Wago 750-643 MP-Bus master module

Why Choose the WAGO 750-643 MP-Bus Master Module?

The WAGO 750-643 is a specialised MP-Bus master communication module designed for integration within the WAGO I/O System 750. It enables PLC and controller systems to connect directly to MP-Bus devices such as HVAC actuators and sensors used in building automation and environmental control systems.

The module acts as the master for the Belimo MP-Bus (Multi-Point Bus), allowing MP-Bus networks to be integrated into higher-level automation systems such as Ethernet-based or fieldbus control platforms. This allows centralised monitoring and control of HVAC components including dampers, valve actuators and variable air volume (VAV) systems. :contentReference

A single MP-Bus line can connect multiple actuators and sensors, significantly reducing wiring complexity while maintaining reliable communication between field devices and the control system.

Key Advantages

• Integrated MP-Bus master interface for HVAC automation.
• Connects Belimo MP-Bus actuators and sensors directly to PLC systems.
• Supports up to 8 MP-Bus slave devices on one bus line.
• Allows connection of one sensor per actuator.
• Reduces wiring complexity in building automation installations.
• Compact DIN rail module for WAGO I/O System 750.

Key Features

• MP-Bus master communication module.
• Supports Belimo MP-Bus protocol.
• Controls and monitors up to 8 MP-Bus slaves.
• Supports actuator sensors such as temperature, humidity and switching signals.
• Provides connection to higher-level control systems via the WAGO fieldbus controller.
• Parameterisation possible using Belimo handheld or PC configuration tools.
• Compact DIN rail installation with CAGE CLAMP® spring terminals.

Technical Specifications

• Manufacturer: WAGO
• Series: I/O System 750
• Model: 750-643
• Module type: MP-Bus master communication module
• Bus protocol: Belimo MP-Bus (PP/MP specification)
• Maximum slaves: 8 MP-Bus devices
• Sensor support: 1 sensor per actuator
• MP-Bus supply voltage: 24 V DC
• System supply voltage: 5 V DC via internal system bus
• Current consumption: approx. 25 mA (MP-Bus)
• Isolation: approx. 500 V between MP-Bus and system bus
• Connection technology: WAGO CAGE CLAMP®
• Mounting: DIN-35 rail
• Protection rating: IP20
• Operating temperature: 0 to 55 °C
• Module width: approx. 12 mm

MP-Bus Communication in Building Automation

The MP-Bus protocol is widely used in HVAC and building automation systems to connect actuators, sensors and controllers on a single communication line. Using a master-slave architecture, devices such as damper actuators, valve regulators and ventilation controllers can communicate with a central control system.

The WAGO 750-643 module enables these MP-Bus devices to be integrated directly into distributed PLC architectures, allowing building automation systems to be managed alongside industrial control processes within a single control platform. :contentReference

Typical Applications

• HVAC control systems in commercial buildings.
• Integration of Belimo MP-Bus actuators.
• Variable air volume (VAV) control systems.
• Automated ventilation and damper control.
• Building energy management and environmental monitoring.

Trusted by Building Automation Engineers

WAGO I/O System 750 modules are widely used in industrial and building automation projects to integrate HVAC devices, sensors and control systems within scalable PLC architectures.