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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Special functions
LOGO!Soft Comfort Online Help
Operating Instructions, 11/2017
313
Several steps are required for LOGO! to process physical quantities:
1. LOGO! can read in electric voltages from 0 V to 10 V or electric currents from 0 mA to 20
mA to one analog input.
The physical quantities (for example, temperature, pressure, speed etc.) must therefore
be converted into one electric quantity. This conversion is performed by an external
sensor.
2. LOGO! reads in the electric quantity and, with further processing, converts it into a
standardized value within the range 0 to 1000. This value is then used in the circuit
program as the input of an analog special function.
3. In order to adapt the standardized value to the application, LOGO! uses an analog special
function, while taking into consideration the gain and offset, to calculate the analog value.
The analog value is then evaluated by the special function (for example, analog
amplifier). If an analog special function has an analog output, then the analog value is
used as the output of the special function.
4. With the LOGO! you can also convert analog values back into an electric voltage. In
doing so, the voltage can adopt values between 0 V and 10 V.
5. Using this voltage, LOGO! can control an external actuator, which converts the voltage
and also the analog value back into a physical quantity.
The following diagram illustrates this order of events.
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