Instructions
9.2 PID_3Step
PID control
Function Manual, 03/2017, A5E35300227-AC
315
An increase of the output value is generally intended to cause an increase in the process
value. This is referred to as a normal control logic. For cooling and discharge control
systems, it may be necessary to invert the control logic. PID_3Step does not work with
negative proportional gain. If InvertControl = TRUE, an increasing control deviation causes a
reduction in the output value. The control logic is also taken into account during pretuning
and fine tuning.
Configuring PID_3Step V1 (Page 138)
Changing the PID_3Step V2 interface
The following table shows what has changed in the PID_3Step instruction interface.
Data type from Word to Int
Data type from Word to Int
Manual_UP Manual_UP Function
Data type from Word to Int
Renamed and retentivity added
Replaced by Mode and ModeActivate
SUT.CalculateSUTPara
SUT.CalculateParams Renamed
Retain.Mode Mode Function
Declaration of static for in-out parameters
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