BECKHOFF C9900-E878 Control Panel Accessory Push-button Extension

Description

Designed to expand physical operator control capabilities on Beckhoff human-machine interfaces, the C9900-E878 push-button extension provides integrated tactile inputs directly adjacent to the industrial display. This extension module is engineered for mounting on the right-hand side of CP6x32-00xx and CP7x32-00xx Control Panels and Panel PCs featuring a 15-inch display configuration without an integrated keyboard.

The unit combines digital integration with traditional hardwired fail-safe pathways. It houses 18 individual push-button keys outfitted with integrated signal lamps (Siemens Signum square, 30 x 30 mm layout) and a dedicated Siemens Signum emergency stop key. Signal transmission is handled flexibly: primary button operations and all signal lamp controls are transmitted over CP-Link or USB. For safety-critical integrations and independent control loops, each push-button provides a second normally-open contact routed directly to an onboard terminal row for local hardwiring.

Features

• Specifically designed for right-side mounting on Beckhoff CP6x32-00xx and CP7x32-00xx 15-inch displays.
• Equipped with 18 Siemens Signum square (30 x 30 mm) push-buttons with built-in signal lamps.
• Integrated Siemens Signum emergency stop switch, designed for direct external hardwiring.
• Customizable label inserts under push-button caps to allow application-specific marking of control functions.
• Dual-channel connection capability: digital transmission via CP-Link/USB alongside a local terminal row for direct wiring of secondary normally-open contacts.
• Signal lamps operate exclusively through digital communication channels via the CP-Link or USB interface.

Applications

• Operator panels on automotive assembly lines.
• Machine-level HMI control stations in packaging and materials handling.
• Process control desks requiring physical emergency stop and manual cycle start/stop overrides.
• Specialty machinery where software touchscreens are complemented by tactile operator controls.

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Mounting: Mechanically align and secure the extension unit to the right-hand chassis mounting points of the compatible 15-inch control panel. Ensure gaskets are seated correctly to maintain ingress protection ratings.
• Wiring Safety: Route the emergency stop circuit separately from communication cables to prevent electromagnetic interference and comply with safety loop regulatory standards.
• Grounding: Ensure the control panel chassis is properly grounded to the machine frame to provide effective shielding for the CP-Link/USB communication lines.