Board-to-Board Bus Daisy Chain - Ground Loop?

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digi001

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Question For a Board-to-Board Bus structure like CAN :

---Say 4 PCBs hooked up from 1 PSU
---All PCBs Daisy Chained with CAN Bus
---Very Noisy Industrial Environment

Does it make sense to possibly isolate each CAN bus for improved noise issues and eliminate any possible ground loops?
 

BACK to basics... CAN was never designed for a common ground system as it is a distributed system with different grounds... any number of nodes there will be no common ground..

It uses differential bus technique for minimising the noise in a signal...Reducing industrial noise is left to user to do externally
 
Ok, Yes so CAN is differential and uses a Transceiver.

And say 3 PCBs are powered by 400V-DCtoDC-24V-DCtoDC-5V then 5 other PCBs powered (same)400V-DCtoDC-(same)24V-DCtoDC-12V then individual PCB Linear Regs to 5V.

All CANs are connected. Is grounding loops even an issue here?
 

grounding is never an issue in CAN BUS communication. . Is your source 400V DC... each board will have a regulator of its own and does not need common ground.

sensors can be placed anywhere in the system and have transceivers o each board that in turn are connected through CAN bus to each other... we cant expect all sensors to have a common ground...

Hope you get my point...
 
Ok yes I understand....Thanks!
 

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