![]() When the SP is changed or a disturbance in the process causes the PV to change, an error occurs between the SP and PV. The CO may be a control valve position, a damper actuator position, a variable speed drive speed setting, etc. The PV may be a flow rate, pressure, temperature or process variable that can be measured by process instrumentation. ![]() The PV is usually an Analog Input to the PLC and is a measured value in the Process being controlled. The SP is usually an operator-entered value and is the desired value of the PV. For more information on how PID is implemented in the CLICK PLC, see Help topic PID Control in CLICK.Ī PID control loop is a continuous feedback loop that uses the error between a Setpoint (SP) and a Process Variable (PV) to determine the value of a Control Output (CO). The CLICK Ethernet PLC is capable of supporting up to 8 PID Control Loops. PID Configuration Mode PID Configuration Mode
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