PurposeThe Analog Input (AI) block sends and receives analog data from an I/O driver or OPC server every time the Scan, Alarm, and Control (SAC) program scans the block. FeaturesThe Analog Input block:
The equation for a line is Y = mX + b Where Y is the scaled output value, X is the raw value from the PLC, m is the slope of the line and b is the y intercept. The slope for our linearization is defined by output range divided by the input. m = (ScaleHigh - ScaleLow ) / (RawHigh - RawLow) The y intercept is determined by using the low values and the slope. b = ScaleLow - m(RawLow) In the analog block this results in the block's current value is equal to the driver value times the slope plus the y intercept. X_CV = (IO value)m + b The driver value equates to the block current value minus the y intercept divided by the slope. IO Value = (X_CV – b) / m
Typical UsesExampleFields |
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