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Thread: FX-15 Heartbeat
09-10-2008, 02:12 PM #1Waiting Email Confirmation
- Join Date
- Nov 2007
I am currently programming a job with 2 units ac units lead/lag. One of the criteria to switch over is heartbeat failure. I am using lon FX-15s and a FX-40 communicates to both controllers. My main question is what constitutes are heartbeat failure in a controller and is there a point that lets me know of a heartbeat failure. I should be able to link that point to a snvt to turn on my lag unit. Any feedback will be greatly appreciated.
09-10-2008, 02:28 PM #2Professional Member
- Join Date
- Dec 2007
If you use the system resources block, there is a BMS comm failure attribute. It is a 10149 data type. 0 = normal, 1 = comm failure. Don't know if this is exactly what you're looking for, but I hope it helps.
Last edited by The Reaper; 09-10-2008 at 02:37 PM.
09-10-2008, 07:00 PM #3
Create a point within the device that sends every? Below your heartbeat time, if X amount of time elapses in the Jace, switch and create an alarm.
"OR" just use the comm failure and create an alarm.
Either way, "IF" in the Jace, both points fail/alarm/whatever, enable both, if you can.
Come to think of it, many points just end up hanging up in FX LON, so you could be screwed either way, so if your just interested in those 2 points, perhaps create a custom program object to do a force read/write on a timed interval as well.
Then again, its thought that counts right? So just use the comm failure, that's the simplest and maybe say a little prayer or something?
Good luck with the FX LON, BTW