RS5K Generic Ethernet Modules

[scottmurphy]

I have 18 Ethernet/IP VSD's configured as generic ethernet modules. I had a situation today, where the VSD 'dropped' off the network, we replaced the ethernet cabling, and it came right.

We are thinking it could of been a couple of things:

1. The cable was faulty/damaged, long patch leads have been used.
2. The RPI was too high (20mS), but when I changed this to 250mS, the problem was still present

The other problem I noticed, was that whilst the VSD was not connecting, the status words that I was reading retained there last updated value, this is fine, as is what to be expected.

What I want to know, is how can I determine if any particular node is offline?
I could code some sort of heartbeat I guess, but I would of thought that the node present status could be read via the software somewhere???

 

[PGilbert]

Scott,

Do a GSV - Class name 'Module', Instance Name '<the drive name in your I/O tree>', Attribute Name 'EntryStatus'. Store that in a DINT tag, then do a MVM (Masked Move) on that tag with a mask of 16#F000. If the destination tag from the MVM equals 16384 (4000h), then the drive is communicating. If not, then the drive is not communicating.

 

[scottmurphy]

Awesome, thanks very much for that. Was exactly what I was after.

Is there a technote or something that details the complete status that is returned from the GSV?

 

[widelto]

Scott. what about the switch you are using ?? This has to be managed and must have IGMP Snooping enable, otherwise your problems will remain.

 

[PGilbert]

Awesome, thanks very much for that. Was exactly what I was after.

Is there a technote or something that details the complete status that is returned from the GSV?

http://rockwellautomation.custhelp.com/cgi-bin/rockwellautomation.cfg/php/enduser/std_adp.php?p_faqid=25325 - scroll down about 2/3 of the way to see what the other numeric values mean.

 

[jimbo3123]

This is probably a dumb question, but what is a VSD?

 

[Myles]

This is probably a dumb question, but what is a VSD?

a variable speed drive. there are lots of names, like inverter, VFD(variable frequency drive). A unit which alters the supply frequency to a motor load.

myles

 

[briancr]

Vsd

VSD = variable speed drive = VFD = variable frequancy drive

OK Myles you got there before I did

 

[jimbo3123]

Thanks.

I've heard a lot of different names for them, but VSD was a new one for me.