Proportional Integral Derivative (PID) instruction Chapter 20
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 583
Program example information
The water supply level program example includes the following information.
• The sequence of events that occur in the control process
• How the setpoint, process and manipulated values are used in the control
program
• An example function block diagram that shows the IPIDController and
other instruction blocks
Setpoint, process and manipulated values
The following table defines how the SP, PV, and MV values are used in the water
supply level program.
Item Description
Setpoint (SP) Measurement of height that defines the target water supply level.
Process value (PV) The 4-20mA must be converted to the same unit as the SP, which is a measurement of height.
Manipulated value (MV) Must be converted to an analog value so it can be output to the drive to control the pump.
Water supply level system
The following diagram shows the components in the water supply level system
that are controlled by the water supply level program. The table following the
diagram describes the events that occur when the control program runs.
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