To do that, I need two Scale with Parameter (SCP) instructions. Let’s consider the process where I have to control the flow of fluid.įor that, I have a flow transmitter that provides me the present flow rate (feedback), a controller (PID block) which compares with the setpoint and present flow rate, then PID controls the manipulated variable (control valve) to maintain the required flow rate as per setpoint. Create a new project and open programming environment.ĭownload RsLogix 500 if you don’t have it. To understand the PID block (software) in RSlogix software follows the below steps. The second one is as a software block in PLC or DCS programming. One is a Single-stand-alone microcontroller-based hardware controller unit. PID Controllers are generally available in two types. The setpoint may be entered as a static variable or as a dynamic variable that is calculated from a mathematical operation. The PID algorithm controls the output to the control point so that a setpoint is achieved.
The PID algorithm is used to control an analog process having a single control point and a single feedback signal.
The greater the error between the setpoint and process variable input, the greater the output signal, and vice versa. The PID equation controls the process by sending an output signal to the control valve. PID closed-loop control holds a process variable at the desired set point.
This is an output instruction that controls physical properties such as temperature, pressure, liquid level, or flow rate using process loops. In this article, I will cover the PID block in RSlogix 500 with an example of process control.
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