Function Block Properties Dialog Box - Limits Tab Overview (CC)

The Coordinated Control (CC) instruction controls a single process variable (PV) by manipulating as many as three different control variables (CV). As an option, any of the three outputs can be used as an input to create feed forward action in the controller. The CC calculates the control variables (CV1, CV2, and CV3) in the auto mode based on the PV deviation from the set point (SP), internal models, and tuning.

Use the Limits
tab of the Function Block Properties
dialog box to set the values of the parameters for the selected CC function block.

The following table describes the parameters available on the Limits
tab:

Parameter	Description
Set Point
High Limit	Enter a value for the SP high limit, scaled in PV units. The valid range is SPLLimit to PVEUMax . The default value is 100.0.
Low Limit	Enter a value for the SP low limit, scaled in PV units. The valid range is PVEUMin to SPHLimit . The default value is 0.0.
Control Variables
High Limit CV1	Enter the control variable CV1 high limit value. This is used to set the CV1HAlarm output. It is also used for limiting CV1 when in Auto mode or Manual mode if CVManLimiting is TRUE. Valid values are in the range of CV1LLimit < CV1HLimit 100.0. The default value is 100.0.
High Limit CV2	Enter the control variable CV2 high limit value. This is used to set the CV2HAlarm output. It is also used for limiting CV2 when in Auto mode or Manual mode if CVManLimiting is TRUE. Valid values are in the range of CV2LLimit < CV2HLimit 100.0. The default value is 100.0.
High Limit CV3	Enter the control variable CV3 high limit value. This is used to set the CV3HAlarm output. It is also used for limiting CV3 when in Auto mode or Manual mode if CVManLimiting is TRUE. Valid values are in the range of CV3LLimit < CV3HLimit 100.0. The default value is 100.0.
Low Limit CV1	Enter the control value CV1 low limit value. This is used to set the CV1LAlarm output. It is also used for limiting CV1 when in Auto mode or Manual mode if CVManLimiting is TRUE. Valid values are in the range of 0.0 CV1LLimit < CV1HLimit . The default value is 0.0.
Low Limit CV2	Enter the control value CV2 low limit value. This is used to set the CV2LAlarm output. It is also used for limiting CV2 when in Auto mode or Manual mode if CVManLimiting is TRUE. Valid values are in the range of 0.0 CV2LLimit < CV2HLimit . The default value is 0.0.
Low Limit CV3	Enter the control value CV3 low limit value. This is used to set the CV3LAlarm output. It is also used for limiting CV3 when in Auto mode or Manual mode if CVManLimiting is TRUE. Valid values are in the range of 0.0 CV3LLimit < CV3HLimit . The default value is 0.0.
Positive Rate of Change CV1	Enter the CV1 rate of change (ROC) limit, in percent per second. Rate of change limiting is only used when in Auto mode or Manual modes if CVManLimiting is TRUE. A value of zero disables CV1 ROC limiting. Valid values are in the range of 0.0 to the maximum positive floating point value. The default value is 0.0.
Positive Rate of Change CV2	Enter the CV2 ROC limit, in percent per second. Rate of change limiting is only used when in Auto mode or Manual modes if CVManLimiting is TRUE. A value of zero disables CV2 ROC limiting. Valid values are in the range of 0.0 to the maximum positive floating point value. The default value is 0.0.
Positive Rate of Change CV3	Enter the CV3 ROC limit, in percent per second. Rate of change limiting is only used when in Auto mode or Manual modes if CVManLimiting is TRUE. A value of zero disables CV3 ROC limiting. Valid values are in the range of 0.0 to the maximum positive floating point value. The default value is 0.0.
Negative Rate of Change CV1	Enter the CV1 ROC limit, in percent per second. Rate of change limiting is only used when in Auto mode or Manual modes if CVManLimiting is TRUE. A value of zero disables CV1 ROC limiting. Valid values are in the range of 0.0 to the maximum positive floating point value. The default value is 0.0.
Negative Rate of Change CV2	Enter the CV2 ROC limit, in percent per second. Rate of change limiting is only used when in Auto mode or Manual modes if CVManLimiting is TRUE. A value of zero disables CV2 ROC limiting. Valid values are in the range of 0.0 to the maximum positive floating point value. The default value is 0.0.
Negative Rate of Change CV3	Enter the CV3 ROC limit, in percent per second. Rate of change limiting is only used when in Auto mode or Manual modes if CVManLimiting is TRUE. A value of zero disables CV3 ROC limiting. Valid values are in the range of 0.0 to the maximum positive floating point value. The default value is 0.0.
Limit Control Variable in Manual Mode	Select this check box to limit CV1, CV2, or CV3 values. If Manual mode and CVManLimiting are TRUE, CV1, CV2, and CV3 are limited by the appropriate CV1, CV2, and CV3 HLimit and LLimit values.
Status	Displays 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	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 appears. 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 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.

Function Block Elements

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