In industrial automation projects, all analog devices, including those connected via Analog Input Cards, necessitate scaling to convert raw input values into PLC-compatible values for effective processing, interlocking, alarming, and control. The conversion uses a formula, z = (((Px – Py)/(Ix – Iy)) * (i – Iy)) + Py, to transform measurements like current or pressure into scaled outputs relevant to system requirements. Various programmatic approaches, such as Ladder Logic or Structured Text, are utilized to implement this scaling, with considerations for capping values at predefined limits to prevent errors.
