No PWM outputs

[kramarczyk]

Originally Posted by Alan Anderson

Make sure that it's getting 12 volts correctly. Can you verify that the three power LEDs on the Digital Sidecar are lit? Can you measure the voltage on its Wago connector?

I measured 12.45 at the Jag and 12.45 was reported back to the DS, but I didn't check the DSC power explicitly. I will add that to my list for when I get back into the shop.

[Mark McLeod]

My only suggestions are to mod the default code to try slot 6 with a different Digital Module, and to verify the PWM cable connection orientation at both ends.

P.S. Forgot the basic one - is your battery fully charged

Have you opened up your cRIO to clean it out and add the gaskets?

Symptoms show you only seem to be missing PWM communication between the DSC and the Jags.
With the default project only pwm 1 & 2 are live - the other two should cause Jag blink.

With the correct Teleop long-on/short-off blink the System Watchdog isn't coming into play.

P.S. Even Heisenberg was uncertain about electrons...

[kramarczyk]

Originally Posted by Mark McLeod

My only suggestions are to mod the default code to try slot 6 with a different Digital Module, and to verify the PWM cable connection orientation at both ends.

I verified the orientation, both independantly and with a third party. We have some black dots at the connection points help error proof that.

P.S. Forgot the basic one - is your battery fully charged

. I thought 12.45V was 'full' enough. Am I mistaken?

Have you opened up your cRIO to clean it out and add the gaskets?

I am not sure what you mean by, "open". I took out the modules and checked for debris/bent pins. I have no idea what gasket you are referring to.

P.S. Even Heisenberg was uncertain about electrons...

Well, in principle anyway.

[Alan Anderson]

Originally Posted by Mark McLeod

Have you opened up your cRIO to clean it out and add the gaskets?

Originally Posted by kramarczyk

I am not sure what you mean by, "open". I took out the modules and checked for debris/bent pins. I have no idea what gasket you are referring to.

This really didn't get enough publicity:

http://digital.ni.com/public.nsf/all...257673007935A1

[Mark McLeod]

I keep wondering why nobody has been wondering what those black rubber things with holes in them are for.
My thought there was to inspect for metallic dust collecting inside the chassis, but it's probably a stretch.

I'm sure your battery voltage is fine. I get students measuring the voltage without putting the battery under load all the time and I like to bring it to their attention that what they measure is just surface charge.

Did you redo the DSC power Wago connections as part of your tests?

[kramarczyk]

Originally Posted by Mark McLeod

Did you redo the DSC power Wago connections as part of your tests?

Nope, I missed that potential source. I hope the fix is that simple.

Where should I have found the gasket rework originally?

[Tom Line]

Mark - you have a PM. We're just up the road from you and would be happy to help if you need it.

[kramarczyk]

So, just to close the loop, I got the problem resolved.

After walking through the system with two experienced robot inspectors, a FTA and several other folks a bystander walked up and suggested we plug the PWM's into the PWM output instead of the digital IO. *doh* This just goes to show that
a. sometimes you need someone outside the situation to solve a problem and
b. ME's on cold medicine should not be allowed to wire the robot.

Thanks to everyone for your help and support. I hope that some others found the conversation to be as educational as I did. I will now crawl back under my rock and die of embarrassment.