RE: Connection to Siemens S7 PLC

[Di Maio Franck <Franck.DiMaio@iter.org>]

For ITER, we evaluated two options (but only with S7/300 and S7/400 CPUs): the s7plc device support from SLS that use dedicated Ethernet frames and the native S7 protocol.
For the 2nd option, we used libnodave, the open software lib available for Linux (that is supposed to work with s200). This option is also used at CERN. For windows users, the Siemens libs certainly do the job.
We choose s7plc for performances reasons so we stopped all development on device support with libnodave. 
Native S7 protocols is therefore also an option but I don't think a device support exists.
We can provide a very incomplete example of such a device support if usefull.

Franck

Franck Di Maio
CODAC System Designer
CODAC Section

ITER Organization, Building 519/027, CHD, Control System Division
Route de Vinon sur Verdon - 13115 St Paul Lez Durance - France
Phone: +33 4 42 17 64 05

-----Original Message-----
From: Mark Rivers [mailto:rivers@cars.uchicago.edu] 
Sent: 21 February 2012 16:46
To: Konrad Gajewski; tech-talk@aps.anl.gov
Subject: RE: Connection to Siemens S7 PLC

Can the  MODBUS driver be used with TCP on that family of PLCs?  

Mark

________________________________________
From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Konrad Gajewski [konrad.gajewski@tsl.uu.se]
Sent: Tuesday, February 21, 2012 6:13 AM
To: tech-talk@aps.anl.gov
Subject: Connection to Siemens S7 PLC

Hello everybody,

I'm new to EPICS and I am planning  to control Siemens Simatic S7-200 PLC. I have looked in EPIC documentation and found at least two ways to connect the PLC:

1. via MODBUS (Asyn) driver over the serial connection (using Siemens MODBUS RTU library) 2. using S7plc driver via TCP/IP and a CP 243-1 Ethernet module.

The programming of the PLC is done using Step-7 Micro/WIN V4.0.
Unfortunately I can't open the example STEP 7 PLC project  (for S7plc
driver) in Step-7 Micro/WIN.

Do you have any experience with such a configuration or maybe with S7-1200? Are there any better options?

Thanks,
   Konrad

--
Konrad Gajewski
Senior Research Engineer
Uppsala University                    Tel:    +46-18-4713888
The Svedberg Laboratory               mailto:konrad.gajewski@tsl.uu.se
Box 533, S-751 21 Uppsala, Sweden
http://www.tsl.uu.se/