Modern embedded systems

[JosephLJ]

Just wanted to gauge what communication protocol (physical and logical) people would use on a distributed embedded system. Higher data rates for telemetry are better.

 

[Deleted member 1476601]

Personally, I’d go with:

But in reality, it really depends on the requirements and your application. Cost, distances, environment, number of nodes, redundancy, real time performance, ease of implementation, etc…. Can you share more about the application?

 

[JosephLJ]

Lmao, its for active control of a fluid system, multiple sensors, actuators and various commands and states. Redundancy is needed, it should be real time and I dont mind about ease

 

[Deleted member 1476601]

Given it’s control I’d go with RS485. Simple and cheap cabling and redundant. Choose a fieldbus that works for your hardware and you’re comfortable with and meets the speed req. OPCUA? Modbus? CAN?

If hardware and cost support it, redundant Ethernet will cost more but be more performant. And you can still run OPCUA or Modbus TCP/IP on top. And for more $$$, if you really need real-time motion control go ProfiNET and replace your embedded hardware with a distributed S7 system.

 

[JosephLJ]

Okay that sounds along the same lines as I was thinking, we are upgrading from a CAN system, so I was thinking redundant 100Base-T1, single pair redundant ethernet. We are pretty size and weight constrained so I was heading towards like a micro-fit connector rather than a RS485

 

[Deleted member 1476601]

That sounds reasonable, especially if already on CAN and you’re upgrading. Good luck with the project.

 

[JosephLJ]

Do you have any other physical connector suggestions? Ideally we need something that will withstand some heavy vibrations and forces while being small.

Thanks

 

[Deleted member 1476601]

Without knowing what your connection looks like, given high vibration, I’ve used Deustch, Amphenol, and Harting in extreme vibration environments in the past with success. Oh, Cannon as well. I’m sure they have something. Especially as Deustch specializes in automotive and 100 base/t1 lends itself to that.

 

[Deleted member 1476601]

Without knowing what your connection looks like, given high vibration, I’ve used Deustch, Amphenol, and Harting in extreme vibration environments in the past with success. Oh, Cannon as well. I’m sure they have something. Especially as Deustch specializes in automotive and 100 base/t1 lends itself to that.

wago and weidmuller have rugged connectors if you’re looking for pcb mount. Phoenix contact as well.