BECKHOFF C9900-E781 Push-Button Extension

Description

Engineered as a robust hardware expansion, the Beckhoff C9900-E781 push-button extension provides direct tactile operator controls for CP6xxx and CP7xxx Series Control Panels and Panel PCs. This module is specifically optimized for integration below 15-inch displays without integrated keyboards, enhancing operator interface efficiency in demanding industrial environments.

The unit features 16 square push-button keys equipped with individual signal lamps, allowing clear status feedback for machine functions. For safety-critical operations, a dedicated emergency stop key is integrated directly into the faceplate. Communication and control of the push-buttons and indicator lights are managed over a high-speed USB interface, while auxiliary terminal rows allow for direct hardwiring of critical signals to ensure system-wide redundancy and safety compliance.

Features

• Tactile Control Elements: Equipped with 16 square push-button keys (30 x 30 mm, Siemens Signum type) featuring integrated signal lamps and customizable insert labels for individual marking.
• Integrated Safety: Features a single, highly visible Siemens Signum emergency stop key designed for direct external wiring.
• Dual Connection Path: All 16 push-buttons are transmitted over USB via a normally-open (NO) contact, and also feature a second NO contact routed directly to an integrated terminal row for optional hardwired control.
• USB Control: Indicator lamps and the onboard Gray code switch are controlled exclusively via the USB interface.
• Onboard Selection Switch: Includes one 23-position Gray code switch for machine mode selection or parameter adjustment.
• External Connectivity: Front-mounted 2-port USB Type-A interface sealed with an IP65 screw cap for direct maintenance access.

Applications

• CNC machine tools and machining centers
• Automated assembly and production lines
• Heavy industrial control workstations using Beckhoff CP6xxx and CP7xxx panels
• Process control systems requiring physical emergency stops and mode selectors

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Mechanical Mounting: Secure the push-button extension directly to the bottom of the compatible 15-inch Beckhoff Control Panel using the standard mounting brackets and screws. Ensure gaskets are seated properly to maintain the rated ingress protection.
• Grounding: Connect the functional earth terminal of the push-button housing directly to the central low-impedance grounding point of the control cabinet.
• Wiring Safety: Route the emergency stop wiring separate from high-voltage AC cables to minimize electromagnetic interference. Direct-wire the E-stop to an approved safety evaluation relay or safety PLC input.
• USB Cable Routing: Ensure the internal USB control cable is routed without sharp bends and away from moving components or heat sources.