Chapter 9—C445 Logic Engine and Expansion I/O
176
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
www.eaton.com
PIC—Proportional Integral Controller
The PI function block is a proportional- and integral-based closed loop controller that tries
to bring the error between the set-point command value and the measured feedback value
from 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 analog
input 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 error
between the MEASVAL and the SETPOINT by altering the OUT.
