WebLog 120

M-Bus Datalogger for 120 devices with a webserver

Relay WebLog120 Master
  • M-Bus logger for 120 meters
  • Integrated web server allows complete operation via web browser
  • USB, Ethernet, W-LAN, RS232C, RS485, repeaters
  • Data export as XML, XLS, CSV via email, FTP, USB or download
  • Firmware update via web browser
  • Compact dimensions and top-hat rail mounting
  • Automatic, monthly export of meter readings per tenant possible (EED)
  • Repeater input enables dual operation with a second M-Bus master

Compact M-Bus intelligence

The little sister of the WebLog250 now brings the full convenience and performance also to smaller installations. The M-Bus logger WebLog120 has an integrated web server, 4GB memory and adapts to your needs as flexibly as the WebLog250. The WebLog120 can supply M-Bus 120 meters with power and voltage and manage up to 1,000 meters. With the help of the implemented database, your data can already be structured individually in the central unit.

A particularly convenient function is the automatic export of the read data via email or FTP upload. In addition to the standard interfaces (USB, RS232C, Ethernet, RS485, repeater), WiFi is also available as an option. Thanks to the integrated double LAN interface and the repeater input, very individual installations can be realized, for example with a second controller or with a second M-Bus master.


Remote access to the WebLog120 is done via a web browser. Up to 120 terminals can be managed.

Technical Data

Operating voltage110 .. 250VAC, 47 .. 63 Hz
Power consumptionmax. 60W
Temparature range0 .. 45°C
M-Bus voltage (without load)36V
M-Bus standby currentmax. 180mA
Bus impedanceca. 8 Ω
Overcurrent threshold250mA
M-Bus baud rate300 bis 38400 Baud
Galvanic isolationavailable
Housinglight grey and black ABS plastic, protection class IP 30, mounting on DIN rail, H x W x D: 140 x 90 x 60 mm
LED status indicatorspower, communication, maximum load M-Bus, M-Bus short circuit , M-Bus active, ERROR
Interfaces2x 10/100 MBit Ethernet, USB-Host, USB-Device, RS232, Repeater, MicroSD, 2x USB-A
optional: W-LAN, RS485
Terminals3 x terminals for M-Bus, plug-in terminals for floating contacts and relay outputs