As shown in figure "B" of the illustrated function block for a PLC PID controller, to what input is the actual analog signal of the measured value delivered? EL-0251

Question

As shown in figure "B" of the illustrated function block for a PLC PID controller, to what input is the actual analog signal of the measured value delivered?  EL-0251

Accepted Answer

Option A: PV. In PLC PID control loops, the Process Variable (PV) represents the actual feedback signal from the field sensor. This analog input is compared against the Set Point (SP) to calculate the error, allowing the controller to adjust the output (XO) and maintain the desired process parameter as required by IEEE 45 standards.