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Bart
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 Posted: Sat Nov 15, 2003 9:00 am Post subject: Newbie question |
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Hi all,
I have a Siemens S7 PLC which is connected to a PC. There are programs
(SCADA) that are able to read data out of the PLC over TCP/IP. Now I want to
create a program that is also able to read data from and write data into my
PLC.
The problem here is that a cannot find any documentation about the protocol
that Siemens is using. So I woould like to now if it is possible to 'listen'
to the existing connection and see what data is send to and read from the
PLC.
The only thing I found out is that they use probably port 2000 and 2001 ?
Can any one put me in the right direction to accomplish. Thanks a lot in
advance,
Bart JAnisse
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Simon Devlin
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| Posted: Sat Nov 15, 2003 3:31 pm Post subject: Re: Newbie question |
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Get yourself a copy of WinPCAP and install it. Then use Ethereal.
The first is a packet capture library, the second an open source protocol
analyser. That will be a start.... Good luck!
"Bart" <@> wrote
| Quote: |
The problem here is that a cannot find any documentation about the
protocol
that Siemens is using. So I woould like to now if it is possible to
'listen'
to the existing connection and see what data is send to and read from the
PLC.
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| Back to top |
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Martin James
Guest
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| Posted: Sat Nov 15, 2003 4:49 pm Post subject: Re: Newbie question |
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| Quote: |
The problem here is that a cannot find any documentation about the
protocol
that Siemens is using. So I woould like to now if it is possible to
'listen'
to the existing connection and see what data is send to and read from the
PLC.
The only thing I found out is that they use probably port 2000 and 2001 ?
|
Perhaps you've already tried it, but, if not, what happens if you telnet to
these ports? Sometimes, even with embedded processors, there is a
test-based interface, sometimes with 'help'.
Probably, it's some dedicated protocol that is not human-readable, but
sometimes you get lucky.
Rgds,
Martin
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Martin James
Guest
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| Posted: Sat Nov 15, 2003 6:40 pm Post subject: Re: Newbie question |
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| Quote: | test-based interface, sometimes with 'help'.
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Typo - I meant, of course, 'text-based interface'.
Rgds,
Martin
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Wilker
Guest
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| Posted: Mon Nov 17, 2003 5:09 pm Post subject: Re: Newbie question |
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it is the best solution, install this sniffer, and put it to "watch" what is
going on in a transmittions between two hosts (PC and PLC)...
you can use some filters , by ports or protocols...
see ya.
Wilker.
"Simon Devlin" <simon.devlin> escreveu na mensagem
news:3fb64732$1 (AT) newsgroups (DOT) borland.com...
| Quote: | Get yourself a copy of WinPCAP and install it. Then use Ethereal.
The first is a packet capture library, the second an open source protocol
analyser. That will be a start.... Good luck!
"Bart" <@> wrote
The problem here is that a cannot find any documentation about the
protocol
that Siemens is using. So I woould like to now if it is possible to
'listen'
to the existing connection and see what data is send to and read from
the
PLC.
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| Back to top |
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Bart
Guest
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| Posted: Mon Nov 17, 2003 9:11 pm Post subject: Re: Newbie question |
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Okay I will do that.
Thanks for the response
Regards,
Bart Janisse
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