////If I tie at each node 0v that would create Ground loops between inter nodes

NO! Your routing plan showed, that all nodes are located to each other like sitting on a chain. Then, ground loops cannot be formed!


Everything would conduct to my 0v reference and I might get a Ground *BOUNCE*.

Relative to what? Application will not see ground bounce, when everything is related to signal ground.


//////But it isnt so Battery is hardly a danger only 110V DC.

So, 110VDC isn't dangerous??? And what about voltage of battery RELATIVE to bus chassis? What about leakage currents flowing from high voltage section to battery???


If frame floats should I touch the Processor chassis to it \\.

Then bus chassis would see a connection to signal ground. ONLY APPROVED SAFETY ENGINEER CAN DECIDE HOW TO PROCEED!!!!! Did you contact him already?


Any ideas using 485 parts having very high Vcm rejection so that I leave the issue of shield and run evrything on THREE wire as shown in the LINEAR TECHNOLOGIES datasheet.

First, you must find out, what allowed options you have. So again:

ONLY APPROVED SAFETY ENGINEER CAN DECIDE HOW TO PROCEED!!!!!

You are playing with the health of other people and so, you must be absolutely sure, what you are doing!!! Becomes a person hearted or killed, because you made a mistake, you will be sent into prison!

Kai