Hi,

hope this helps:

For an S7-1200/S7-1500 controller in STEP 7 (TIA Portal), how do you scale integer values in real numbers and vice versa for analog inputs and outputs?

Regards,

Towome

Since Siemens codes the provided SCALE instruction for S7-300/400/1500 PLCs in a closed-source manner, we cannot tell you what the code looks like.

We can (and someone kindly already did) provide you with the expected way to scale analog values for S7-1200/1500 using NORM_X to normalize a range of values to 0.0 to 1.0, and then provides SCALE_X to accept the normalized range of values and convert to either user units, engineering units, VFD units, HMI scaling units, and so on.  You can have a single NORM_X and provide that normalized output into several SCALE_X blocks to get several scaled values from the same source value.

That option can reduce the amount of normalization calculations the PLC is required to do (a bonus) - if multiple scaled outputs are needed.

amit_kumar2505

 Hlo Sir,

I am learning programming language. Si want to know logic of FC105 in ladder and STL.

Enclosed pic for the reference.

Ste39

NiAk

Hi,

I have connected pressure sensor of range 0-10 bar giving output of 4-20mA to the AI of the PLC of range 0-10V. With the help of 560 ohms i have converted the 4-20mA value into voltage.

Now, to show the pressure in bar how should I configure the FC105 block.

 Hello,

in IN put your input address, BIPOLAR= FALSE

 0-10V = 0-27648 (S7) in LO_LIM put 0.0 and in HI_LIM put 10.0

please have a look below:

Scaling and Unscaling Analog Values -Siemens

http://support.automation.siemens.com/WW/view/en/1765297

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