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Analog Programming Scaling Analog inputs for PLC •
In automated systems, not all system components format data in the same manner, and as a result, data must be scaled, or resized, before it is used by a PLC control algorithm or outputted to a field device. The Scale (SCL) Instruction and the Scale with Parameters (SCP) Instruction accomplish that task
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Both instructions use the same formula to perform the scaling function, which is y = mx+b, where y is the output, m is the scaling rate, x is the input, b is the offset.
Scaling rate (m) = (scaled Max - scaled Min) / (input Max - input Min) Offset (b) = (scaled Min) - (input Min x m)
