Alarm Trigger for Real Variables (v1.1)

Alarm Trigger for Real Variables (v1.1)

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

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

    alrTrig();
end_program

Inputs

Name	Data Type	Retain	Required to Connect	Meaning
Input	bool	No	Yes	Input value
Priority	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	No	No	Type of monitored event

Outputs

Name	Data Type	Meaning
Alarm	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.

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