3 Wire Loop Configurations

[sysengineer]

Just wondered if anyone can offer some analysis on the following configurations for a 3-wire transmitter circuit? I have recently been presented with an unfamiliar configuration whereby the sensor 0V is distributed back on two leads resulting in a pseudo 3 wire arrangement using 4 lead wires in total (see Figure 1).

In my previous experience with 3 wire configurations the 0V terminal has one connection. I'm attributing this to bad design as my gut feeling is there is something wrong with this circuit but I can't explain why. I'm thinking there could be issues with potential differences in signal ground but I'm stuck.

Can anyone offer some analysis?

 

[itsmoked]

You can use the

so everyone doesn't have to clickclickclicketc

I'm guessing but the 'A' seems to cancel the wiring voltage drop from the supply which might otherwise affect the signal.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[roydm]

Configuration A is better don't you think it doesn't suffer Voltage drop caused by the excitation current for the transmitter.