Possible settings with LOGO!

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If you directly program your circuit program on the LOGO!, then you can only enter the gain and offset parameters. You can calculate the gain and offset as follows:

 

External value range minSensor - maxSensor

Range of a physical quantity that the sensor can measure.

 

Standardized value range minnorm - maxnorm:

Value range of the standardized values.

With sensors that provide 0 to 10 V or 0 to 20 mA, the standardized value range is 0 – 1000.

With sensors that provide 4 to 20 mA, the standardized range is 200 – 1000.

 

So for gain and offset it follows:

 

Gain = (maxSensor - minSensor) / (maxnorm – minnorm)

Offset = [(minSensor x maxnorm) – (maxSensor x minnorm)] / (maxnorm – minnorm)

 

If you have calculated either the gain or the offset in accordance with the formulas above, you can then calculate the respective other value in accordance with the following formula:

 

Gain = (minSensor - Offset) / minnorm

Offset = (minSensor – (Gain x minnorm)