Switch Block - Desired Value Switcher

Switch Block - Desired Value Switcher

Full Name

Lib.Mervis.v1_0.SwitcherBlockValue

Required Project References

Lib.Mervis

Description

A helper block used, in combination with a switch block, for switching the desired value.

Usage in ST

program test
    var
        switcherblock: lib.mervis.v1_1.SwitcherBlock;
        switchervalue: lib.mervis.v1_0.SwitcherBlockValue;
    end_var

    switcherblock();
    switchervalue(CompositeState := switcherblock.CompositeState);
end_program

Example Usage in FBD

Inputs

Name	Data Type	Retain	Mandatory Connection	Meaning
Demand	real	No	Yes	Desired value in automatic mode
CompositeState	uint	No	Yes	Output CompositeState from the control switch block
OffDemand	real	No	No	Demand value in the off state
ManualDemand	real	Yes	No	Desired value when manually turned on

Outputs

Name	Data Type	Meaning
Command	real	Command

Detailed Function Description

The block is used for selecting the control value when switching a device (e.g., a continuous demand for a frequency converter). If the device (or its switch block) is in automatic mode and has an operational demand, the Demand input value is copied to the Command output. In the case of manual activation, the ManualDemand value is copied to the Command output. In the off state (no demand or the device is manually turned off), the OffDemand value is copied to the Command output.

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