In this lesson:

PPR Structure

The starting point of EWD is a PPR structure. Here is an example of a PPR structure that is working with EWD:

You can see the following elements in this structure:

1. A Product node
2. A Resource node
3. A EWD resource node (this node is automatically created by EWD if the application doesn't find a footprint to indicate the floor)
4. A MBOM node
5. A process node (a general system in the example above)

Process Guideline

Your objective when using EWD to evaluate the safety of your production line.

In order to do that you need to have 3D context as close as possible to the real physical environment on which the worker is going to perform his work.

Right 3D context

In order to have the right 3D context on your operations:

1. Use flow links to 
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2. Assign: operation position, resource position & part position to your process that have an accurate 3D context at each step of the assembly
3. Assign resources to operations. This is not mandatory to create worker tasks, but it will speed up the worker task creation process because the default Worker task sentence will use that as an input.

Right Data structure

Here are some guidelines for you when defining your process structure:

• Use 1 general system by worker (When doing task time analysis, the application is only considering the operations under the selected general system)
• Don't use parallel structure in your process. It doesn't make sense for the worker to do 2 tasks at the same time. (The only way to use parallel structure is if you define loading operations, but make sure to have 1 operation with all the part at there assembly position)
  
• Avoid using workplans in your process structure

Workplan VS General System

When launching EWD, the app will follow this rule to open the process:

1. EWD looks for a general system. It opens the first general system found
2. If there is no general system. EWD look for a workplan and will open it.

So do not mix general system and workplan to avoid any problem!

Resources

When defining resource in your PPR, you do not have to define 1 parent resource node. EWD will consider all resource nodes below the PPR node.

If a resource has a motion controller, you will be able to use it inside EWD:

Tracks assigned to resources won't be considered inside EWD.

Manikins

If you have other manikin saved inside your PPR structure. They will automatically be hidden at EWD opening.

EWD manikins are transient, it means that they are not saved under the PPR structure.​​​​​​​Fas