Siemens SIMATIC NET System Manual page 257

Functions
The MD720 modem has the following functions:
● Quadband GSM (850/900/1800/1900 MHz)
● GPRS multislot class 10 (gross: 13.4-27 kbps upload, 40-54 kbps download).
● Automatic establishment and keeping up of the IP-based online connection via GPRS to
the Internet
● IP-based data exchange with the PC-based application TeleControl Server Basic (router
and OPC server)
● Data exchange with other MD720 modems via the routing of TeleControl Server Basic
● Changeover between GPRS and CSD (modem operation) during operation
● CSD and GPRS connection controllable using AT commands
● Sending of SMS messages and fax (via SMS) using GSM services
● Secure access to data of the S7-200 also via mobile wireless provider networks that do
not provide public and fixed IP addresses for the modem.
Project engineering
● Parameter assignment via SPS blocks with the programming tool Micro/Win for S7-200
(blocks part of TeleControl Server Basic)
● AT command interface
Security
● Release of up to 3 call numbers for incoming GSM connection (CLIP function) for
teleservice
● Username and password for GSM connection
● Unrestricted client and server operation also in protected GPRS networks with private
addresses of the mobile wireless provider.
● Encrypted data traffic between modem, Internet and SINAUT MICRO SC
Diagnostics / maintenance
● Status of connection establishment and an existing connection displayed by front panel
LEDs
● Reading out configuration data via the RS-232 interface
● Connection status to the modem and PLC monitorable in TeleControl Server Basic
● Direct additional access via GSM (modem operation) for teleservice (remote
programming, remote diagnostics)
Industrial Ethernet
System Manual, 09/2019, C79000-G8976-C242-10
SCALANCE network components
4.7 SCALANCE M industry router
257