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How to reconnect cFP-1804 to network

Good Morning,
I am using a cFP-1804 ethernet module, along with a DO-400 digital output. I am testing the network watchdog by unplugging the ethernet cable to simulate a lost connection. Everything functions correctly, except that the device will not re-connect to the network without a manual reset on the front button. Is there a setting that will allow it to detect when the cat 5 cable is reconnected? Currently the lights on the jack remain dark until the module is reset.
Thank you,
Mello

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Mello,

My experience with the network watchdog and the cFP21xx series is you have to reset unit after an event.  When it says "Halt system", it means just that.   I have not found a setting to get around this. 

 

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Mello,
 

This does not directly apply to you but I found this in a cFP manual.  It may hint at a somewhat limited range of function for the network watchdog.

                  Note

National Instruments recommends leaving the network watchdog disabled when

             you are running embedded applications on the cFP-21

xx. Refer to the section of this

             chapter for information about the hardware watchdog for embedded applications.

My problem is that the Hardware Watchdog functions don't show up on my Real Time palette like they used to.  Not sure where they are now. 



Message Edited by centerbolt on 12-19-2007 09:54 AM
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Thanks Centerbolt! I do have a 2120 that is running the rest of the system, which doesn't stop. The D0-400 is just running a pair of heaters, so I need them to fail-safe (off), on network loss.
 
If only the reset button wasn't 350 ft up a smokestack...Smiley Sad
 
But it seems that's the way it's gotta be. I was noticing that if I couln't even find it with MAX, so code wouldn't be able to communicate with it either. If you haven't found the command, I doubt it is there to be found.
 
-Mello

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Hopefully it's not you crawling up that stack! 

Here's a pie in the sky idea.  You might consider some sort of watchdog external to the cFP module.  Let's say you modify your setup to toggle a DO output every once in while and monitor that with some sort of hardware watchdog that disables the heaters if it doesn't see the activity.  Not sure if anyone currently makes such a hardware watchdog that is self contained. 

Message 5 of 21
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Hmm, I like that idea.

If I had some kind of rising-edge trigger, with a timeout, then a stuck-on digital output wouldn't burn up the system. The signal would then be sent periodically, telling the unit to "remain on," and the fail-safe would be in the hardware. I might run that past them.

Cheers,

Mello


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Mello:

 

There are off the shelf units that do that, you can set the time with knobs and there are digital units too. If interested, I can pass a few links your way. Omron, P&B, Crouzet are a few mfg's.

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Thanks,
I am checking out Omron right now, but some specific links would be great. I think 'safety relays' is the kind of thing I am looking for, correct?
-mello

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Off-delay and single shot timer are common terms, see explanation here in this data sheet:
http://www.alliedelec.com/Images/Products/Datasheets/BM/VEEDER-ROOT_BRAND/Veeder-Root-Brand_Industri...

 

Some examples of units in various flavors, don’t know your contact rating requirements, but there are gobs of choices out there. I didn’t look specifically for one with a DC trigger input:

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=687-8020&SEARCH=&MPN=B856%2D500&DESC=B856%2D5...

 

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=687-0025&SEARCH=&MPN=B866%2D500&DESC=B866%2D5...

 

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=793-5031&SEARCH=&MPN=88857005&DESC=88857005&R...

 

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=993-0364&SEARCH=&MPN=405A100F1X&DESC=405A100F...

 

http://www.alliedelec.com/Search/SearchResults.asp?N=0&Ntk=Primary&Ntt=519-0170&sid=47685F007438617F

 

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=687-0211&SEARCH=&MPN=B90D%2D500&DESC=B90D%2D500&R=687%2D0211&sid=47685F003646617F

 

 

Hope this is the direction you need

 

-AK2DM

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I think the AnalogKid is on to something.  Here is a link to a Magnecraft part that has a 'Retriggerable One-Shot' mode that would be perfect as a watchdog.

http://magnecraft.thomasnet.com/item/all-categories/relays-time-delay-and-sensor/pn-2927?&plpver=10&...#

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