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45km between S7-400 and ET200

Thread Starter: kee   Started: 8/16/2006 4:31 AM   Replies: 5

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  8/16/2006, 4:31 AM
kee
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Hi,

Does anyone know what do i need to do if my project needs to use PROFIBUS to communicate between a S7-400 station and ET200 which is 45km away from it? The 45km FO (underwate) FO is a single FO without splice.

From what i know, OLM only supports upto 15km with 1310nm(FO) and 0.5db/km. Can I still use the OLM for the connection if my distance is 45km but 0.2db/km FO losses?

What is the alternative methods for this? In my project, timing of signal is critical issue.

kee



=== Edited by kee @ 8/16/2006 4:42 AM [GMT ] ===
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  8/16/2006, 2:57 PM
J_Bell
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Dear Kee,

I am really sorry, but I guess that this will be something you will have to try on your own risk. The experience I made till no says that such experiments do not work but you can surely try.

What I know is that if you have Fiber of the type 62,5/125µm or 10/125µm you have a max. Frequency attenuation of 10 dB (62,5µm) or 8 dB (10µm) @ a wavelength of 1310nm. If you achieve this with your Connection try it.

Just as an Idea the frequency attenuation of a Fiber differs on the wavelength.

Best regards

J_Bell
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  8/16/2006, 8:21 PM
Late
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kee wrote:
Does anyone know what do i need to do if my project needs to use PROFIBUS to communicate between a S7-400 station and ET200 which is 45km away from it? The 45km FO (underwate) FO is a single FO without splice.

From what i know, OLM only supports upto 15km with 1310nm(FO) and 0.5db/km. Can I still use the OLM for the connection if my distance is 45km but 0.2db/km FO losses?

What is the alternative methods for this? In my project, timing of signal is critical issue.


Hi kee,

I think that this is not possible....

Another solution is a SINAUT solution, when you have the opportunity to place a smal CPU and a Radioset then you can send the signals true the air.

A TIM 4V on the S7-400 side and a TIM 3V IE on the S7-300 side. Then a radioset on both sides and you are in the air.

When you don't have the FO cable already then you can save a lot of money.
I hope that the answer will help, if you have still questions, don't hesitate to ask me.

All the best, Late
Never say never, think in solutions, not in trouble......
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  8/17/2006, 4:34 AM
kee
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Hi Late,

Thanks for the information. But SINAUT, TIM 4V on the S7-400 side and a TIM 3V IE on the S7-300 side, can they still meet the >100ms switching timing which Profibus OLM is able to provides? The SINAUT you are refering is running using GSM? What happen if a critical signal to shed the other side of the plant, Is it fast enough to do so?

When we talk about wireless, common questions will be asked by customer, "how is the security and is it reliable of the communication?" any advise?

regards
Kee
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  8/17/2006, 12:42 PM
J_Bell
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Dear Kee and Late,

I was just talking to one of my colleagues of SINAUT and he told me that he also doubts the switch over time of <100ms. He estimates a switch over time of >400ms, so I guess this will not match your requirements for this installation, does it? blush

Best regards
J_Bell
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  8/17/2006, 9:52 PM
Late
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kee wrote:
Thanks for the information. But SINAUT, TIM 4V on the S7-400 side and a TIM 3V IE on the S7-300 side, can they still meet the >100ms switching timing which Profibus OLM is able to provides? The SINAUT you are refering is running using GSM? What happen if a critical signal to shed the other side of the plant, Is it fast enough to do so?

When we talk about wireless, common questions will be asked by customer, "how is the security and is it reliable of the communication?" any advise?

Hi Kee,

>100mS is never a problem grin

You didn't mention the <100mS in your first question, you only say that it have to be quick. I don't know how fast it is with radiosignals, the speed of radiosignals is very fast but <100mS is not possible. sad

Radiosignals with radiosets direct on the TIM like a dedicated line don't have the possibility to secure as far i know, on the other side there is no inteference possible because you have to buy a frequency.

But this are all thoughts... blush
I hope that the answer will help, if you have still questions, don't hesitate to ask me.

All the best, Late
Never say never, think in solutions, not in trouble......
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