A SysML IBD of Bass Guitar Effects

Based on some feedback from a previous post, I created a SysML Internal Block Diagram to show the power connections between the various parts of my bass guitar effects setup.

UPDATE

I received even more feedback about the IBD using object instances rather than properties.  Both are legal on an IBD, but object instances are a poorer choice because they don't express the context inherent in a property.  The context is the block (ex, "Carl's Bass Effects") and it can be applied to part properties, shared properties, and reference properties.

The corrected IBD is here.  I retained the original IBD, but marked it as obsolete in this post.

START ORIGINAL POST

In the previous post, I created a Block Definition Diagram of my bass guitar effects. A reader suggested I push the details of that particular BDD onto an IBD.  The revised BDD appears at the bottom of the post; this is the continuation of the effort which introduces another SysML diagram type.

IBD

A SysML Internal Block Diagram is used to show the internal structure of a block.  In Sparx Systems EA, an IBD is associated with the block that it is describing.  Starting with a block "Carl's Bass Effects" on a BDD, right click and select New Diagram > Internal Block Diagram.

Adding a New Diagram to a Block

A blank diagram will be shown (an IBD).  Navigating back to the BDD, you'll find the block that owns the IBD marked with a pair of connected circles.  This indicates the hidden details of the IBD.  Double-clicking on the block will display the IBD rather than the usual behavior of displaying the Properties dialog.

To add blocks to the IBD, drag from the Project Explorer.  When prompted about how you'd like the block represented, select "Instance (Object)" so that any ports are displayed with the block.  Use "All" for the Structural Elements which includes the Ports.

Select Instance(Object) to Display Ports with the IBD Blocks

Now, draw port-to-port connectors showing the flow of power.  Each connector is named.  Each connector is a physical cable with a certain polarity.  Because of the standardization among effects pedal jack sizes, I've left off additional information about the cable.

 Internal Details Relating Blocks of Bass Effects: Shouldn't Use Object Instances 

It appears there's a bug in Save As Image related to the IBD frame; it's drawn twice.  I can right-click on the diagram background and select select Hide Diagram Frame, but unfortunately, that would pull off the Wall port that's hanging on it.  This isn't a problem with saving as a PDF, which is how I usually transfer diagrams to clients without EA.

Many thanks to Stephan for the suggestion to divide these up.

UPDATE

Instance usage from the spec.

IBD Example from SysML !.3