___________________________________________________________________________________________________
- 39 -
(7) Remote wireless communication in the 3G wireless internet
Using the wireless Internet platform of telecom, all the Ethernet to Serial port modules can be very
convenient to achieve wireless communication, that is to say, you can use the wireless router to
achieve the wireless communication in the LAN, you can also use the 3G router , 3G network
card to achieve the worldwide Internet wireless communication. As long as any places where
the wireless Internet is available,then the wireless communication between the S7-200PLC and
PC, S7-200PLC and PLC can be achieved, which has extended a broader application range.
In fact when you use wireless communication, the setting method is almost as same as the
previous introduction., only 3G router, wireless network card of different manufacturers may have
some differences in the usage, so please read the corresponding product manual. When the
ES-ETH-PPI works as the server, it is best to use the 3G router with the function of dynamic
domain name to connect the ES-ETH-PPI.
User should pay an attention on that the current TD-SCDMA 3G Mobile and China Unicom's
WCDMA 3G network card are using a private network IP address, this can only be used as a client,
can not be accepted as a client server. and Telecom's CDMA2000 EVDO 3G network card is using
a public network IP address, and this can be used as server or client to use.
The following are programs of wireless communication in the Internet wireless network
platform.The both parties of communication can be both 3G wireless network, but also one is 3G
wireless network, the other is the wired Internet.
1.STEP7 Micro/WIN software setting
When 3G etc other wireless network work as the external network communication, STEP7 Micro /
WIN software settings are the same as the introduction of previous(6) -1 article. So please
choose the no parity 10 bit communication mode of "Radio / RF modem "connection.
Of course, the mode switch on the ES-ETH-PPI need to select "10bit".
