Function Block Properties dialog box - Autotune tab (PIDE)

The Enhanced Proportional Integral Derivative (PIDE) instruction provides enhanced capabilities over the standard PID instruction for control of process variables (PV) such as flow, pressure, temperature, or level. The PIDE instruction uses the velocity form of the PID algorithm.
Use the
Autotune
 tab to configure autotuning for the selected PIDE function block.
The following table describes the parameters available on the
Autotune
 tab:
Parameter
Description
Tag Name
Displays the name of the autotune tag associated with this PIDE block.
Acquire Tag
Click this button to acquire the autotune tag for this PIDE block. If the tag is already acquired by this block (i.e., PIDE.AtuneReady and Autotune.AtuneAcquired are TRUE), then this button is disabled. The button is also disabled if the Autotune tag has been acquired by another PIDE block. Clicking on this button sets PIDE.AtuneAcquire to TRUE.
Tag Status
Displays the state of the tag. The possible states are:
  • Available
     - when Autotune.AtuneAcquired is FALSE
  • Acquired
     - when Autotune.AtuneAcquired is TRUE and PIDE.AtuneReady is TRUE
  • Acquired by another PIDE
     - when Autotune.AtuneAcquired is TRUE and PIDE.AtuneReady is FALSE
Release Tag
Click this button to release a tag that has been acquired by any PIDE block. This button is enabled if any PIDE block has acquired the current tag. Clicking on this button releases the tag from this and any other PIDE block that has acquired it, and sets PIDE.AtuneUnacquire to TRUE. If another PIDE block was performing an autotune using this tag, it will be aborted.
Process Type
Choose the value of the ProcessType Autotune parameter. Choose from:
  • Temperature
  • Pressure
  • Flow
  • Level
  • Position
  • Velocity
  • Integrating
  • Non-integrating
  • Unknown
PV Change Limit
Enter a value for the PVTuneLimit autotune parameter.
If the PV exceeds this limit during the autotune process, the autotune is aborted.
CV Step Size
Enter the value of the StepSize autotune parameter. This defines the size of the step change to the output that the autotune will apply to the control variable (CV) when the autotune process begins.
Proportional
Displays the value of the PGain PIDE parameter.
Integral
Displays the value of the IGain PIDE parameter.
Derivative
Displays the value of the DGain PIDE parameter.
Autotune
Click this button to access the Autotune dialog box.
Execution State
Displays the autotune state. Possible states are:
  • Ready
  • In Progress
  • Complete
  • Aborted
OK
Click this button to add the selected item in the instruction list to the routine and close the
Function Block Properties
 dialog box.
Cancel
Click this button to cancel any edits you have made and close the
Function Block Properties
 dialog box.
Apply
Click this button to accept your changes and continue editing in the
Function Block Properties
 dialog box.
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