Chapter 20 Proportional Integral Derivative (PID) instruction
584 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Sequence of events in water supply level system
The following table identifies the components in the water supply system and
describes, in sequence, the events that occur in the system when the water supply
level program runs.
No Item Description
Controller output Sends the MV to the PowerFlex drive (0-10V).
PowerFlex drive Controls the water pump (0-50Hz).
Water pump Controls the water level in the supply tank.
Output transfer device Measures the height of the water supply level (4-20mA) and sends the PV to the controller.
Controller input Receives the PV (water supply level of 4-20mA).
PLC program Converts the PV to the same unit as the SP (measurement of height) and determines the difference between the PV and SP and adjusts the
MV according to the parameter values defined in the P, I and D parameters.
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