I'm in the process of making a block diagram of a mechanical assembly. I would damn myself if there was a technique to make it as clear as possible, to avoid that the connections between the different blocks cross each other as much as possible.
I did this on Excel 2010. The blocks have 4 anchor punches. I also have video but the blocks also have 4 anchor points. The problem is when you want to start more than 4 connections in a block. I tinkered and racked my brain...