Implementing 3-Switch XOR Ladder Logic with Internal Bit
Implement a 3-SPST switch XOR light circuit in LogixPro or RSLogix 500 using an internal relay bit. Includes truth tables, boolean equations, and verified.
The BECKHOFF C9900-E665 is a specialized push-button extension designed for right-side mounting on CP6xxx and CP7xxx Control Panels and Panel PCs equipped with 15-inch displays and numeric keyboards. Currently maintained in its service phase, this extension provides local physical control capabilities directly adjacent to the visualization interface, facilitating efficient and tactile machine-level operation.
This unit integrates a selection of physical operator keys with direct electrical integration options. It is equipped with 14 square push-button keys featuring integrated signal lamps for status feedback, alongside a dedicated emergency stop button. The system transmits control signals both digitally and via traditional wiring paths, ensuring compatibility with standard logic controllers and hardwired safety systems.
| Parameter | Specification |
|---|---|
| Manufacturer | BECKHOFF |
| Model Number | C9900-E665 |
| Product Type | Push-button extension |
| Compatible Panels | CP6x22-00xx and CP7x22-00xx (15-inch display with numeric keyboard) |
| Mounting Location | Right side of the control panel |
| Push-Button Quantity | 14 keys with integrated signal lamps |
| Push-Button Type | Siemens Signum square, 30 x 30 mm |
| Emergency Stop | 1 key (Siemens Signum, directly wireable) |
| Key Interface 1 | 1 normally-open contact via CP-Link or USB |
| Key Interface 2 | 1 normally-open contact via direct-wiring terminal block |
| Signal Lamp Interface | CP-Link or USB transmission only |
| Lifecycle Status | Service phase (replacement and maintenance support) |
When replacing a legacy BECKHOFF C9900-E665, tag and record all hardwired safety and terminal row connections prior to removal. Ensure the replacement matches the specific panel dimensions (15-inch) and mounting alignment (right side) of the original unit. Always test the hardwired safety loop associated with the Siemens Signum emergency stop button to confirm immediate circuit interruption capability before resuming active machinery operation.
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Returns & Warranty

The BECKHOFF C9900-E665 is a specialized push-button extension designed for right-side mounting on CP6xxx and CP7xxx Control Panels and Panel PCs equipped with 15-inch displays and numeric keyboards. Currently maintained in its service phase, this extension provides local physical control capabilities directly adjacent to the visualization interface, facilitating efficient and tactile machine-level operation.
This unit integrates a selection of physical operator keys with direct electrical integration options. It is equipped with 14 square push-button keys featuring integrated signal lamps for status feedback, alongside a dedicated emergency stop button. The system transmits control signals both digitally and via traditional wiring paths, ensuring compatibility with standard logic controllers and hardwired safety systems.
| Parameter | Specification |
|---|---|
| Manufacturer | BECKHOFF |
| Model Number | C9900-E665 |
| Product Type | Push-button extension |
| Compatible Panels | CP6x22-00xx and CP7x22-00xx (15-inch display with numeric keyboard) |
| Mounting Location | Right side of the control panel |
| Push-Button Quantity | 14 keys with integrated signal lamps |
| Push-Button Type | Siemens Signum square, 30 x 30 mm |
| Emergency Stop | 1 key (Siemens Signum, directly wireable) |
| Key Interface 1 | 1 normally-open contact via CP-Link or USB |
| Key Interface 2 | 1 normally-open contact via direct-wiring terminal block |
| Signal Lamp Interface | CP-Link or USB transmission only |
| Lifecycle Status | Service phase (replacement and maintenance support) |
When replacing a legacy BECKHOFF C9900-E665, tag and record all hardwired safety and terminal row connections prior to removal. Ensure the replacement matches the specific panel dimensions (15-inch) and mounting alignment (right side) of the original unit. Always test the hardwired safety loop associated with the Siemens Signum emergency stop button to confirm immediate circuit interruption capability before resuming active machinery operation.
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
Germany
|