Standard/Recommended Practice for Discrete I/O in Aircraft Application
Standard/Recommended Practice for Discrete I/O in Aircraft Application
(OP)
Hi all,
I'm wondering if there is a standard specifying voltage levels for aircraft use of Discrete I/Os?
IE: Gnd/Open would be:
gnd, logic 1
open, logic 0
logic 0 lower limit: 12VDC
logic 0 upper limit: 48VDC
logic 1 lower limit: -2VDC
logic 1 upper limit: 5VDC?
Same question for 28V/Open...
Any ideas?
thanks!
I'm wondering if there is a standard specifying voltage levels for aircraft use of Discrete I/Os?
IE: Gnd/Open would be:
gnd, logic 1
open, logic 0
logic 0 lower limit: 12VDC
logic 0 upper limit: 48VDC
logic 1 lower limit: -2VDC
logic 1 upper limit: 5VDC?
Same question for 28V/Open...
Any ideas?
thanks!





RE: Standard/Recommended Practice for Discrete I/O in Aircraft Application
The DEI company has several chips which were made specifically to comply with most airframe system spec. I've used these for avionics which had to interface with 28V/open logic for various airframe mfg's.
RE: Standard/Recommended Practice for Discrete I/O in Aircraft Application
We are aware of the Do-160 reqs.
Thanks again!
RE: Standard/Recommended Practice for Discrete I/O in Aircraft Application
I believe it embodies fail safe principles, i.e. recognize sooner or later all wiring fails, a fail open to keeps critical systems active.
RE: Standard/Recommended Practice for Discrete I/O in Aircraft Application
You might look at ARINC 607-3 - DESIGN GUIDANCE AVIONIC EQUIPMENT