Beckhoff BK7350 Modbus Bus Coupler

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Manufacturer: BECKHOFF
Product No.: BK7350
Country of origin:Germany
Product Type: Modbus Bus Couplers
Payment: T/T, Western Union
Weight: 100g
Shipping port: Xiamen
Warranty: 12 months

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

Manufacturer	Beckhoff
Part Number/Model	BK7350
Product Type	Modbus Bus Coupler
Number of Bus Terminals	64 (up to 255 with K-bus extension)
Max. Number of Bytes Fieldbus	512 byte input and 512 byte output
Digital Peripheral Signals	1,020 inputs/outputs
Analog Peripheral Signals	256 inputs/outputs
Protocol	Modbus RTU, Modbus ASCII (default: RTU)
Data Transfer Rates	150 baud to 38,400 baud
Bus Interface	D-sub 9-pin, RS485
Data Transfer Medium	Screened, twisted copper cable 2 x 0.25 mm² (RS485)
Power Supply	24 V DC (-15% / +20%)
Input Current	320 mA maximum
Starting Current	2.5 x continuous current
Recommended Fuse	<= 10 A
Current Supply K-bus	1750 mA
Power Contacts	Max. 24 V DC / Max. 10 A
Electrical Isolation	500 V (power contact / supply voltage / fieldbus)
I/O Communication Types	Read/write access, optionally bit-oriented or word-oriented
Operating Temperature	-25 to +60 degC
Storage Temperature	-40 to +85 degC
Relative Humidity	95%, no condensation
Vibration/Shock Resistance	Conforms to EN 60068-2-6 / EN 60068-2-27
EMC Immunity/Emission	Conforms to EN 61000-6-2 / EN 61000-6-4
Protection Rating	IP20
Installation Position	Variable
Weight	Approx. 100 g

Connections and Interfaces

Interface Type	Connection Specification	Function
Bus Connection	9-pin D-sub (female)	RS485 Modbus communication interface
Power Supply Connection	Spring-force terminals	24 V DC system and power contact supply
Internal Bus	K-bus contact strip	Data and power connection to Bus Terminals

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

Key Features:

#Beckhoff Bus Couplers #Modbus Bus Couplers

What is the maximum number of Bus Terminals that can be connected to the BK7350?

The BK7350 supports up to 64 Bus Terminals directly. With a K-bus extension, this capacity can be expanded to support up to 255 Bus Terminals.

Which Modbus protocols are supported by the Beckhoff BK7350?

The BK7350 supports both Modbus RTU and Modbus ASCII protocols, with Modbus RTU configured as the default setting.

How is the station address configured on the BK7350?

The station address can be configured manually using the integrated rotary address switches on the module, or via the KS2000 software tool.

What are the power requirements for the BK7350 Modbus Bus Coupler?

The module requires a 24 V DC (-15% / +20%) power supply with a maximum input current of 320 mA.

Does the BK7350 have hazardous area certifications?

Yes, the BK7350 is certified for hazardous areas with ATEX (II 3 G Ex ec IIC T4 Gc) and IECEx (Ex ec IIC T4 Gc) markings.

Global Express Shipping

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Returns & Warranty

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12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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TECHNICAL SPECIFICATIONS

Country of origin

Beckhoff BK7350 Modbus Bus Coupler