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Unused Zones

Deltaseven
in Control Panels (Public)

Featured Replies

When using EOL, what is the purpose behind linking out unused zones at the panel? The zones are obviously isolated in the panel programming. One of our engineers was expounding his theory that open unused zones (no resistors) can cause feedback to used (and correctly wired) zones. We mainly use Castle Care-tech kit, and they have no requirement to link out unused zones and I have not noticed a problem.

I must confess that I can't see how this interference would come about. The way I see it, each zone is completely isolated from all the others, and only share a common ground. Any thoughts?

D7

The only benefit I can see for linking out unused zones on an EOL panel would be that the resistors are there ready and waiting if the system is ever expanded.

ACE.gif

There`s no purpose to linking out unused zones on an EOL system. Its just an old habbit many engineers have from the old NC loop days.

........................................................

Dave Partridge (Romec Service Engineer)
And your always gonna have the correct resistors on site if you need them.

Pete

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Gee, man.. I have a huge box of different kind of resistors in the car.. Enough to make any size resistor if something is missing.. This of course only if our "resistor supplier" has already closed and I have to make alarms working for the night..

galaxy advise you put EOL resistors in any unused zones on board / on RIOS , it helps to keep system balanced and helps tp prevent f/a i think !

THE BLACK KNIGHT

"Any comments / opinions posted are my opinion only and do not represent those of my employer or Company."
galaxy advise you put EOL resistors in any unused zones on board / on RIOS , it helps to keep system balanced and helps tp prevent f/a i think !

25709[/snapback]

I think that also DSC advises that you put EOL in unused zones. Though my guess is that it is very marginal amount of FA/trouble this prevents.

Black Knight is right about the galaxys. I was told to close unused zones as open collectors can pick up interference.

The opinions I express are mine and are usually correct!

(Except when I'm wrong)(which I'm not)
Black Knight is right about the galaxys. I was told to close unused zones as open collectors can pick up interference.

25823[/snapback]

Just a lucky guess, but I don't think that zone inputs are open collectors... PGM:s are usually, but not the zones..

Open collectors are used to pull to ground when activated (small voltage to the Base). And common is same as ground. (dont mix this with earthing, nothing to do with that though it can be earthed in some PCB:s)

So there is nothing to measure then between the com and com (0 and 0)..

Edited by georgahti

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