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Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Appendix E PID Function Blocks
IPIDCONTROLLER Function
Block
This function block diagram shows the arguments in the IPIDCONTROLLER function block.
The following table explains the arguments used in this function block.
Table 86 - IPIDCONTROLLER Arguments
Parameter
Parameter
Type
Data Type
Description
EN
Input
BOOL
Function block enable
TRUE = Execute function.
FALSE = Do not execute function.
Applicable to Ladder Diagram programs.
Process
Input
REAL
Process value, which is the value measured from the process
output.
SetPoint
Input
REAL
The set point value for the process.
Feedback
Input
REAL
Feedback signal, which is the value of the control variable
applied to the process.
For example, the feedback can be IPIDCONTROLLER output.
Auto
Input
BOOL
Operating modes of PID controller:
TRUE = Normal operation of PID.
FALSE = Output tracks Feedback.
Initialize
Input
BOOL
A change in value (TRUE to FALSE or FALSE to TRUE) causes
the controller to eliminate any proportional gain during that
cycle. It also initializes AutoTune sequences.
Gains
Input
GAIN_PID
Gains PID for IPIDCONTROLLER.
Use the GAIN_PID data type to define the parameters for the
Gains input.
AutoTune
Input
BOOL
TRUE = Autotune.
FALSE = No Autotune.
ATParameters
Input
AT_Param
AutoTune parameters
Use AT_Param data type to define the parameters for the
ATParameters input.
Output
Output
Real
Output value from the controller.
AbsoluteError
Output
Real
Absolute error (Process - SetPoint) from the controller.
ATWarnings
Output
DINT
Warning for the AutoTune sequence. Possible values are:
0 = No auto tune done.
1 = In auto tune mode.
2 = Auto tune done.
-1 = Error 1: Input automatically set to TRUE, no auto tune
possible.
-2 = Error 2: Auto tune error, the ATDynamSet expired.
OutGains
Output
GAIN_PID
Gains calculated from AutoTune Sequences.
Use GAIN_PID data type to define the OutGains output.
ENO
Output
BOOL
Enable output.
Applicable to Ladder Diagram programs.
IPIDCONTROLLER
IPIDCONTROLLER
Process
ENO
Output
AbsoluteError
SetPoint
FeedBack
Auto
Initialize
Gains
AutoTune
ATParameters
ATWarning
OutGains
EN