Modeling Options

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Modeling Options

Multi Period Settings

Allow Cross Period Flows: If you select this option, transportation links will be allowed to extend beyond one time period. End to end service constraints are not guaranteed to work properly if you select this option. To set this option in a scenario, select the “Allow Cross Period Flows” Network Optimization Options field and select "Yes" as the value.

Allow Cross Period Production: If you select this option, production times will be allowed to extend beyond one time period. End to end service constraints are not guaranteed to work properly if you select this option. To set this option in a scenario, select the “Allow Cross Period Production” Network Optimization Options field and select "Yes" as the value.

By default, shipments and productions that extend across multiple periods are not allowed. However, if you want Network Optimization to start production or shipment in a period earlier than when it was requested (based on the period length), you can select these options to result in this behavior.

If your multi-period model uses periods of different lengths, such as months, use of Allow Cross Period Flows and Allow Cross Period Production is not recommended. This is particularly true when the transportation time between two sites is in between the period lengths of two consecutive periods. For example, if Period_001 has a length of 31 days, Period_002 has a length of 29 days and you have a Transport Time of 30 days, selecting the options to “allow across periods” causes results to be incorrect. When these options are enabled in such models, you can experience problems such as incorrect or incomplete infeasibility diagnosis.

Detailed Production Settings

Ignore Work Center Hard Time Constraints: Select this option if you do not want to restrict the number of hours on the work centers. This removes the implied hard constraint. For example, in a weekly multi-time period model, there is an implied hard time constraint of 168 hours (7 days x 24 hours). To set this option in a scenario, select the “Ignore Work Center Hard Time Constraints” Network Optimization Options field and select "Yes" as the value.

Enforce Integer Number Of Lots: Select this option if you want only integer lots to be produced by processes; that is, fractional lots will not be produced. To set this option in a scenario, select the “Enforce Integer Number Of Lots” Network Optimization Options field and select "Yes" as the value.

Calculation of Total Changeover Time

You can select one of the following methods to calculate total production changeover time.

Apply Single Changeover Time If There Is A Non-Zero Process Flow: If you select this option, changeover time will be applied once if any process flow occurs. When this option is selected, you have the option to select the "Lot Size As Min Production" option. When setting this value in a scenario, select “Apply Single Changeover Time If There Is A Non-Zero Process Flow” as the Network Optimization Options field and select "Yes".
Lot Size As Min Production: When you select this option, the production must be at least one lot size. When setting this value in a scenario, select “Lot Size As Min Production” as the Network Optimization Options field and select "Yes".

By-Product Disposal Cost: If you create by-products as part of your bills of material, you can set the disposal cost per unit of by-product in this option. A by-product is considered trash if it has not reached its expiration date (end of shelf life) by the end of the model and if there are no inventory policies defined for the product. The disposal cost will be reported in the Transportation Cost column on the Customer Flows output table, for a flow with a destination named "Trash" and a mode of “UNUSED PRODUCT”. If there are inventory policies defined, it is assumed that the by-product should be held in inventory, rather than trashed. In this case, an inventory holding cost may be incurred. To set this option in a scenario, select the “By-Product Disposal Cost” field and enter the numeric value for the disposal cost.

You can also define a disposal cost that is incurred when the shelf life of a by-product expires within the model horizon. Set the Disposal Cost in the Inventory Policies or Inventory Policies Multi-Period table. The cost is reported in the Flow Transportation Cost column on the Customer Flows output table, for a flow with a customer named "Trash". The mode is “EXPIRED PRODUCT”.

Risk Modeling Settings

Enable Maximum Network Risk Constraint: When this option is checked, the Constraint value is written when the model is solved, applying the maximum risk constraint to the solve.

Maximum Network Risk: This value is the maximum risk constraint applied at the network level. The value must be in the range of 0 to 100, with 0 being the lowest risk and 100 being the highest. The constraint is applied only when the Enable Maximum Network Risk Constraint is checked.

Last modified: Wednesday May 15, 2024

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