Siemens SPS starter kit 6ED1057-3BA00-0AA8 12 Vdc, 24 Vdc 6ED1057-3BA00-0AA8 データシート
製品コード
6ED1057-3BA00-0AA8
Reference material
5.3 Special functions
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Operating Instructions, 06/2014
5.3.5.2
Controller basics
A controller can be simply portrayed as follows:
The comparing element and the controller function describe the conduct of the controller.
The following describes the most important types of controller. A controllerstep response
The following describes the most important types of controller. A controllerstep response
tells us a lot about its conduct. The step response describes how a controller reacts to the
erratic change in the process value.
The three basic types of controllers are as follows:
● Proportional-action controller (P controller)
● Integral-action controller (I controller)
● Differential-action controller (D controller – not described here)
Controllers can combine the three types. For example, a PI controller is a
The three basic types of controllers are as follows:
● Proportional-action controller (P controller)
● Integral-action controller (I controller)
● Differential-action controller (D controller – not described here)
Controllers can combine the three types. For example, a PI controller is a
proportional/integral controller.
P Controller
A proportional-action controller (P controller) changes the manipulated variable M
proportional to the loop error. The P controller works immediately. By it cannot drive the loop
error to zero.
M
M
Pn
= k
P
× e
n
M
Pn
: Manipulated variable of the P controller at the time n
k
P
: Gain of the P controller
e
n
: Loop error at the time n
The following picture shows a jump in process value and step response of the controller:
Summary
The P controller has the following characteristics:
The P controller has the following characteristics: