17 PLC Advance S7 300 PLC Simatic manger S7 300 Analog Input Output FC105 FC106

In Siemens SIMATIC S7-300 PLC, the function blocks FC105 (Scale) and FC106 (Unscale) are typically used to handle analog input and output data. Here's an explanation of each:

FC105 (Scale)
This function is used to scale the raw analog input signals (which are usually in a range of 0 to 27648 or 0 to 27648 depending on the sensor) to engineering units (like temperature, pressure, etc.).

Parameters:
IN: The raw analog value from the analog input (e.g., a value between 0 and 27648).
HI_LIM: The upper limit of the engineering value (e.g., 100°C).
LO_LIM: The lower limit of the engineering value (e.g., 0°C).
BIPOLAR: Defines whether the signal is unipolar (set to 0) or bipolar (set to 1).
RET_VAL: Used for diagnostic purposes, where an error code can be returned if something goes wrong.
Example:
If you're converting an analog input from 4-20 mA to temperature range 0-100°C:

IN = raw analog value (e.g., 0-27648)
HI_LIM = 100
LO_LIM = 0
BIPOLAR = 0
FC106 (Unscale)
This function does the opposite of FC105: it converts a value in engineering units back to a corresponding raw analog output signal.

Parameters:
IN: The engineering value you want to convert back to raw (e.g., temperature).
HI_LIM: The upper limit of the raw analog output value.
LO_LIM: The lower limit of the raw analog output value.
BIPOLAR: Defines whether the signal is unipolar or bipolar.
RET_VAL: Used for error checking.
Example:
To output a temperature value (0-100°C) back to the analog output as a 4-20 mA signal:

IN = 0-100°C (engineering value)
HI_LIM = 27648
LO_LIM = 0
BIPOLAR = 0

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