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| 8/18/2008 3:02 PM | |
Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating:
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Hello, There are two major families of solutions to reach a PLC remotely. 1) Teleservice is based upon TS Adapters at the remote site (PLC side). The TS adapter is a king of gateway between PSTN or ISDN and a local network (MPI/Profibus or Ethernet, depending on the PLC network). The PC at the maintenance site calls remote site (via a phone number)by means of a Teleservice software + a modem in the PC (analog or ISDN). 2) Remote access based upon TCP/IP networks. With a broadband card (edge/UMTS), you get an Internet connection (temporary IP address). The remote site is also connected to Internet (via a DSL connection for instance + router). The PLCs are connected to Ethernet at the remote loacation. Between the PC and the remote location the most secureway (you run over Internet!!) is to establisch a VPN tunnel. The PC is equipped with a VPN Software client, and the remote site a VPN gateway is installed (Scalance S612 for instance). When using the S612, the remote site has a fixed IP address on Internet. Boradband mobile solutionsmust beanalysed more in detail case by case, because the different mobile operators have each their specifics(country regulations, costs accounting, allocation of IP address,Nating, ...). There is a lot of information here: http://support.automation.siemens.com/WW/view/en/26662448 |
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Best regards |
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