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.
Integrating physical tactile controls directly alongside industrial visual interfaces, the Beckhoff C9900-E748 provides local machine operator interfaces for compatible 15-inch display configurations. This push-button extension is designed to mount on the right-hand side of CP6xxx and CP7xxx series Control Panels and Panel PCs, specifically matching models without integrated hardware keyboards. By adding functional hardware controls to industrial HMI terminals, the assembly provides immediate tactile responses for critical machine commands without occupying display screen space.
The unit features 16 Siemens Signum square push-button keys, each measuring 30 x 30 mm and featuring an integrated signal lamp. Customizable slip-in labels allow operators to mark each push-button with application-specific symbols or text. For safety-critical stopping procedures, a dedicated Siemens Signum emergency stop pushbutton is located directly on the faceplate, engineered to support physical, independent safety circuits.
Communication architectures on the module utilize twin connection profiles. Button state transmissions are processed digitally over a CP-Link or USB bus interface utilizing a primary normally-open (NO) contact logic. For redundant signals or localized hardwiring, a terminal row allows all 16 push-buttons to be integrated physically using a second, independent normally-open (NO) contact. Commands to illuminate the integrated signal lamps are transmitted exclusively through the digital CP-Link or USB communication interface.
| Manufacturer | BECKHOFF |
| Part Number / Model | C9900-E748 |
| Compatible Displays | 15-inch Control Panels / Panel PCs without keyboards (e.g., CP6x02-00xx, CP7x02-00xx) |
| Mounting Location | Right side |
| Control Elements | 16 square push-buttons (30 x 30 mm, Siemens Signum), 1 Emergency Stop button (Siemens Signum) |
| Communication Interface | CP-Link or USB |
| Contact Configuration | 1st NO contact (via CP-Link/USB), 2nd NO contact (via terminal row) |
| Signaling Lights | 16 signal lamps controlled over CP-Link/USB only |
| Shipping Weight | 5 kg |
| Interface / Connector Type | Function Description |
|---|---|
| CP-Link / USB Interface Connection | Transmits primary push-button signals (1st NO contact) and controls all integrated signal lamps. |
| Terminal Row Block | Provides physical wire connection points for secondary normally-open (NO) push-button contacts. |
| Emergency Stop Terminals | Direct physical wire connection for the integrated Emergency Stop button. |
Global Express Shipping
Returns & Warranty

Integrating physical tactile controls directly alongside industrial visual interfaces, the Beckhoff C9900-E748 provides local machine operator interfaces for compatible 15-inch display configurations. This push-button extension is designed to mount on the right-hand side of CP6xxx and CP7xxx series Control Panels and Panel PCs, specifically matching models without integrated hardware keyboards. By adding functional hardware controls to industrial HMI terminals, the assembly provides immediate tactile responses for critical machine commands without occupying display screen space.
The unit features 16 Siemens Signum square push-button keys, each measuring 30 x 30 mm and featuring an integrated signal lamp. Customizable slip-in labels allow operators to mark each push-button with application-specific symbols or text. For safety-critical stopping procedures, a dedicated Siemens Signum emergency stop pushbutton is located directly on the faceplate, engineered to support physical, independent safety circuits.
Communication architectures on the module utilize twin connection profiles. Button state transmissions are processed digitally over a CP-Link or USB bus interface utilizing a primary normally-open (NO) contact logic. For redundant signals or localized hardwiring, a terminal row allows all 16 push-buttons to be integrated physically using a second, independent normally-open (NO) contact. Commands to illuminate the integrated signal lamps are transmitted exclusively through the digital CP-Link or USB communication interface.
| Manufacturer | BECKHOFF |
| Part Number / Model | C9900-E748 |
| Compatible Displays | 15-inch Control Panels / Panel PCs without keyboards (e.g., CP6x02-00xx, CP7x02-00xx) |
| Mounting Location | Right side |
| Control Elements | 16 square push-buttons (30 x 30 mm, Siemens Signum), 1 Emergency Stop button (Siemens Signum) |
| Communication Interface | CP-Link or USB |
| Contact Configuration | 1st NO contact (via CP-Link/USB), 2nd NO contact (via terminal row) |
| Signaling Lights | 16 signal lamps controlled over CP-Link/USB only |
| Shipping Weight | 5 kg |
| Interface / Connector Type | Function Description |
|---|---|
| CP-Link / USB Interface Connection | Transmits primary push-button signals (1st NO contact) and controls all integrated signal lamps. |
| Terminal Row Block | Provides physical wire connection points for secondary normally-open (NO) push-button contacts. |
| Emergency Stop Terminals | Direct physical wire connection for the integrated Emergency Stop button. |
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
|