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.
Designed for seamless mechanical and electrical integration with CP6xxx and CP7xxx Control Panels and Panel PCs, the C9900-E798 provides tactile operator controls directly on the right side of the display unit. This physical push-button extension is optimized for 15-inch displays configured without an integrated keyboard, expanding local system interaction via robust control elements.
The unit features 20 illuminated push-buttons and a dedicated emergency stop button. Key press signals and lamp control commands interface with the main PC controller using a standard USB connection. For high-integrity or safety-critical circuits, a secondary mechanical contact block for each push-button is routed to a terminal strip, permitting direct wiring to safety relays or PLC digital inputs.
| BECKHOFF |
| C9900-E798 |
| 15-inch displays without integrated keyboards (CP6x23-00xx and CP7x23-00xx) |
| Right side |
| 20 push-buttons with signal lamps (Siemens Signum 30 x 30 mm) |
| 1 key (Siemens Signum, direct terminal wiring) |
| 1st normally-open contact on push-buttons, and signal lamp control |
| 2nd normally-open contact for all push-buttons |
| 0 to 55 degC |
| Interface Type | Function |
|---|---|
| USB Port | Connection to Host Panel PC (Control of lamps, 1st contact read) |
| Terminal Row | Direct mechanical connection for secondary push-button contacts |
| Emergency Stop Terminals | Dedicated, isolated contacts for emergency stop safety loop |
Global Express Shipping
Returns & Warranty

Designed for seamless mechanical and electrical integration with CP6xxx and CP7xxx Control Panels and Panel PCs, the C9900-E798 provides tactile operator controls directly on the right side of the display unit. This physical push-button extension is optimized for 15-inch displays configured without an integrated keyboard, expanding local system interaction via robust control elements.
The unit features 20 illuminated push-buttons and a dedicated emergency stop button. Key press signals and lamp control commands interface with the main PC controller using a standard USB connection. For high-integrity or safety-critical circuits, a secondary mechanical contact block for each push-button is routed to a terminal strip, permitting direct wiring to safety relays or PLC digital inputs.
| BECKHOFF |
| C9900-E798 |
| 15-inch displays without integrated keyboards (CP6x23-00xx and CP7x23-00xx) |
| Right side |
| 20 push-buttons with signal lamps (Siemens Signum 30 x 30 mm) |
| 1 key (Siemens Signum, direct terminal wiring) |
| 1st normally-open contact on push-buttons, and signal lamp control |
| 2nd normally-open contact for all push-buttons |
| 0 to 55 degC |
| Interface Type | Function |
|---|---|
| USB Port | Connection to Host Panel PC (Control of lamps, 1st contact read) |
| Terminal Row | Direct mechanical connection for secondary push-button contacts |
| Emergency Stop Terminals | Dedicated, isolated contacts for emergency stop safety loop |
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
|