PID was originally developed as an analog controller, which operates on the error generated. Nowadays discrete version of the controller is available. On the other hand PLC is just an extension...The PID Controller. In this 3 part series, we will explore how to implement both analog and digital control systems using a PID (Proportional Integral Derivative) controller. With a PID controller, we can control thermal, electrical, chemical, and mechanical processes. All articles in this series: The design and tuning of PID controllers is explained using the step response, and various methods of assessing quality of response are presented. The root locus plot then is introduced as a method of designing complex systems to meet transient response specifications. Section four focuses on discrete time systems. The same discretisation is applied to the continuous time PID controller. Not only is the discrete time control law shown, U(t_k), known as the "positional algorithm" but they are further expanded to give...The digital controllers are in the form of digital circuits, digital computers, or microprocessors. The discrete-time PID controller that means discussing the continuous signal which it has been converted from continuous-time to discrete-time, therefore always used analog to digital converter. Discrete-time domain IMC-based PID control design for industrial processes with time delay. 2016,,, 5946-5951. https://doi.org/10.1109/ChiCC.2016.7554290; Lifu Zhang, Xiaobin Xu, Shibao Li, Xue Ma, Chenglin Wen. A belief rule inference approach for controlling the system with uncertain parameters. 2016,,, 9081-9086. The Discrete PID Controller block implements a PID controller (PID, PI, PD, P only, or I only). The block is identical to the PID Controller block with the Time domain parameter set to Discrete-time. The block output is a weighted sum of the input signal, the integral of the input signal, and the derivative of the input signal. Description. The Discrete PI Controller block implements discrete PI control with external anti-windup input.. This diagram is the equivalent circuit for the controller with external anti-windup input. The PID controller is an essential part of every control loop in the process in-dustry [1]. Studies have shown that the PID provides an optimal solution of the regulator problem (rejection of disturbances) and with simple enhancements, pro-vides an optimum servo response (setpoint response) [3]. Tests show that the PID CLOSED LOOP CHARACTERISTICS OF DC MOTOR PROPORTIONAL-DERIVATIVE-INTEGRAL CONTROL (DISCRETE-TIME) The analysis for designing a digital implementation of a PID controller in a Microcontroller (MCU) or FPGA device requires the standard form of the PID controller to be discretised. Approximations for first-order derivatives are made by backward finite differences.