Only for eWON types equipped with a MPI port
1 Purpose
This technical note describes how to set up a remote collaboration. A remote collaboration consists in configuring,
programming or monitoring a PLC from a remote location, without the need of connecting directly the PC to the PLC.
A remote collaboration therefore involves a TCP/IP connection and eventually a router, depending on the protocol used
by the PLC.
In this document, we will configure a complete remote collaboration system with a SIEMENS S7300 PLC, the
SIMATIC STEP7 Programmer software and, of course, an eWON as a router. The S7300 uses the MPI protocol.
Three cases of remote collaboration will be treated:
• A direct connection to the eWON by Ethernet.
• A direct connection to the eWON using a phone line. With this topology, the eWON IP address is known since
it is established with your own PC at the PPP connection time.
• A connection to the eWON using Internet and callback. This kind of connection can be used with callback: we
call the eWON and let ring a certain amount of time and we hang up. After a specified amount of time, the
eWON connects to an ISP using its phone line. In this case, the eWON IP address is not known so that the
eWON must publish it’s address, by mail for instance.
The following graph shows the three network topologies.
The direct Ethernet connection will be used to describe the global setup. After this configuration is working, the
changes for the phone and Internet topologies will be described.
In order to follow this technical note, you need:
• An eWON equipped with a MPI port, a PSTN or ISDN modem and a firmware release that supports MPI and
ISOTCP protocols for the S7300 and S7400 PLCs.
• A modem connected to your PC for direct phone connection with the eWON.
• An Internet connection account both for your PC and for the eWON.
• An S7300 (or S7400 PLC) equipped with a MPI port
• A RS485 cable to connect the PLC to the eWON.
• SIMATIC MANAGER STEP 7 -Programmer (in this example V5.3 is used)
In this document, we use Windows XP but any supported operating system can be used. We also assume the reader has
some knowledge of the SIMATIC STEP 7 Programmer software.
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MPI Gateway for SIEMENS
S7300 & S7400 PLCs
TN 29
ver 1_0
2006-06-06
