A red border around the faceplate indicates this required output is in Local control or has failed; a yellow border indicates a fail condition exists but the configured fail action is for no action (not required) or simulate.
The following items are found on the MPCPro Manipulated variable function block faceplate:
BKCAL_IN Variable - This field displays the BKCAL_INn value of the MPC block in cyan. The background color of the 3-D box changes from gray to orange or red when the BKCAL_INn status becomes uncertain or bad, respectively. The BKCAL_INn value is visible in the decimal format provided by SCALE_ATTR_INn_DECPT.
Units - This area provides the engineering units description used for the Manipulated Variable as defined in the SCALE_ATTR_INn parameter.
EU 100 - This value corresponds to 100% of scale for PROC_INn.
Target Mode – This field contains a word in white text that describes the target mode for the loop. The background changes to blue when the target mode and normal mode are different.
Actual Mode – This field contains a word in yellow text that describes the ACTUAL mode of the loop. The background changes to blue when the actual mode and normal mode are different.
EU 0 - This value corresponds to 0% of scale for the Manipulated Variable.
Tick marks - Use this vertical arrangement of black lines to indicate percentages of PROC_INn scale.
BKCAL_IN bar graph - This field indicates the value of the BKCAL_INn parameter for the MPCPro block, which is the same as the value displayed in the BKCAL_IN Variable display box.
Manipulated Variable slider - To move this button, hold down the left mouse button while the cursor is over the arrowhead and then move the mouse up or down to correspond to the new value desired. The new value is then written to the value of PROC_INn in engineering units. The arrowhead is controllable only when the target mode is MAN.
Manipulated Variable Entry - A 3-D recessed box displaying the PROC_INn value of the nth Manipulated Variable in the MPCPro block. The background color of this box changes to orange or red when the PROC_INn status becomes uncertain or bad, respectively. Double-clicking this box while the target mode is MAN produces a dialog that prompts you for an manipulated value. The valid range for input is defined by the engineering unit EU 0 and EU 100 values of SCALE_ATTR_INn. Valid input ranges from -10 percent to 100 percent of PROC_INn scale. The PROC_INn value is visible in the decimal format provided by SCALE_ATTR_INn.DECPT.
MV High and Low Limits - These arrowheads are vertically positioned relative to the MV bar graph to indicate the High and Low Limits. Although these arrows cannot be dragged with the mouse, the values they indicate can be modified by using the Detail Display.
Connected block MPC mode – Puts the connected block in MPC mode.
Connected block Local mode – Puts the connected block in Local mode.
Connected block mode – This field displays the actual mode of the connected block.
PSV/EV – The value of the manipulated variable if the optimization type is set to Equalize Value (EV) or Preferred Settling Value (PSV). Otherwise, if the optimization type is set to Maximize, Minimize, or Target, this value does not appear on the faceplate.
Detail Display button – Opens the Detail Display for the module.
MPC Operate Pro button – Opens the MPC Operate Pro application for the block.
MPCDiagnostics button – Opens the MPCDiagnostics application for the block.
- Limit Information - This field displays a word in yellow text representing theMV_ACT[n] value of the MPCPro block. The background color of the 3-D box changes from gray to blue when the MV_ACT[n] value is non-zero. The text displayed represents the following values:
Value
Text
0.0
Not Limited
1.0
Low Limited
2.0
High Limited
3.0
Constant