Compatability problems between NI-FBUS and Rosemount DXR375

[Alfredo_Matus]

Hello,

Some time ago I had the chance to use a Rosemount DXR375 FF handheld, which I hope is familiar for most instrumentation users. Well, I was using Configuration 2.3.6 and I had problems when I hooked up the DXR375, like having other devices going offline or even dissapearing from the network. I have tried to match the communication parameters, (T1, T2, T3, slot time, etc.) but I was not able to use DXR375 in combination with NI-Fbus in sa safely way. Please note that both FF interfaces (NI-FBus Configurator and DXR375) work properly when used separately, but as soon as they are together, conflict appears.

I would like to know if somebody at the forum have good experience with DXR375 in combination with NI-Fbus.

Thanks in Advance,

Alfredo Matus

Service Manager

Endress+Hauser Chile Ltda.

[fieldbus]

Hi Alfredo,

I guess you were using PCMCIA-FBUS card, right?

Did you try to set the H1 port as Basic Device with a visitor address in the Interface Configuration Utility? According to your description, the problem might be caused by node address conflict or LAS conflict. 

Regards,

Sean Gao

[Alfredo_Matus]

Sean,

Thanks for your reply. Yes, I was using my PCMCIA/FBUS Series 1 and I have not tried to use it as a Basic Device. Unfortunately the DXR375 was customer's property so I cannot reproduce the problem in my office. Anyway I will keep this in mind for the future. I would like to know if you have tried with DXR375 in combination with PCMCIA/FBUS and if a conflict can occur. My feeling is that both devices are polling the network at the same time and this disturbs its behaviour, but that can also be due to wrong settings.

Regards,

Alfredo

[fieldbus]

Alfredo,

To be honest, I am not clear the relationship between DXR375 and Emerson 375 Field Communicator device. But if you are talking about 375 Field Communicator, I had ever put NI interface card together with it in the same H1 segment before, and as I remembered, the devices on the segment worked properly and I was able to read data from NI-FBUS Configurator software.

However, as I know, the 375 Field Communicator normally works in a vistor address and will not conflict with LAS device, thus the PCMCIA-FBUS card is able to work well with it.

I think the best way to find out the problem is to have another NI interface card with NI-FBUS Monitor software if it is possible; with the Montor software, you can simply know whether there is conflict in node addresses or bus communciations.

Anyway, please feel free to contact us at fieldbus.support@ni.com if you want to have further discussion about any conflict issues.

Regards,

-- Sean

BTW: If you need any help to upgrade your Series 1 card, just let me know.

[Alfredo_Matus]

Sean,

Thanks a lot for your answer. I am referring to Emerson Field Communication 375, so you were right. OK, seems to be only a matter of checking addresses and comm. parameters. I will try next time I have the chance. Regarding upgrade, it is already organized with my local NI rep. I will send it to them on March to do the exchange, cannot do it earlier because some jobs.

Best Regards,

Alfredo.