Allen-Bradley Micro800 General Instructions Manual page 583

Program example information
The water supply level program example includes the following information.
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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
Setpoint (SP)
Process value (PV)
Manipulated value (MV)
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.
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
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
Description
Measurement of height that defines the target water supply level.
The 4-20mA must be converted to the same unit as the SP, which is a measurement of height.
Must be converted to an analog value so it can be output to the drive to control the pump.
Proportional Integral Derivative (PID) instruction
Chapter 20
583