Re: Siemen's PLC Interfaces

[Rolf Keitel <rolf@triumf.ca>]

Dalesio, Leo `Bob` wrote:
> Is anyone talking to SIemen's PLCs over Profinet from a PC104?
>  
> Or talking to Siemen's PLCs using their ethernet protocol?
>  
> Thanks,
> bob
>
>   
We are talking to a Linde-supplied liquid Helium plant, which is 
controlled by a Siemens S7-400 PLC. We interface to the PLC with a 
Siemens TCP/IP module using the Siemens FETCH/WRITE protocol.
We made minor additions to our Modbus modtcp device/driver support, and 
support both Siemens FETCH/WRITE and Modbus/TCP out of the same 
device/driver support.
Presently we only read the Siemens PLC, but we are in the process of 
implementing write (trivial addition) and probably will have it tested 
by Christmas.

- rolf -

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| Rolf Keitel, TRIUMF         Tel: (604) 222-7453 |
| Group Leader ISAC Controls  Fax: (604) 222-7307 |
| and Electronics Development                     |
| Vancouver, B.C., Canada                         |
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