Comsoft Profibus Communication error

[Nandi]

Hi all!

I have to do a new DSC project with profibus communication. I have some trouble at the begining phase:

We ordered 2 PCI Profibus cards: http://sine.ni.com/nips/cds/view/p/lang/en/nid/204268

I've received the latest drivers (VISA 4.4.1, Comsoft Profibus VISA Driver) and the latest configurator II (1.2.27.)

I went trough the getting started: http://digital.natinst.com/public.nsf/$CXIV/ATTACH-AEEE-7E9GP2/$FILE/GettingStarted_Win_DP-Master_E.pdf

I'm using a 2m long cable without shielding and with termination resistors like this: http://digital.ni.com/public.nsf/allkb/43024D44F4AA9548862574C2004F21B8?

Everytime I run "monitoring" in configurator the 3 led (on the PCI profibus) lights up and i get a station_non_existent error.

The two profibus card is in the same PC. I've tried communicate with each other. But I tried already with a Slave Bautz motor driver too and i got the same disappointing results.

We toke a look at the communication signal with a scope and it's seems like the card doesn't put out any signal. The initalisation is o.k.. Bus configuration download is o.k. The green led is lit up. But there is no signal in different bus configurations (different masters: PCI profibus 1,2 with different slaves: profibus card, mautz motor drive).

I need some suggestion! I can't keep moving until this problem is solved. 

[Nandi]

Case solved!

Communication established after the terminating inductors removed from the cable. 

[Jochen]

Hi Nándor,

I'm glad to hear, that the system is up and running now. I guess this makes the email that you have sent to me obsolete.

Regards,

Jochen

[JohnnyR]

I have the same communication error, but what inductors are you referring too?

[Jochen]

JohnnyR,

I think Nandor is referring to the termination resistors. You need to make sure that the bus is only terminated at it's end and you also need make sure, that you build a linear bus topology and not a star configuration, which is not supported by Profibus.

Jochen