Modbus Ethernet

[task]

You can go to automationdirect.com/cmore but the communication is simply Modicon Modbus. Please see my original post for attachments of how the CMore is set up. It's Modbus addressing, TCP/IP set up.
Thanks,
Teri

[unclebump]

Are you using a crossover ethernet cable to connect directly to the pc from the Cmore?? Or do you have a switch/hub in between with straight thru cables. See page 1-13.

http://web2.automationdirect.com/static/manuals/eauserm/ch1.pdf

See page 5-32,33 for testing plc communication.

http://web2.automationdirect.com/static/manuals/eauserm/ch5.pdf

After reading the modbus info again, the CMORE panel should be the master and initiate all of the communication. The PXI unit should act like a modbus slave.

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YFZOCA4&l=en-US

Message Edited by unclebump on 01-23-2008 05:58 PM

Message Edited by unclebump on 01-23-2008 06:01 PM

[Tim_C.]

The first thing i would recomend is get it talking outside of labview thru something like modscan just to verify you have the connectivity.

-Tim C.

[task]

I finally got it all to work! I had an address setting in the CMore set incorrectly...stupid, but it happens, usually to me! I was going back and forth in the Automation Direct forum, trying free modbus simulators and one gentlemen had me painstakingly go through all my settings. I probably wouldn't have caught it for awhile since I'm constantly being pulled in different directions! We all know how that is.

Thanks to all for the help.

Teri

[Tim_C.]

Remeber, you may need to verify the register offset to ensure you are reading the right register.  For example the equipment documentation may list register 4000 as a certain value but when LV reads it with a setting of 4000 you may be reading 3999 or 4001 ( I get it confused). 

Best Regards

-Tim C.

[task]

Thanks Tim, I'll keep that in mind. Now on to my next problem...reading CAN messages into the PXI system using a hand-held device...I got stuck on that the other day. Hopefully I'm doing something just as stupid as the the last problem!
Teri

[Brooks.Nelson]

If at all possible could you show an example of communicating between labview and CMore?

Read and write to and from.

Thanks

[Brooks.Nelson]

Is there any way you could post an VI on how you connected to cmore screen with labview? Thank you.

[rolfk]

The thread is more than 15 years old and you queried it already 4 years ago with no reaction.