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 directly with the right-hand chassis of 15-inch CP6x22-00xx and CP7x22-00xx Control Panels and Panel PCs, the BECKHOFF C9900-E965 delivers a rugged, physical operator control interface for industrial display units that do not have integrated keyboards. Currently positioned in its service lifecycle phase, this module bridges physical hardwired pilot devices with standardized bus communication architectures.
| Manufacturer | Beckhoff Automation |
| Model Number | C9900-E965 |
| Compatible Hosts | CP6x22-00xx and CP7x22-00xx (15-inch displays without keyboard) |
| Mounting Configuration | Right-side chassis attachment |
| Operator Elements | 14 push-buttons (30 x 30 mm) + 1 Emergency Stop button |
| Button/Lamp Model | Siemens Signum Series |
| Contact Configuration | 1st NO via USB/CP-Link; 2nd NO via hardwired terminal block |
| Lamp Transmission | Bus-controlled only (USB or CP-Link) |
| Lifecycle Status | Service Phase (Legacy Support) |
| Shipping Weight (Calculated) | 5.0 kg |
| Interface Type | Channel Type | Functional Allocation |
|---|---|---|
| CP-Link / USB Port | Bus Interface | Primary NO switch states and power/control command signals for LEDs. |
| Internal Terminal Strip | Dry Contact Blocks | Secondary physical NO contacts for external 24V DC discrete PLC I/O wiring. |
| E-Stop Terminals | Dedicated Dry Contact | Direct loop wiring to dual-channel safety relays or safety controller input cards. |
The C9900-E965 is mechanically matched to first-generation CP6x22 and CP7x22 panels with 15-inch displays. It is not compatible with multi-touch CP2xxx or CP3xxx control panels, which utilize different latching rails and profile designs. When replacing, confirm your existing host has the appropriate side-bracket recesses.
Because the 14 signal lamps rely entirely on CP-Link or USB communication, a host PC lockup or software-driver crash will result in the lamps retaining their last state or turning off entirely, regardless of physical key actuation. Do not program critical state indications or safety status indicators on these LEDs; always route physical status lines through independent indicators if required by risk assessments.
When utilizing the second normally-open contacts via the physical terminal row, verify that field wiring runs do not parallel high-voltage AC lines. Shielded cabling is recommended for terminal row lines running over 10 meters inside the enclosure to eliminate cross-talk and transient noise on the 24V DC discrete inputs.
Global Express Shipping
Returns & Warranty

Integrating directly with the right-hand chassis of 15-inch CP6x22-00xx and CP7x22-00xx Control Panels and Panel PCs, the BECKHOFF C9900-E965 delivers a rugged, physical operator control interface for industrial display units that do not have integrated keyboards. Currently positioned in its service lifecycle phase, this module bridges physical hardwired pilot devices with standardized bus communication architectures.
| Manufacturer | Beckhoff Automation |
| Model Number | C9900-E965 |
| Compatible Hosts | CP6x22-00xx and CP7x22-00xx (15-inch displays without keyboard) |
| Mounting Configuration | Right-side chassis attachment |
| Operator Elements | 14 push-buttons (30 x 30 mm) + 1 Emergency Stop button |
| Button/Lamp Model | Siemens Signum Series |
| Contact Configuration | 1st NO via USB/CP-Link; 2nd NO via hardwired terminal block |
| Lamp Transmission | Bus-controlled only (USB or CP-Link) |
| Lifecycle Status | Service Phase (Legacy Support) |
| Shipping Weight (Calculated) | 5.0 kg |
| Interface Type | Channel Type | Functional Allocation |
|---|---|---|
| CP-Link / USB Port | Bus Interface | Primary NO switch states and power/control command signals for LEDs. |
| Internal Terminal Strip | Dry Contact Blocks | Secondary physical NO contacts for external 24V DC discrete PLC I/O wiring. |
| E-Stop Terminals | Dedicated Dry Contact | Direct loop wiring to dual-channel safety relays or safety controller input cards. |
The C9900-E965 is mechanically matched to first-generation CP6x22 and CP7x22 panels with 15-inch displays. It is not compatible with multi-touch CP2xxx or CP3xxx control panels, which utilize different latching rails and profile designs. When replacing, confirm your existing host has the appropriate side-bracket recesses.
Because the 14 signal lamps rely entirely on CP-Link or USB communication, a host PC lockup or software-driver crash will result in the lamps retaining their last state or turning off entirely, regardless of physical key actuation. Do not program critical state indications or safety status indicators on these LEDs; always route physical status lines through independent indicators if required by risk assessments.
When utilizing the second normally-open contacts via the physical terminal row, verify that field wiring runs do not parallel high-voltage AC lines. Shielded cabling is recommended for terminal row lines running over 10 meters inside the enclosure to eliminate cross-talk and transient noise on the 24V DC discrete inputs.
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
|