Asprova MRPCommand execution authorityObjects for which data input/output is allowed for each module
Asprova MRP performs MRP calculation at ultra-high speed. Scheduling results will be output to the Purchase plan, Order table and Operation table.
For long-term scheduling, more precise results can be obtained by finite capacity schedule in Asprova APS or Asprova MS; however, if you prefer to start operation with more simplified Integrated Master settings and are more interested in calculating the required material quantities rather than scheduling, Asprova MRP would be perfect.
Use the "Assign MRP" command to calculate the required quantity and perform other MRP treatments.
Characteristics of the assign MRP command
- The assignment type is "infinite capacity.” The setting of the “assignment type” scheduling parameter is ignored.
- After backward assignment, operations that exceed the assignment start time and the next process operations pegged to these operations are forcibly assigned forward with infinite capacity.
The setting of the “assignment type” scheduling parameter is ignored.
- The dynamic split settings are ignored.
- The settings for setups dependent on prior or subsequent setups are ignored.
MRP command structure
The basic command structure of the scheduling parameter when using MRP is as follows:
|Prepare for assignment|
|Assign privileged operations|
To set the master data for using MRP, specify the master input instruction (and master output instruction if necessary) in the Integrated Master for finished items and manufactured parts, as well as required quantities and connection between items.
You can set them in the “Production lead time” property and “Resource” property (located on the Settings tab of the Property window) items without setting the master use instruction.
Production lead time
Specify by an expression the production lead time of the given item. The default value is "1 day".
Use the master use instruction in the Integrated Master, if it has already been specified.
Specify the target resource for which the given item will be assigned and the production lead time will be calculated.
Use the master use instruction in the Integrated Master, if it has already been specified. If the master use instruction or capacity value is not specified in the Integrated Master, and if the assignment resource (MRP) is left blank, a resource with the code "MRP" will be automatically generated and used.
When the MRP resource is first generated, a calendar (to run 24 hours every day) will be automatically generated as well.
This calendar is only generated at the beginning, and once it is deleted, it will not be automatically generated anymore. This calendar is only generated at the beginning, and once it is deleted, it will not be automatically generated anymore.
Examples of MRP use patterns
While keeping the master data to the minimum, only the required quantity will be calculated.
Points on setting:
- Specify only one process each for finished items and manufactured parts in the Integrated Master and Specify the Master input instruction.
- Specify the "Production lead time" of each item.
Example of production lead time
|Fixed value:||3d (3 days); 10h (10 hours)|
|Non-fixed value:||50ph (50 units per hour)|
If non-working days and working hours are to be taken into consideration, register the resources in the items' "Resource" property and specify the calendar for each resource.
See below the scheduling result after inputting only one process each for finished items and manufactured parts, specifying the items' "Production lead time" and resource properties and using the assign MRP command. The required quantity and approximate time period of each item can be calculated.
By specifying detailed master data (including process and capacity), more accurate period calculations will be performed.
Points on setting:
- Create the actual master data for finished items and manufactured parts in the Integrated Master. Specify not only master input instruction but also master use instruction.
- Specify the actual working time in the calendar for the resources specified in the master use instruction.
- Enter appropriate capacity values in the master use instruction.
See below the scheduling result after specifying in detail the processes and master use instructions of finished items and manufactured parts in the Integrated Master and using the assign MRP command. More detailed date can be calculated this way compared with using the production lead time property and resource property of items.