Communication / Networks
Profibus spur line cable for 12M PG connection
Thread Starter: zeemens Started: 6/2/2011 11:36 PM Replies: 9
6/2/2011, 11:36 PM
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Dear all!
Has anybody knows what is so unusual in cable 6ES7 901-4BD00-0XA0 ? Why it better than a pair of profibus connectors with, let say, 3m of standard or flexible Profibus cable between, i.e. home made cable, that is easy to make even on site? I've tried to found a cable diagram for it, without success. Flexible cores is the clue ? Let me know what is the difference. Thanks!
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6/3/2011, 3:33 AM
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Hello zeemens
the 6ES7901-4BD00-0XA0 cable may not look like much, but is quite special indeed.
It is specifically designed to allow the connection of a PG to a Profibus Networks for speeds up to 12 Mbps.
The "bigger" 180 deg Metal Plug on one end of the cable has some "smarts" in it (mini repeater) which isolates the 3 meter Spurline from the bus to avoid avoid the creation of Spurline (even though it looks like a Spurline, it actually isn't) and you'll find additional info in the thread below:
Spur line with a transfer rate of up to 12 Mbit/s
Note that the product picture in THIS link is wrong and does NOT show the correct cable which is where the confusion may come from, see the attached pic for the "real deal".
If you use a "homade" Profibus cable and Plugs to connect your PG (or laptop with for example CP5512) to a running Profibus Network it would create a Spurline which has a good chance to take your bus out of action if operated at higher baudrates.
The other advantage of the 6ES7901-4BD00-0XA0 cable is that its flexible cable make it easier to travel with you in Laptop bag and last longer.
I hope this helps.
=== Edited by fritz @ 6/3/2011 3:56 AM [GMT ] ===
added pic
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Cheers
fritz
The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited.
To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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6/3/2011, 9:02 AM
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12M?
Selfmade Will not a good idea because you have no termination.
May be it work, may be not.
Very high chance of disturbing the Bus.
1.5M may be is OK....
=== Edited by IBN-Service @ 6/3/2011 9:04 AM [GMT ] ===
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6/15/2011, 6:30 PM
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the 6ES7 901-4BD00-0XA0 cable may not look like much, but is quite special indeed.
...
Thanks to fritz (and my curiosity) I just bought this cable, and would like to show you what's inside. As you can see there are:
- 2 separated Profibus lines controlled via RTS-PG (!) from PG side
- 2 stright lines for 24VDC
- 1 stright line RTS-AS
- 1 stright lien for 5VDC ground
- 1 internal line for 5VDC positive
So, in total there are 7 pins connected on PROFIbus side and definitely it is far from ordinary PROFIbus patchcord. Amazingly Siemens added a shematic for it (attached), while I could not found it on internet. I hope it will help to whom it may be useful.
cheers, Zee
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6/15/2011, 6:40 PM
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hey, Z-man,
how mutch is it?
Do you test it with Profibus DP 12M already?
=== Edited by IBN-Service @ 6/15/2011 6:45 PM [GMT ] ===
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6/15/2011, 6:57 PM
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Ordinary price is XX€, but, of course I got it with discount. Cannot say how much, otherways my distributor will never give me discount any further :). Now I think it is worth its price. There is no generating spur line at all and it can work with PPI/MPI/DP as 6ES7 901-0BF00-0AA0. I did not tested it yet, tomorrow morning will do this in plant with heavy load bus (more than 20 nodes, about 40 m in total). Surely will inform about my suggestions.
cheers, Zee
=== Edited by O_Moderator @ 6/17/2011 10:41 AM [GMT ] ===
price deleted. the right price for you is only given to you by your local siemens salesman
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6/15/2011, 8:30 PM
6/15/2011, 8:48 PM
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Heksu,
It's good to know. I will certainly deal with the problems like that. That's why I spent 2 working days to determine whether to buy 901-0 or 901-4. And thanks to this forum I choose better one. Now I know wny it is and I thik that RTS-AS is more important than we all think. Now I would like to determine that either it is useful just for SOME routers (like experts say), or for some other needs. That's why I published this manual. I always curious why it is used until I known basic reasons.
cheers, Zee
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6/15/2011, 10:20 PM
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Thanks to fritz (and my curiosity) I just bought this cable, and would like to show you what's inside....
Dear all,
Following my curiosity I have translated manual that I found into english. As you can see the strange is that:
- it is dated on year 1996
- it is talking about Sinec L2
- it is misunderstable talking about Routers
So I got some additional questions:
- I know that on electrical level PB is the same like SINEC-L2, but maybe some RTS wires are specially for dealing with SINEC-L2, not used now?
- Why it is written "repeaters avoided"?
cheers, Zee
=== Edited by zeemens @ 6/15/2011 10:29 PM [GMT ] ===
Cable of mine is Ausgabestand (Last revision) = A03
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5/25/2012, 8:14 AM
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This thread has been very useful.
Shame I only found about it by accident, it's rather hard to find for those who need this information.
In my opinion, the product page for 6ES7901-4BD00-0XA0 should definetly have some of this information there.
I have the mentioned cable, but it has recently broken. I opened the metal side of the cable, and was confused by the circuit board there. Since I thought the cable was a simple profibus cable, like the product page says, and since the metal end looks somewhat "unfinished", with one empty hole for additional cable, I actually thought this was some custom made cable, made by person unknown. Specially since the picture on the product page shows incorrect cable.
I even asked my local Siemens office, and they claimed that since my cable has a metal end, it can't be original 6ES7901-4BD00-0XA0, since it has 2 integrated plastic ends. They were of the opinion that this was a custom made cable, made by some earlier employer in my company. After submitting a picture of my cable to them, they chanced their minds, and said:
"It indeed seems to be an old Siemens cable. It's propably from a time before the name Profibus was taken to use. I think it was named L2 bus at the time."
(Text translated from Finnish). However, this indicates that the incorrect picture and the missing information on the product page is affecting even Siemens staff.
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