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Re: CRIO-FRCIII
Quote:
Originally Posted by yash101
This could be a feature added into the roboRIO control system before it is deployed, so I think it might be a bit too early to say that it will be very hard for them to do.
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I prefaced my previous post with "my response is speculative" so as to not have people assume it to be fact. I am not a representative of FRC, FIRST, or NI, and the statement I made in that post were purly based on my experiences thus far with FRC (based on 10+ years).... However, without side-tracking this post too much I will entertain your comment and offer this:
First, I never said it was hard for them to do. But I speculate it is additional work they will not likely do, as it requires more changes, with not a lot of benefit. As a FRC member about to experience a control system transistion one would advocate that FIRST should focus on a seamless transition, not adding more complexity to the mix. Please re-read my previous post if it was unclear. I stated "While it is possible for FIRST to pull off something like what you suggest, I think it is very unlikely that they ever will." I never said it was hard. Try not to misquote.
Quote:
Originally Posted by yash101
My point is so they can detect fatal faults to keep the robot safe. What if a motor/controller combo shorts out and pulls 120 amps? The FMS might be able to shut it down instead of allowing the breaker to open, thus crashing the entire bot! !
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Fault detection is to keep people safe first, robot safe second. Since you are presenting this system as a good idea, you must be able to articulate how it works. If I understand correctly, you wish FMS can "shut it down" in lieu of a breaker being tripped. You would replace a mechanical device (a breaker) with a control system. As a control engineer or System designer, you need to think about reaction time, bounding limits, false detections, etc. Do you believe your control system will react faster then a mechanical breaker in the case you describe? What if the short was on the roborio - such that comms were lost. What is the reason you wish to agument the breakers? I believe the mechanical system wins!
What about instances when you power the robot on and don't have a driverstation connected? What does your system do in that case? The breakers still function but FMS doesn't
Quote:
Originally Posted by yash101
I think 75% of a robot is better than 0%. At least the robot will be able to drive around and possibly defend and use it's other mechanisms to score!
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However for conversation purposes, Lets say we could augment the system and have FMS current monitoring in the loop. How do you plan to shut down a channel on the PDP, while allowing other channels to operate? This functionaility does not exist. If the breaker is inline, and not tripped, power will still be provided, nothing in software can prevent this currently. The channels are not individually controlled. I believe your statement of "the FMS can shut it down instead of allowing a breaker to open" is backwards. If a breaker opens, the rest of the robot still gets power. If FMS shuts the robot down, the whole robot goes down.
I am not sure what you mean here. Or how the system you describe actually works. Please think about the questions I ask, and try to rearticulate your system and how it behaves in those scenarios provided.
These questions are not to shot your ideas down so please do not take them that way. I ask them so you can be prepared to answer them as you articulate how the system you describe works.
Hope this helps,
Kevin
__________________
Controls Engineer, Team 2168 - The Aluminum Falcons
[2016 Season] - World Championship Controls Award, District Controls Award, 3rd BlueBanner
-World Championship- #45 seed in Quals, World Championship Innovation in Controls Award - Curie
-NE Championship- #26 seed in Quals, winner(195,125,2168)
[2015 Season] - NE Championship Controls Award, 2nd Blue Banner
-NE Championship- #26 seed in Quals, NE Championship Innovation in Controls Award
-MA District Event- #17 seed in Quals, Winner(2168,3718,3146)
[2014 Season] - NE Championship Controls Award & Semi-finalists, District Controls Award, Creativity Award, & Finalists
-NE Championship- #36 seed in Quals, SemiFinalist(228,2168,3525), NE Championship Innovation in Controls Award
-RI District Event- #7 seed in Quals, Finalist(1519,2168,5163), Innovation in Controls Award
-Groton District Event- #9 seed in Quals, QuarterFinalist(2168, 125, 5112), Creativity Award
[2013 Season] - WPI Regional Winner - 1st Blue Banner
Last edited by NotInControl : 28-03-2014 at 17:59.
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