Open topic with navigation

Add Logic and Shifts to the Model

By defining your shape's properties, you have already added basic logic to your model. Now, we will use the Logic Builder to add advanced logic to some of our activities for resource usage and incrementing and decrementing the WIP variable.

Additionally, we will assign shifts to our resources and some of our activities in this topic.

Adding Advanced Logic to Activities for Resource Usage

For simple resource usage, we have assigned resources for work on entities at certain activities using the Resource field in the Activity dialogs. For example, this was the case for Op 30 Install PCB.

However, Op 20 and Op 40 requires more advanced resource logic. In this case, we leave the Resource field blank, and then use the Logic Builder to add more advanced resource usage logic.

To begin, Line Op 1 does not need to be used at the Op 20 activity for its entire processing time; therefore, we do not want to simply put Line Op 1 in the Op 20 activity Resource field. Instead we will use the Logic Builder to specify that the resource is to be used for only 10 minutes to load the oven.

1. Right click on Op 20 Vacuum Bake, and select Properties to open the Activity dialog.
2. Click on the Logic button to open the Logic Builder.
3. Double click on the USE statement on the left side of the Logic Builder. This statement allows you to assign resources to work on entities at activities.
4. A dialog will appear showing the available options for the statement. For information on this dialog, press F1 while using the dialog.

5. Fill in the fields of the dialog as shown in the image above.
6. Click OK to place the statement (Use Line Op1, 2 For 10 min) in the logic builder.
7. Close the Logic Builder  to save the logic.

Next we will enter a different method for capturing, using, and then freeing multiple resources at activity Op 40 inspect and Test.

1. Right click on Op 40 inspect and Test, and select Properties to open the Activity dialog.
2. Click on the Logic button to open the Logic Builder. If you made an error, you can edit the statement by double clicking on it.
3. Double click on the GET statement on the left side of the Logic Builder. This statement allows you to capture resources to work on entities at activities.

   

4. Fill in the fields as shown above (be sure to check "Get resources jointly") and click OK.
5. Next, double click on the WAIT statement, enter a Value of 25 with time units of minutes,and click OK. This will cause the resource to work on the entity for 25 minutes.
6. Finally, double click on the FREE statement, choose ALL for the Resource value, and click OK. This will free the resources after the 25 minutes, so they will be available for work on other entities.
7. Double check that the Logic Builder contains the following lines for Op 40:

   

8. Close the Logic Builder to save the logic.

Adding Advanced Logic to Activities for WIP Variable

We will now add the logic to increment and decrement the variable Assy_WIP as the Assy entities arrive and leave the process.

1. Right click on the Op10 Clean and Prep activity, and choose properties from the right-click menu.
2. From the properties dialog, click the Logic button, which will display the Logic Builder.
3. In the list of statements, double click on the Inc option.
4. From the Inc dialog, select the Assy_WIP variable, and then click OK.

This will cause the Assy_WIP variable to increment by one each time an entity enters the process. We will now enter a Dec, so that the variable counter will decrease by one each time an entity exits the process.

1. Right click on the exit connection leaving Op 50 Record Unit Statistics, and choose properties from the right-click menu.
2. From the Routing dialog, click the Logic button, which will display the Logic Builder.
3. In the list of statements, double click on the Dec option.
4. From the Dec dialog, select the Assy_WIP variable, and then click OK.

Adding Shift assignments to Resources and Activities

All resources, except the Inspector and the Test Unit are available 8 hours per day, from 7:00 AM to 3:30 PM, with a ½ hour unpaid break from 11:30 to 12:00. These resources are not allowed to work overtime, so they leave immediately when their shift is over.

Adding shift assignments is done by:

• Open the properties dialog for the resource or activity.
• Click on the Calendar button.
• Click Browse to enter the path to the shift file.
• Select the appropriate .pmcal file, which is in the same directory on your computer as the Tutorial.vsd file.
• Repeat for all resources.

Assign shifts to resources and activities according to the following specification: Shift Assignments