The internal and external router blocks are drawn like the other graphical blocks (activities, data stores, and so on) in the activity chart editor. A default name for the router block is automatically displayed after you draw the block. The name can be changed. For more information, see Setting Router Preferences.
Flow Lines can be drawn from a router to an external router, activity, external activity, data store, control activity, or another router.
This is an activity chart that does not use the router. As a result, the chart has an abundance of flow lines going to, from, and even crossing one another to reach their various activity destinations.
This chart uses two router blocks to effectively route the signals going between the external activities and the internal activity blocks.
This chart illustrates the differences between an internal and external router. In the main diagram, router_1 and router_2 are both internal. However, in the perform_release_gen activity, router_1 and router_2 are external routers.
Note: To provide a detailed interface description of those signals, and where they are flowing to and flowing from, use interface reports. For more information, see Interface Reporting.