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Sinec L2 Busterminal

Thread Starter: shaun   Started: 2/28/2010 8:14 AM   Replies: 3

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  2/28/2010, 8:14 AM
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Hello All,

Does anyone have any experience with the Sinec L2 PG/OP Busterminal RS485 (6GK1 500-0DA00)
I have a pair on my plant (which is a new plant) that connect an S7-400 CPU MPI port to a Siemens Touch Panel elsewhere in the field.
As I understand it, this is quite an technology device, so I am tryin gto understand why it would be used in a new, state of the art process? Maybe just as a cheap repeater?

In any case, I want to be able to connect my laptop to the 9-pin D-sub connector on this bustermianl so that I can interrogate the PLC but the MPI adapter does not get any power from the device. I believe there is no 24v supply from the panel to the relevant pins, so any ideas how how I can ccomplish this?

Many thanks,
Shaun Nel.
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  2/28/2010, 6:00 PM
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Dear Shaun,

It is only a possibility to get a good connection to the MPI or PROIBUS.

It is depending if this 24V is coming to the Sub-D connector if the connected device have on the right pin 24V.

Which display are you using ?

Look in the networkbook SIMATIC NET PROFIBUS Networks for further information on which pin the 24V is normally. Chapter 4.7 and further give more information about the busterminal. On page 5-4 the layout of the connector is showed (Pin 2 Massa 24V and Pin 7 +24V). You can make a Sub-D connector which is connecting to the Pins 3 and 8 and which is only have on Pin 2 and 7 a external 24V power supply. Take care that the 24V is fused and that it won't come on the other Pins, you may damage the equipment... Rnf:lblSmileyTooltip_  think

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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  3/1/2010, 6:11 AM
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Thanks for that info Late. However, I think I may have made a mistake when I said I wanted 24v on the plug. Please disregard that statement.

What I would like to do is connect my laptop with Step7 on it to the 9 pin plug on the busterminal nd connect via MPI to the PLC. When I plug the MPI adapter to this busterminal, none of the LED's on the busterminal illuminate and I get no communication.

Is it possible to connect to the PLC vias MPI in this way?
If so and I do not get any comms via MPI adapter, is there something I am doing incorrectly?

Thanks,
Shaun.
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  3/1/2010, 8:06 AM
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shaun wrote:
.... When I plug the MPI adapter to this busterminal, none of the LED's on the busterminal illuminate and I get no communication.

Hello shaun

can you please check if you have the power LED on the your MPI Adaptor lit?
As Late already said, the "normal" USB MPI/DP PC adaptor needs 24V from the MPI/DP port to which it is connected (Pin7: +24V, Pin 2 0V. I can't remember if the older RS232 version needed it too).
The busterminal does however NOT provide these 24V to Pin 7&2 which may very well be your problem.

If you have a Field PG, CP5511 or 12 PCMCIA cards handy you could also test it first with these (they do NOT need the 24V supply from Pin 7&2).
Btw, you can also order a seperate 24V external power supply adaptor for the USB MPI/DP Adaptor (part number and link 6ES7972-0CA00-0XA0)

shaun wrote:
Is it possible to connect to the PLC vias MPI in this way?

Providing you get 24V power to your MPI Adaptor I think it will work (MPI is a subset of Profibus and I don't think that the busterminal will "block" it. I have however never tested this one).

I hope this helps

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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