BECKHOFF KL4438 Bus Terminal

Description

The BECKHOFF KL4438 is an 8-channel analog output terminal designed for the modular K-bus I/O system. It converts digital 16-bit values from the controller into physical voltage signals ranging from -10 V to +10 V. The terminal incorporates single-ended signal technology with a common ground connection, optimizing space to provide eight separate outputs within a standard 12 mm housing width.

Operating as an interface between the automation network and variable-voltage field actuators, the BECKHOFF KL4438 provides high-density analog control. The electronic circuitry is electrically isolated from the system bus to protect control components from voltage transients and field-side electrical interference. Active channel status and diagnostics are managed via the bus coupler to ensure reliable integration into the control environment.

Features

• Eight analog output channels integrated into a compact 12 mm housing
• Signal range of -10 V to +10 V with 12-bit conversion resolution
• Single-ended output configuration utilizing a common ground terminal point
• Short-circuit proof analog outputs with load protection
• Electrical isolation of 500 V between the K-bus and the output signal lines
• Automatic addressing and system configuration with no manual switch settings required
• Compact DIN rail mounting with spring-loaded connection terminals

Applications

• Voltage-based setpoint control for frequency converters and servo drives
• Control of proportional valves and physical positioning systems
• Analog input control on legacy variable-speed machinery
• Integration in multi-point testing systems requiring adjustable reference signals

Technical Specifications

Installation Guidelines

1. Ensure the entire industrial control cabinet is completely de-energized before mounting, removing, or wiring any module.
2. Inspect the BECKHOFF KL4438 housing and contact pins for physical integrity prior to mounting.
3. Snap the terminal securely onto a standard 35 mm DIN rail (EN 60715) alongside the system bus coupler and other compatible terminals.
4. Verify that the K-bus contact surfaces engage fully with the adjacent modules to establish continuous communication and power.
5. Connect the signal outputs and reference ground potentials to the terminal points using solid wire or ferruled flexible conductors.
6. Power the system and use the twin control system configuration interface to scan, address, and verify the I/O signal mappings.