2018-06-16 EMS Isolates Itself Off

From FB group Bell Telephone

That reminds me of the EMS we had at the college. The original system used RS-485 around campus. So they started using IP over the network.

So at the end of Friday in the hot summer, the Energy Management System tells the A/C units on each bldg to shut down. On Saturday and Sunday the network switches overheat in the closets and shut down, so Monday morning the EMS can’t communicate with the controllers on the A/C to tell them to start the A/C. Instructors open the classrooms and they’re all hot and stuffy.
Brilliant! 😣

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