wtw DIQ/S 282, Operating Manual, Page: 151 / 186

DIQ/S 28X Outputs
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Characteristic
curve of the
proportional
controller
For a pure P controller the correlation between the measured value and current
I on the controller output results in the following characteristic curve:
The proportional range Xp is limited by the measurement range of the linked
sensor. If a value is entered for the parameter Xp that is greater than zero, the
controller has a positive characteristic curve (example Fig. 7-17). To obtain a
positive characteristic curve, a negative value must be entered for
Xp .
PD controller
1 to 9999 0
PID controller
1 to 9999 1 to 9999
Regulator type td [s] ti [s]
Fig. 7-17 Proportional controller (negative characteristic curve)