Analog scale conversions
Analog scale conversions
(OP)
Presently, I input a 4-20 mA signal into my DCS which represents 0 to 700 MW. I need to retransmit that signal over a communication data link as -700 MW to +700 MW. How is this accomplished? Can someone please describe the SAMA logic which would represent this signal conversion?





RE: Analog scale conversions
Dan
RE: Analog scale conversions
RE: Analog scale conversions
RE: Analog scale conversions
(current-4ma)*700W/16ma
That should be the conversion factor and you actually would not have any negative values as results, since all your inputs are, by definition, positive.
TTFN
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RE: Analog scale conversions
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Sometimes I only open my mouth to swap feet...
RE: Analog scale conversions
You want to make 0% to be 50% and 100% to be 100% so...
Multiply by .5 and add 50%, now your range is -100% to 100% (-700 - +700MW) 4mA = 0MW (50%), 20mA= 700MW (100%)
Is this what you mean, or do you want the actual Sama symbols for adder and multipier too?