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<== Date ==> <== Thread ==>

Subject: AW: Connection to Siemens S7 PLC
From: Rekow Jens <j.rekow@fmb-berlin.de>
To: tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Date: Fri, 23 Mar 2012 12:12:09 +0100
This topic is a few weeks old already but for your information, sometimes 'All is well that ends well':

Our connection handling problem is solved after some help of the Siemens support. Interfacing with the SLS S7 driver to a Siemens PLC directly connecting to a CPU315-2 PN/DP works fine now.

The problem we had was a timing issue. Most likely the PLC tried to initialize functions to quickly after booting. That made the TCON function got locked sometimes.

HTH,
Jens



> -----Ursprüngliche Nachricht-----
> Von: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-
> bounces@aps.anl.gov] Im Auftrag von Rod Nussbaumer
> Gesendet: Mittwoch, 22. Februar 2012 18:20
> An: Konrad Gajewski
> Cc: tech-talk@aps.anl.gov
> Betreff: Re: Connection to Siemens S7 PLC
> 
> At TRIUMF, we are using our own driver to talk to 400-series Siemens
> PLCs. It uses asyn, and was modeled after Mark Rivers' modbus PLC
> driver. The underlying communications protocol is the Siemens
> FETCH/WRITE protocol over TCP/IP.
> 
> Rod Nussbaumer
> ISAC Controls, TRIUMF
> Vancouver, Canada
> 
> 
> Konrad Gajewski wrote:
> > 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
> >




Replies:
Re: AW: Connection to Siemens S7 PLC Konrad Gajewski
References:
Connection to Siemens S7 PLC Konrad Gajewski
Re: Connection to Siemens S7 PLC Rod Nussbaumer

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