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Function Blocks Instruction Manual
User Manual
APID – Advanced Pid
Overview
The advanced PID function block provides the following additional features comparing to the
standard PID algorithm and the enhanced PID:
selection of the terms (proportional, integral, derivative) calculated on error or process variable
PI Sampling algorithm
Adaptive gain
Configurable Limits of anti reset wind-up
Special treatment for the error
Discrete output to indicate the actual mode
The standard features as well the enhanced ones are described in the PID block, therefore they will
not be repeated here.
Schematic
Description
Selection of the terms (proportional, integral, derivative) calculated on error or process variable
The control algorithm can be ideal parallel or not iterative (ISA). For each algorithm can choose the
terms (proportional, integral, and derivative) calculated on error or process variable by setting the
PID_TYPE parameter. Where:
PI.D - The P and I terms are calculated based on the error and the D term on the PV.
PID - The P, I and D terms are calculated based on the error.
I.PD - The I is calculated based on the error and the P and D terms on the PV.
PI Sampling algorithm
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