The Siemens 6NH9720-3AA00 (MD720-3) is a Quadband GSM/GPRS modem designed for industrial telecontrol. It enables wireless remote access for S7 PLCs via RS-232, featuring 24V DC operation and DIN rail mounting.
The Siemens 6NH9720-3AA00, also known as the SINAUT MD720-3, functions as a robust industrial GSM/GPRS modem. It provides a reliable wireless bridge that connects remote automation systems to central control hubs. By utilizing cellular networks, this device empowers PLCs and industrial controllers to transmit critical data over long distances without the need for physical cabling.
To ensure easy integration, Siemens equips the MD720-3 with a standard RS-232 interface. This allows the modem to communicate efficiently with a wide variety of industrial hardware through standard AT commands. Furthermore, the modem frequently serves the Siemens S7-200 and S7-1200 ecosystems, providing engineers with secure remote access for troubleshooting and monitoring. To enhance signal reliability, the unit features an SMA female socket, which allows users to mount an external antenna outside of metal control cabinets.
Beyond its communication capabilities, the 6NH9720-3AA00 features a rugged IP40-rated housing designed for the factory floor. The chassis clips directly onto a standard 35mm DIN rail, simplifying the installation process. Additionally, the modem maintains stable operation in extreme temperatures ranging from -20°C to +60°C. Because it accepts a wide 12V to 30V DC power supply, it integrates perfectly into standard 24V industrial power distribution networks.
Continuous GPRS Monitoring: The modem maintains an “always-on” connection to ensure real-time data flow and automatic reconnection after power cycles.
Dual-Way SMS Messaging: Users can configure the device to send alarm notifications or receive remote control triggers via standard text messages.
Legacy CSD Capability: It supports transparent data channels at 9600 bit/s, effectively emulating a traditional dial-up telephone line for older systems.
Optimized S7-200 Integration: The package includes a gender changer that facilitates a direct connection to RS-232/PPI adapters.
Instant Visual Diagnostics: Front-panel LEDs provide immediate feedback on signal strength, power status, and active connections.
Manufacturer: Siemens
Product Series: SINAUT MD720-3
Network Standards: GSM / GPRS (Quadband 850/900/1800/1900 MHz)
Data Interface: 9-pin Sub-D (RS-232)
Antenna Port: 50 Ohm SMA Female
Power Requirements: 24V DC (Standard), 12-30V DC (Range)
Power Usage: Approximately 5W
Mounting Type: 35mm DIN Rail
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