Beckhoff BK7350 Modbus Bus Coupler

Description

Integrating Modbus RTU/ASCII networks with modular I/O systems, the Beckhoff BK7350 bus coupler serves as a reliable interface between the Modbus fieldbus and Beckhoff Bus Terminals. This compact module manages communication for up to 64 Bus Terminals, with expansion capabilities reaching up to 255 terminals using a K-bus extension. The BK7350 automatically configures and maps the connected digital and analog peripheral signals to the Modbus process image, ensuring seamless data exchange in decentralized automation architectures.

The unit features a standard RS485 physical interface via a 9-pin D-sub connector, supporting data transfer rates from 150 baud up to 38,400 baud. Configuration can be executed directly using the integrated rotary address switches or via the KS2000 software tool. Designed for harsh industrial environments, the module features robust electrical isolation between the power contacts, supply voltage, and the fieldbus network.

Features

• Supports Modbus RTU and Modbus ASCII protocols with RTU as the default configuration.
• Connects up to 64 Bus Terminals directly, expandable to 255 terminals via K-bus extension.
• Provides up to 512 bytes of input data and 512 bytes of output data capacity.
• Configurable addressing and parameters via physical rotary switches or KS2000 software.
• Integrated RS485 interface utilizing a standard 9-pin D-sub connection.
• Electrical isolation of 500 V between power contacts, supply voltage, and fieldbus.

Applications

• Industrial manufacturing and assembly line automation.
• Process control systems in water and wastewater treatment facilities.
• Building automation and HVAC control networks.
• Remote telemetry and distributed I/O data acquisition.

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Mounting: Mount the module on a standard 35 mm DIN rail (EN 60715) in a clean, dry control cabinet.
• Wiring: Use screened, twisted-pair copper cabling (2 x 0.25 mm²) for the RS485 fieldbus line to prevent electromagnetic interference.
• Grounding: Ensure the DIN rail is properly grounded to the functional earth (FE) of the control cabinet.
• Ventilation: Maintain adequate clearance above and below the module to allow natural convection cooling. Do not block the ventilation slots.

Compliance and Certifications

• CE
• UL
• ATEX: II 3 G Ex ec IIC T4 Gc
• IECEx: Ex ec IIC T4 Gc