Characteristic Values Of The Control Section - Siemens SIMATIC S7-1200 Function Manual

Principles for control

2.3 Characteristic values of the control section

2.3 Characteristic values of the control section
Determining the time response from the step response
Time response of the controlled system can be determined based on the time characteristic
of process value x following a step change of output value y. Most controlled systems are
self-regulating controlled systems.
The time response can be determined by approximation using the variables Delay time T
Recovery time T
tangents to the maximum value and the inflection point of the step response. In many
situations, it is not possible to record the response characteristic up to the maximum value
because the process value cannot exceed specific values. In this case, the rate of rise v
used to identify the controlled system (v
20
and Maximum value X
g
. The variables are determined by applying
max
= Δ /Δ ).
max x t
Function Manual, 03/2017, A5E35300227-AC
,
u
is
max
PID control