Beckhoff C9900-E805 CP6xxx/CP7xxx Series Push-Button Extension

Description

Facilitating robust physical human-machine interface interaction, the Beckhoff C9900-E805 mounts directly to the right side of CP6x21-00xx and CP7x21-00xx Control Panels and Panel PCs with 15-inch displays. This push-button extension provides operators with tactile physical controls alongside the touchscreen interface. Designed for environments requiring high mechanical feedback, the unit integrates twelve customizable square push-buttons and an integrated, directly wireable emergency stop device. By offering two parallel communication paths—integrated serial digital transmission via CP-Link or USB, alongside secondary direct-wiring physical terminals—this hardware extension ensures critical machine execution commands remain highly reliable and deterministically wired back to safety controllers or PLC input cards.

Key Features

• Optimized Form Factor: Engineered specifically for right-side mounting on 15-inch Beckhoff control units without built-in keyboards.
• Industrial Control Elements: Equipped with 12 square 30 x 30 mm Siemens Signum push-button keys, each featuring integrated software-controlled signal lamps.
• Dedicated Safety HMI: Includes 1 heavy-duty Siemens Signum emergency stop button, designed for direct hardwiring into safety-rated control circuits.
• Dual-Channel Interface: Operates primarily over CP-Link or USB for command transmission and signal lamp control, paired with an auxiliary terminal block enabling physical hardwiring of a second normally-open contact for every button.
• Customizable Legend Plates: Clear, slide-in labeling pockets allow localized and application-specific key marking.

Applications

• Automotive assembly line Operator Control Stations (OCS).
• Metalworking machinery and CNC tooling centers requiring physical Cycle Start/Feed Hold interaction.
• Packaging, sorting, and material handling systems requiring local visual indication and emergency isolation capability.
• Explosive or challenging production areas where wet-glove touch panel operation is supplemented by physical push-buttons.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

The C9900-E805 unit is tailored strictly for 15-inch Control Panels. It cannot be retrofitted to smaller (e.g., 12-inch) or larger (e.g., 19-inch) display housings due to structural mounting spacing and cable harnesses. Since this is in its Service Phase, existing systems running CP6x21 or CP7x21 hardware should maintain a backup spare of this model. If transitioning to newer CP2xxx or CP3xxx panels, a different generation of push-button extensions is required, as the electrical interface signals differ.

Application Pitfalls & Engineering Notes

While the push-buttons are transmitted digitally via CP-Link or USB under normal operation, never rely on the USB or CP-Link serial communication pathway for emergency isolation. The emergency stop button must always be hardwired directly from its rear contacts to safety-rated safety relays (such as EL6900 or dedicated safety modules) to meet SIL 3/Category 4 safety directives.

Commissioning & Wiring Tips

When configuring the auxiliary terminal rows for dry contact wiring, ensure control wiring does not run parallel to high-voltage, high-frequency motor cables to prevent EMI. Grounding the frame of the associated CP6xxx/CP7xxx panel via the ground stud is mandatory for the internal digital encoders to operate reliably without signal dropouts.

Installation Guidelines