Electronics > Projects, Designs, and Technical Stuff

Isolated CAN ground connection

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AndersJ:

--- Quote from: tru3533 on September 05, 2019, 10:40:28 am ---From my point of view you only need isolated CAN bus for your test equipment.

--- End quote ---

Why only for test equipment?
Why is isolated CAN not needed when communicating between distant locations
such as in industrial environments and/or between buildings with differing ground potentials.

tru3533:

--- Quote ---Why is isolated CAN not needed when communicating between distant locations
--- End quote ---

Maximum length due to Signal Propagation Time on CAN bus
1Mbps = maximum 50m
500kbps = maximum 120m


--- Quote ---industrial environments
--- End quote ---

Why do you think isolated CAN bus don't exist in a car with hundreds of sensors on CAN bus?
Answer: It works perfectly without.


AndersJ:

--- Quote from: tru3533 on September 05, 2019, 05:13:07 pm ---
--- Quote ---Why is isolated CAN not needed when communicating between distant locations
--- End quote ---

Maximum length due to Signal Propagation Time on CAN bus
1Mbps = maximum 50m
500kbps = maximum 120m


--- Quote ---industrial environments
--- End quote ---

Why do you think isolated CAN bus don't exist in a car with hundreds of sensors on CAN bus?
Answer: It works perfectly without.

--- End quote ---

1. Isolation is not used to resolve timing problems. It is used to avoid problems caused by common mode voltages.
2. A car has a common well defined ground. Isolation is not needed.

tru3533:
1. If your distant house/building is more than 50m away. CAN bus is useless on 1Mbps.
With or without isolation, that's my point.

AndersJ:

--- Quote from: tru3533 on September 05, 2019, 07:43:17 pm ---1. If your distant house/building is more than 50m away. CAN bus is useless on 1Mbps.
With or without isolation, that's my point.

--- End quote ---

Your point is taken.
But,
this thread is about isolated CAN and whether signal ground is needed or not.
Bit rate is irrelevant.
Isolation is needed for other reasons than speed.

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