MODEM MD720 (for S7-200/300 and ET 200S)

• GSM/GPRS mobile radio modem MD720 with RS 232 interface for IP-based communication in industrial applications
• DIN rail mounting
• 24 V DC power supply
• Supports the GSM services CSD ¹⁾, SMS and GPRS
• Use with Telecontrol Basic:
  Data transmission over tunneled GPRS connection with SIMATIC S7
• Use with SINAUT ST7:
  Data transmission via CSD, GPRS, transmission of text messages
• AT command interface: For remote maintenance or sending text messages

¹⁾ CSD – Circuit Switched Data (data transmission via GSM dial-up connection)

• Can be used worldwide due to quad band technology (observe national regulations)
• Quick assembly due to standard rail mounting

For GPRS operation in combination with TeleControl Server Basic:

• Low operating costs for a permanent wireless online connection due to optimized communication with efficient message format
• The location of the central control station is irrelevant due to the Internet connection between the mobile phone provider and the OPC (UA) server (TeleControl Server Basic)
• Secure connection over public networks through encrypted data transmission plus additional measures of the GPRS provider
• Simple configuration of wireless connected plants without specialist radio knowledge
• Modem replacement is possible by non-specialists since parameterization is carried out through the S7-200
• Cost savings thanks to remote servicing and remote programming
• Various different example applications are available in Customer Service under the heading "Application & Tools" to enable applications to be created quickly using combinations of perfectly interacting automation components. (http://support.automation.siemens.com/WW/view/en/34677186/136000)

• GSM modem for the SINAUT ST7 telecontrol system for data transmission via dialup connection (CSD service)
• GSM modem for the TeleControl Basic system for data transmission via GPRS
• Construction of systems for monitoring and controlling of simple telecontrol stations
• Energy-saving concepts for plants, e.g. by means of status-dependent speed control of pumps in remote stations
• Control and monitoring of, for example:
  • Sewage treatment plants, water treatment
  • Oil and gas supplies
  • District heating networks
  • Power distribution
  • Pumping stations
  • Automatic machines
  • Traffic control systems
  • Buildings
  • Intelligent advertising panels
  • Weather stations
  • Lighthouses and buoys
  • Wind energy and photovoltaic plants
• Linking of mobile stations, with central monitoring/control of track vehicles, special vehicles, local public transport, complex building machines, ships on rivers and in coastal areas
• Remote programming and maintenance of the SIMATIC S7-200 via a GSM dialup connection (CSD service)

GPRS communication between SIMATIC S7-200 with MODEM MD720 and TeleControl Server Basic

• Rugged plastic enclosure for DIN rail mounting
• 9-pin Sub-D socket with RS232 interface (PPI adapter for SIMATIC S7-200 necessary)
• Diagnostics LEDs for modem status, field strength and connection check
• SET service key
• 4-pin screw terminal for connection to the 24 V DC supply voltage
• SMA connection for GSM/GPRS antennas

• Quad-band GSM with the frequency bands 850/900/1800/1900 MHz
• GPRS Multislot Class 10 (gross: Max. 42 Kbps upload, max. 54 Kbps download).
• Automatic establishment and holding of IP-based online connection over GPRS to the internet
• Data exchange with PC-based TeleControl Server Basic (router and OPC (UA) server) application; data exchange with further MD720 modems possible over routing of TeleControl Server Basic
• Hot switchover between GPRS and CSD (modem operation)
• CSD and GPRS connection controllable using AT commands
• Sending of SMS and fax (via SMS) using GSM services
• Remote programming of S7-200 with MicroWin in GSM modem mode (CSD mode)
• Secure access to SIMATIC S7-200 data, also over mobile radio provider networks which do not provide public and fixed IP addresses for the modem

Configuration

• Parameterization using PLC blocks with the Micro/Win programming tool for SIMATIC S7-200
• PLC blocks are part of TeleControl Server Basic
• AT command interface

Security

• Approval of up to 3 call numbers for incoming GSM connections (CLIP function) for teleservice
• User name and password for GSM connection
• Unlimited client and server operation even in protected GPRS networks with private IP addresses of the mobile radio providers
• Secure data transfer in GPRS mode between modem, the internet, and TeleControl Server Basic using encryption algorithms

Diagnostics / maintenance

• Status of establishment of connection, and of an existing connection on front LED display
• Reading of configuration data over the RS232 interface
• Connection status to modem and to PLC can be monitored in Telecontrol Basic
• Direct, additional access over GSM (modem operation) for teleservice (remote programming, remote diagnostics)

Wireless approvals:

Current approvals can be found on the Internet at:
http://www.siemens.com/mobilenetwork-approvals