Hi gents,
How r u all.We are working on a project in interfacing remote PLC through telecommunications. The process outlined below and it would be highly appreciable and helpful your suggestions.

Process : It is a water treatment plant. The treated water goes to reserviour and from there pumped for various applications. So we have got 12 pumping stations and reserviours. Each station installed with Momentum PLC and it works in automode locally. Now our project is to interface all these 12 stations to the central water treatment plant to monitor and control through SCADA system.

Previously our telecom people installed copper wires and analog modem to interface these PLCs,but this was not successful. So then we planned to get through TCP/IP network which momentum modules also support. Also the telecom told they can provide this through MPLS solution, but unfortunately this is also giving problem.

Have any of you gents done this project before or any suggestions in this would be highly helpful coz too much money spending on this with no result.

Any questions and clarifications plz let me know.Looking forward for replies. Have fun.

Regards
Pravin

 

Yes we did such thing for one dam project in karnatak, india. Contact to pathan [at] godrej [dot] com for details.

 

Yes, that is what we are doing regularly. In most cases we use Modbus TCP for data acquisition. But other protocols are also possible.

We use our open source project
http://pvbrowser.org

The principle of data acquisition we use is:
Run a daemon that talks the protocol of your field devices and cyclically read those values and store then into a shared memory within the computer. The daemon also provides a mailbox for sending outputs to the field devices.
See:
http://pvbrowser.de/pvbrowser/pic/prinzip.png

Then we have a "Process View Server" on that computer that has access to the shared memory and the mailbox. This Server is waiting on the network for clients to connect. Any number of clients from the LAN or internet can connect to this server.

This can be compared to a web browser. But we use dynamic Qt widgets instead of HTML. You can surf any number of visualizations within the network using hyperlinks. This was especially optimized for HMI/SCADA.

PS: The software runs on UNIX/Linux, windows and OS-x. The server can run on OpenVMS also.