Changing The Pid_3Step V2 Interface - Siemens SIMATIC S7-1200 Function Manual

Control logic
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.
See also
Configuring PID_3Step V1 (Page 138)
9.2.4.3

Changing the PID_3Step V2 interface

The following table shows what has changed in the PID_3Step instruction interface.
PID_3Step V1
Input_PER
Feedback_PER
Manual_UP
Manual_DN
Output_PER
Config.Loadbackup
Config.TransitTime
GetTransitTime.Start
SUT.CalculateSUTPara
ms
SUT.TuneRuleSUT
TIR.CalculateTIRParams TIR.CalculateParams
TIR.TuneRuleTIR
Retain.Mode
PID control
Function Manual, 03/2017, A5E35300227-AC
PID_3Step V2
Input_PER
Feedback_PER
Disturbance
Manual_UP
Manual_DN
ErrorAck
ModeActivate
Output_PER
ManualUPInternal
ManualDNInternal
CancelTuningLevel
VirtualActuatorLImit
Loadbackup
Retain.TransitTime
SUT.CalculateParams
SUT.TuneRule
TIR.TuneRule
Mode
Change
Data type from Word to Int
Data type from Word to Int
New
Function
Function
New
New
Data type from Word to Int
New
New
New
New
Renamed
Renamed and retentivity added
Replaced by Mode and ModeActivate
Renamed
Renamed
Renamed
Renamed
Function
Declaration of static for in-out parameters
Instructions
9.2 PID_3Step
315