A little help regarding fire detection system...

[High Tower]

There is more relay ouput units, than the is inputs.....over engineer, plus a total mess...one addressable multi I/O would have done the job, very sad photo.

A bit like this.........

 

[tazz]

A bit like this.........

Exactly.....we sing from the same hym sheet

 

[High Tower]

LOVE IT...LOVE IT....Now find a big skip to throw it in...!!

A bit like this............

Mind you there's another 2 loop panel and another mimic to join em!

 

[Engineer54]

These days it's far better where you have a BMS system controlling the building, is to have that BMS systems fire alarm application included in the overall system package. I can remember in years gone by, complete chaos trying to get the fire alarm to talk to the BMS and visa versa, both being from different manufacturers, neither of whom willing to provide their system protocols. Thankfully that's now a thing of the past, and a distant memory worthy of forgetting!! lol!!

 

[High Tower]

E54, fire alarms do not talk to BMS systems, they share no language or protocols.

A BMS system will be equipped with usually one, or more for more complex systems, I/O unit or programable interface. The cause and effects written into the fire alarms programming dictates how these units are operated and in what circumstances. These switch one or more sets of
Contacts going back into the BMS. Multiple Chanel's can be used on systems such as the gent s-quad 4 Chanel quads that can be set as relay outputs or monitored inputs, therefore giving two way communication between the two systems. And a ability to shut down certain facilities while running up others such as extract fans.

These units are addressed onto the loop and simply change state during fire conditions, no protocol required.

 

[Engineer54]

Maybe these days yes, but not in the 80s. Trying to integrate the fire alarm with a BMS system of different manufacturers was a nightmare, we tried just about everything even trying to use an ASCII interface nothing worked. In the end we had to dump the BMS system, no great loss as it was based on an outdated technology, ...a disaster in it's own right. So ended up with the Honeywell BMS and integrated FA system. As i remember the point number on that project was in excess of 20,000, covering just about everything associated with the needs of 4 hospital buildings with a total of 1500+ beds....