Function Block Properties dialog box - EUs/Limits tab (PIDE)

The Enhanced Proportional Integral Derivative (PIDE) instruction provides enhanced capabilities over the standard PID instruction for control of process variables such as flow, pressure, temperature, or level. The PIDE instruction uses the velocity form of the PID algorithm.
Use the
EUs/Limits
 tab to set the limits applied to Engineering Units (EU), process variables (PV), control variables (CV), and set points (SP) used by the selected PIDE function block.
The following table describes the parameters available on the
EU/Limits
tab:
Parameter
Description
Engineer Units Scaling - PV
  • Max at 100% Span
Sets the value of the PVEUMax parameter.
  • Min at 0% Span
Sets the value of the PVEUMin parameter.
Engineer Units Scaling - CV
  • Max at 100% Output
Sets the value of the CVEUMax parameter.
  • Min at 0% Output
Sets the value of the CVEUMin parameter
SP Limits
  • High
Sets the value of the SPHLimit parameter.
  • Low
Sets the value of the SPLLimit parameter.
CV Limits
  • High
Sets the value of the CVHLimit parameter.
  • Limit
Sets the value of the CVLLimit parameter.
  • Rate of change
Sets the value of the CVROCLimit parameter.
  • Limit CV in manual mode
Sets the value of the CVManLimiting parameter.
If the check box is selected, this value is set to 1; otherwise, it is set to 0.
Status
Displays read-only status information for blocks containing status bits. If none of the status bits are set, an OK message appears in this field. Otherwise, a list of the status bits that are set appears here. This list is comprised of the parameter names associated with the status bits, and typically explain which parameters were configured with invalid values.
Execution Order Number
Displays the block's execution number if the routine is in a verified state. If the routine is not yet verified, a
Routine not verified
 message displays. Note that this item is read-only.
Never display description in a routine
Select this check box if you do not want the description to display in the routine.
OK
Click this button to add the selected item in the instruction list to the routine and close the Fun
ction 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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