Profibus Question

kas_ · Sep 25, 2009

Hi. I have made a picture to illustrate my question.
Can I use a reapeter to Y-split a profibus, if not is it posible to Y-split a profibus if so how?

Regards
kas

Jobbe · Sep 25, 2009

Yes, your solution like it is in the picture is possible. Just make sure you enable the terminator resistor on both ends on the red and on the purple line (4 in total).

Paul B · Sep 25, 2009

Late to the chase but it never hurts to have a second opinion. Yes, that will work. I usually position the repeater for best isolation, for example to separate field devices from panel devices. If it makes a Y, then so be it.

kas_ · Sep 26, 2009

Thanks for the response

Is there eny parameters that I must consider?

Paul B · Sep 26, 2009

No, the standard repeater is a passive device. Siemens makes a diagnostic repeater that is present in the hardware configuration but with a standard repeater there is nothing to do.

Consult the repeater manual for info on it's dip switches. I believe Jobbe is correct about four end terminations - one on the repeater itself using its dip switch.

kas_ · Sep 26, 2009

Tnx again

Concerne the end terminations, I`m not following. Does this mean that the end termination should be "On" at the reapeter split for the encoder(4) and the ET200S(6), and at the last encoder(5) and the last ET200S(8) ?

Jobbe · Sep 26, 2009

They should be turned on at the points 1, 5, 6 and 8.

The repeater part on the purple line (point 4) is in the middle of a segment and should have the resistors in the OFF position.

kas_ · Sep 26, 2009

Tnx Jobbe. I will configre it first thing Monday

Profibus Question

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