Beckhoff C9900-E855 Control Panel Series Push-Button Extension

Description

Integrating physical control elements directly alongside industrial displays, the Beckhoff C9900-E855 push-button extension expands operator interface capabilities on CP6xxx and CP7xxx Control Panels and Panel PCs. Designed specifically for 15-inch display models without integrated keyboards, this robust hardware add-on mounts on the right-hand side of the display housing, streamlining manual operations and emergency stop interventions. The assembly is currently in its service phase, making it a critical spare part for maintaining legacy HMI systems.

Features

• Ergonomic Layout: Designed for right-side mounting on 15-inch displays, providing natural auxiliary control accessibility.
• Tactile Key Elements: Equipped with 16 square Siemens Signum push-buttons (30 x 30 mm) featuring integrated signal lamps for visual feedback.
• Safety Integration: Features one high-visibility Siemens Signum emergency stop switch, directly wireable to dedicated safety relays.
• Dual Connection Path: All primary push-button operations transmit digitally via CP-Link or USB using a normally-open (NO) contact, while secondary NO contacts are routed to an independent terminal row for hardware bypass.
• Customizable Legend: Slotted design allows for quick installation of slide-in labels beneath push-button caps for individual key identification.

Applications

• Automotive assembly lines and machining cells using Beckhoff CP6x12 or CP7x12 HMIs.
• Process control workstations requiring a combination of touchscreen inputs and physical override switches.
• Legacy machine retrofits where direct physical E-stop integration is mandatory.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

This unit is specifically dimensioned for legacy 15-inch housings without keyboards (CP6x12 and CP7x12). When upgrading or replacing older control hardware, verify the exact suffix code of your Control Panel; attempting to pair this module with 12-inch or 19-inch variants will cause physical layout mismatch and mounting failure.

Application Pitfalls & Engineering Notes

Note that the integrated signal lamps cannot be actuated via the secondary hardwired terminal strip. They operate exclusively via commands sent through the CP-Link or USB protocol. If the communication interface is interrupted, status feedback via the signal lamps will be lost, even if the primary dry contacts remain connected via hardwiring.

Commissioning & Wiring Tips

Always run the emergency stop circuit through the direct terminal row directly to an approved safety evaluation unit (such as Beckhoff TwinSAFE or an external Category 4 safety relay). Do not rely on CP-Link or USB communication paths for functional safety emergency stop commands.

Installation Guidelines

1. 1 Align the physical mounting brackets of the extension module with the right-hand chassis mounting points of the CP6xxx/CP7xxx housing.
2. 2 Securely fasten the mounting screws to the specified torque limit to guarantee seal integrity and prevent vibration damage.
3. 3 Connect the USB/CP-Link communications cable to the designated rear interface port on the Control Panel.
4. 4 Route the safety circuit wiring directly from the emergency stop switch terminals to your safety controller, testing continuity before powering up the system.