PLC PID Tutorial – How PID Control Works (RSLogix 500 Example)
This video is the third part of the Closed Loop System series and introduces PID control using a PLC. You’ll see how the PID instruction works in RSLogix 500, how the process variable and control variable are scaled, and how a pressure control loop is implemented in ladder logic.
The example covers a complete closed‑loop system using a pressure transmitter (process variable) and a flow valve (control variable). You’ll learn how the PID instruction calculates error, how SCP scaling is applied to analog inputs and outputs, and how the PLC maintains a 50 psi setpoint.
If you already understand what PID is and want to learn PID controller tuning, see:
Pid Tuning Calculator Tips
#PLCTraining #PIDControl #RSLogix500
00:00 Introduction to PID Control Systems
00:20 How the PID Instruction Operates
00:55 Pressure Control Loop Overview
01:14 Scaling the Pressure Transmitter Signal
02:04 Using the SCP Instruction for Input Scaling
03:40 Configuring PID Instruction Parameters
04:02 Scaling the Control Variable Output
05:10 Analog Output and Flow Valve Operation
05:36 Achieving and Maintaining the Setpoint
The example covers a complete closed‑loop system using a pressure transmitter (process variable) and a flow valve (control variable). You’ll learn how the PID instruction calculates error, how SCP scaling is applied to analog inputs and outputs, and how the PLC maintains a 50 psi setpoint.
If you already understand what PID is and want to learn PID controller tuning, see:
Pid Tuning Calculator Tips
#PLCTraining #PIDControl #RSLogix500
00:00 Introduction to PID Control Systems
00:20 How the PID Instruction Operates
00:55 Pressure Control Loop Overview
01:14 Scaling the Pressure Transmitter Signal
02:04 Using the SCP Instruction for Input Scaling
03:40 Configuring PID Instruction Parameters
04:02 Scaling the Control Variable Output
05:10 Analog Output and Flow Valve Operation
05:36 Achieving and Maintaining the Setpoint