A normal mechanical assembly (see the diagram) specifies some mechanical parts and how to join them. You can use it to produce many units of the same type.
A COPP-assembly type is similar. It specifies some COPP-types and their connections that perform a certain function. It could be a mixer of tanks, valves, and recipes for example.
The main assembly can contain:
– Other assemblies
– Devices (representing physical modules)