Chapter 9—C445 Logic Engine and Expansion I/O176 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.comPIC—Proportional Integral ControllerThe PI function block is a proportional- and integral-based closed loop controller that triesto bring the error between the set-point command value and the measured feedback valuefrom the plant using the provided gains.This can be used to control parameters of a plant. Some examples would be temperature,pressure, flow, etc.A typical use of the block would be to have:1. A user-defined set-point that can be provided through any source such as an analoginput or a process data in.2. The output of the PIC connected to the plant, usually some driver.3. The output of the plant fed back to the PI block through any analog source.When the block starts executing, the PIC function block will try to reduce the errorbetween the MEASVAL and the SETPOINT by altering the OUT.
