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7.2 How to make a regulator ON-OFF

The purpose of this example is to introduce how to develop a program with ISaGRAF; this

first example will be developed with the ST language.

Our target is to create a Regulator ON-OFF for Compressor (Direct Action).

The diagram of this regulator is:

The meaning of this diagram is:

• IF Temperature is higher than SET+BAND the compressor is ON

• IF Temperature is lower than SET the compressor is OFF

With these information is clear that our VARIABLES are:

• Temperature, type DINT

• SET, type DINT

• BAND, type DINT

• Compressor, type BOOL

Now we can create a new variable group:

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Emerson iPro SERIES Bedienungsanleitung Seite 41