WirenBoard — Open Industrial DIN-Rail Controller

What is WirenBoard?

WirenBoard is a Russian company (Moscow, founded 2010) that manufactures Linux-based DIN-rail automation controllers and I/O modules. The WB-7 (current generation) is a powerful embedded Linux computer in a 4-module DIN package — it runs Debian, a built-in MQTT broker (Mosquitto), a wb-rules JavaScript automation engine, and provides Modbus RTU/TCP and RS-485 interfaces.

WirenBoard's strength: very flexible, affordable, open-source firmware, and a growing ecosystem of I/O expansion modules for any sensor or actuator type. It's popular as a sub-system controller in heating, HVAC, and energy metering applications — often alongside KNX.

WB-7 controller specification

WirenBoard I/O expansion modules

wb-rules — JavaScript automation engine

wb-rules is WirenBoard's built-in automation scripting engine. Rules are written in JavaScript (ECMAScript 5.1) and have access to all MQTT topics. You can create complex time-based, event-based, or condition-based automations directly on the controller — no cloud, no external server.

defineRule("heating_control", {
  whenChanged: "/devices/wb-ms/controls/temperature",
  then: function(newValue, devName, cellName) {
    var temp = parseFloat(newValue);
    if (temp < 20.0) {
      dev["wb-mr6c/K1"] = true;   // relay on = valve open
    } else if (temp > 22.0) {
      dev["wb-mr6c/K1"] = false;  // relay off = valve closed
    }
  }
});

WirenBoard vs KNX — when to use which