s7-300 analog reading

I'm using FC105 Scaling block for analog periphery reading.Are there any reading difference of betweens voltage,current,resistor,thermocouple for scaling?
That is ;is it enough directly PIW using?.. Thanks in advance...

Here are some results from the "Grosse S'" -support pages:

http://support.automation.siemens.com/WW/view/en/22721771

Kalle

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Siemens works with an input integer from 0 to 27648. This can correspond with 0 to 10V, 4 to 20mA, 0 to 20mA, depending on what your settings are in the hardware config.

More can be readed on the page KalleOlle has given.

The FC105 only does a simple math calculation.
It devides PIW by 27648 and then multiplies by your range and adds an offset.

Formula from Siemens manual:
OUT = [ ((FLOAT (IN) – K1)/(K2–K1)) * (HI_LIM–LO_LIM)] + LO_LIM

tulip said:

I'm using FC105 Scaling block for analog periphery reading.Are there any reading difference of betweens voltage,current,resistor,thermocouple for scaling?
That is ;is it enough directly PIW using?.. Thanks in advance...

Click to expand...

You can use FC105 for voltage and current inputs as mentioned above, but the thermocouple inputs are usually scaled directly in 1/10°C.

In other words an input value of 279 is equivalent to 27.9°C.