How to convert PIW status word to a percentage on HMI?

Benm4115

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Oct 2011
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Hi,

Im having a practice with a Siemens MM420, using siemens S7 via profibus, im struggling with the status PIW speed ref. I want to convert this figure decimal or hex displayed on HMI into a percentage reading any tips or help with the code required.
Thanks
 
I think LD's suggestion is the better one.
FC105 SCALE assumes that the raw unscaled range is from 0-27648 (or 5530-27648 for 4-20mA). This is the range from standard S7 analog inputs.
If the raw unscaled value from the MM420 does not fit into that, then you cannot use FC105 SCALE.
 

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