Function Block Properties dialog box - EU Scaling tab (MMC)

The Modular Multivariable Control (MMC) instruction controls two process variables (PV) to their setpoints (SP) using up to three control variables. The MMC instruction calculates the control variables (CV1, CV2, and CV3) in the auto mode based on the PV1 -SP1, PV2 - SP2 deviation, internal model, and tuning.

Use the EU Scaling
tab to set the Engineering Unit (EU) scaling values for the selected MMC function block.

The following table describes the parameters available on the EU Scaling
tab:

Parameter	Description
Process Variables
Max at 100% Span - PV1	Enter the maximum scaled value for PV1, which is the value of PV1 and SP1 that corresponds to 100 percent span of the Process Variable. Valid values are in the range of PVEUMin < PVEUMAX maximum positive float. The default value is 100.0
Max at 100% Span - PV2	Enter the maximum scaled value for PV2, which is the value of PV2 and SP2 that corresponds to 100 percent span of the Process Variable. Valid values are in the range of PVEUMin < PVEUMAX maximum positive float. The default value is 100.0
Min at 0% Span - PV1	Enter the minimum scaled value for PV1, which is the value of PV1 and SP1 that corresponds to 0 percent span of the Process Variable. Valid values are in the range of maximum negative float PVEUMin < PVEUMax. The default value is 0.0
Min at 0% Span - PV2	Enter the minimum scaled value for PV2, which is the value of PV2 and SP2 that corresponds to 0 percent span of the Process Variable. Valid values are in the range of maximum negative float PVEUMin < PVEUMax. The default value is 0.0
Control Variables
Max at 100% Output	Enter the maximum value for CV1EU, CV2EU, and CV3EU. This is the value of CVEU1, CVEU2, and CVEU3 that corresponds to 100 percent CV1, CV2, and CV3 respectively. The default value is 100.0
Min at 0% Output	Enter the minimum value for CV1EU, CV2EU, and CV3EU. This is the value of CVEU1, CVEU2, and CVEU3 that corresponds to 0 percent CV1, CV2, and CV3 respectively. The default value is 0.0
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.

Function Block Elements

Provide Feedback

Have questions or feedback about this documentation? Please submit your feedback here.