BECKHOFF KL6041 RS422/RS485 Serial Interface Bus Terminal

Description

The BECKHOFF KL6041 is a high-performance serial interface Bus Terminal designed to connect devices equipped with RS422 or RS485 interfaces directly to K-bus-based automation networks. Acting as an intelligent gateway, the terminal enables the system to transmit and receive serial data streams independently of the underlying fieldbus protocol. This direct integration ensures reliable data exchange with various peripheral devices, such as barcode scanners, serial displays, operating terminals, and specialized sensors.

The terminal operates as an active communication module that handles the physical data transmission using differential signaling. It contains dedicated internal memory buffers to prevent data loss during periods of high bus traffic. By decoupling the serial communication cycle from the fieldbus task cycle, the BECKHOFF KL6041 ensures steady, precise data transmission, which is further aided by integrated galvanic isolation that protects the internal K-bus electronics from field-side interference.

Features

• Dual-interface compatibility supporting both RS422 and RS485 serial communication.
• Full-duplex and half-duplex data transfer modes.
• Differential signal transmission to minimize electromagnetic interference.
• Integrated line impedance of 120 ohms for matching standard communication cables.
• Onboard data buffers, containing a 1024-byte receive buffer and a 128-byte transmit buffer.
• Galvanic isolation rated at 500 V between the internal K-bus and the field signal lines.
• Variable process image width up to 22 bytes of user data.
• Direct power supply via the K-bus, eliminating the need for external power contacts.

Applications

• Integration of legacy serial devices including barcode scanners, scales, and label printers.
• Point-to-point RS422/RS485 serial communication links over long distances up to approximately 1000 meters.
• Connection of operator interface panels and industrial serial displays.
• Interfacing with proprietary serial controllers and third-party instrumentation.

Technical Specifications

General

Electrical and Buffer Specifications

Mechanical and Environmental

Compliance and Certifications

Installation Guidelines

1. Ensure the system is completely de-energized and all power supplies are switched off before proceeding with installation.
2. Verify that the model number matches KL6041 and inspect the terminal housing for visual signs of shipping damage.
3. Mount the terminal onto a standard 35 mm DIN rail by snapping it into place, ensuring the interlocking side grooves align correctly with the neighboring terminals.
4. Ensure secure mechanical locking and proper K-bus contact connection with adjacent terminals on the rail.
5. Connect the RS422 or RS485 serial signals to the terminal points using twisted-pair communication cabling. Ensure proper termination using the internal 120-ohm impedance if required by the network topology.
6. Ground any cable shields appropriately to prevent electrical noise and signal degradation.
7. Re-energize the K-bus system and configure the serial communication parameters (baud rate, parity, stop bits) using TwinCAT or your standard controller configuration software.

Replacement Recommendations

When replacing an existing BECKHOFF KL6041, first isolate the power supply to the entire station. Note and document the terminal configuration and physical wiring connections before removing the faulty unit. The replacement unit does not require any hardware address settings, as configuration parameters are written automatically by the Bus Coupler or controller during initialization.