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# Process Rates

You use the Process rates data grid to define the daily process rate for the process. You can use multiple rows in the data grid to define process rates that change throughout the schedule.

Process rates can only change at the start and end of a scheduling period. If you specify a process rate change during a scheduling period, the change takes effect at the end of that scheduling period.

By default, processes are assumed to operate 24 hours a day 7 days a week. If you want to account for shutdown time for the process in your schedule, create a calendar for the working or holiday time and apply the calendar to the process.

You can define the parameters for process rates in the Process rates data grid, or you can use the spreadsheet view. To access the spreadsheet view, select Spreadsheet > Enable Spreadsheet Views, and then select the Process Rates spreadsheet. When the Process Rates spreadsheet is enabled, it replaces the Process rates data grid in the Location Properties pane.

### Columns in the Process Rates Data Grid

Column | Description
--- | ---
Active | Selected: The process rate is active. Cleared: The process rate is inactive. Tip: When you clear the Active check box, you make the process rate ineffective without deleting the rule.
Rate | The daily rate at which the process pulls material.
Units | The units in which the daily date is measured. Options are: VOLUME MASS any user-defined aggregate qualities
Material Classes | The material classes that count toward the process rate. Tip: You can use wildcards to specify more than one material class To specify the material classes using the Wildcard Expression Builder, click the Ellipsis button.
Date/event | The date on which the process rate is applied. You can use a calendar date or an event. The date or event plus the Delay determines the actual start date. You us the Calendar button to select a date from a calendar. You use the Ellipsis button to select an event using the Event Builder. Note: Process rates can change only at the start or the end of a scheduling period. If you specify a process rate change during a scheduling period, the change takes effect at the end of that scheduling period.
Delay | The delay after the Date/event before the process rate is applied. The default delay is 0. The delay can be any positive number.
Comments | The comments that you want to record for the process rate.

### See also

- Surface Locations Properties Pane for Processes
- Surface Locations Pane

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