//                              |//Input// < //HighLimit - Hysteresis//                                                |

If a delay is set, the condition for activation must be met for at least this defined period.

===== Versions =====

{{indexmenu>.020-real_to_alrtrig#2}}