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.
Engineered to deliver high-performance human-machine interface (HMI) and computing capabilities directly at the machine level, the Beckhoff CP3721-0010 is a ruggedized multi-touch Panel PC featuring an integrated 21.5-inch widescreen display with 1920 x 1080 Full HD resolution. Housed in a completely sealed IP65-rated aluminum enclosure, this unit is optimized for direct installation onto mounting arm systems. The PC architecture is designed to interface seamlessly with TwinCAT 2 and TwinCAT 3 runtime systems, offering reliable real-time execution and rich, multi-finger capacitive visualization for demanding industrial environments.
| Parameter | Specification |
|---|---|
| Manufacturer | Beckhoff |
| Model Number | CP3721-0010 |
| Device Type | Multi-touch Panel PC |
| Display Size | 21.5-inch (54.6 cm) |
| Display Resolution | 1920 x 1080 (Full HD) |
| Housing Material | Aluminum with integrated heat sink fins |
| Mounting Arm Adapter | Rotatable and tiltable for Rittal and Rolec systems (48 mm tube from top/bottom) |
| Ingress Protection Rating | IP65 (all-around protection) |
| Operating Temperature | 0 to 45 degC |
| Processor Platform | Intel Atom E3815 (1.46 GHz, 1 Core) to E3845 (1.91 GHz, 4 Cores) |
| Motherboard Class | 3.5-inch motherboard for Intel Atom x5-E38xx |
| Memory Options | 2 GB DDR3L RAM (upgradable to 8 GB DDR3L RAM ex factory) |
| Storage Slots | 2 x CFast slots (40 GB to 320 GB CFast options) |
| Ethernet Interfaces | 2 x 100/1000BASE-T (one on-board, one routed to IP65 push-pull connection) |
| Power Supply | 24 V DC (supports UPS configuration options) |
| TwinCAT Compatibility | TwinCAT 2 / TwinCAT 3 (Performance Class 40 or 50) |
| Country of Origin | Germany |
| Shipping Weight (Calculated) | 8.0 kg |
| Package Dimensions (Calculated) | 620 mm x 480 mm x 180 mm |
The Beckhoff CP3721-0010 belongs to the CP37xx premium display category. While displaying technical similarities with smaller displays in the series (such as the CP3715 or CP3719), the 21.5-inch 1080p display has different power draw and structural footprint profiles. When updating systems from older generation single-touch units, verify that your TwinCAT visual configurations are optimized for widescreen aspect ratios and that your system controller matches the corresponding TwinCAT 2/3 performance class (level 40 or 50 depending on the processor model).
A key cooling requirement for this fanless design is maintaining a minimum clearance of 20 cm (7.9 inches) in all directions around the heat sinks. Obstructing the rear passive cooling system within restricted or closed secondary control cabinets will cause internal heat accumulation. If ambient temperatures exceed 45 Celsius, the system will trigger automatic thermal throttling, reducing CPU cycle speeds to protect the motherboard.
During field installation, all connections within the wiring area must utilize genuine IP65 push-pull connectors to keep the enclosure airtight. Ensure that unused wiring entries are sealed with their factory-supplied gaskets and threaded caps. To mitigate electrical noise on the Ethernet lines when operating alongside heavy high-frequency variable frequency drives (VFDs), the mounting arm system must be grounded securely to a low-impedance ground bar.
Mount the Rittal or Rolec 48 mm mounting arm assembly securely to the supporting machinery structure.
Align the integrated rotatable/tiltable adapter of the CP3721-0010 onto the arm and tighten the mechanical locking screws.
Route the power and network cables through the arm channel directly into the terminal wiring enclosure.
Connect the IP65 push-pull cables, lock all cable glands, and verify that the front bezel sealing sits flush.
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Returns & Warranty

Engineered to deliver high-performance human-machine interface (HMI) and computing capabilities directly at the machine level, the Beckhoff CP3721-0010 is a ruggedized multi-touch Panel PC featuring an integrated 21.5-inch widescreen display with 1920 x 1080 Full HD resolution. Housed in a completely sealed IP65-rated aluminum enclosure, this unit is optimized for direct installation onto mounting arm systems. The PC architecture is designed to interface seamlessly with TwinCAT 2 and TwinCAT 3 runtime systems, offering reliable real-time execution and rich, multi-finger capacitive visualization for demanding industrial environments.
| Parameter | Specification |
|---|---|
| Manufacturer | Beckhoff |
| Model Number | CP3721-0010 |
| Device Type | Multi-touch Panel PC |
| Display Size | 21.5-inch (54.6 cm) |
| Display Resolution | 1920 x 1080 (Full HD) |
| Housing Material | Aluminum with integrated heat sink fins |
| Mounting Arm Adapter | Rotatable and tiltable for Rittal and Rolec systems (48 mm tube from top/bottom) |
| Ingress Protection Rating | IP65 (all-around protection) |
| Operating Temperature | 0 to 45 degC |
| Processor Platform | Intel Atom E3815 (1.46 GHz, 1 Core) to E3845 (1.91 GHz, 4 Cores) |
| Motherboard Class | 3.5-inch motherboard for Intel Atom x5-E38xx |
| Memory Options | 2 GB DDR3L RAM (upgradable to 8 GB DDR3L RAM ex factory) |
| Storage Slots | 2 x CFast slots (40 GB to 320 GB CFast options) |
| Ethernet Interfaces | 2 x 100/1000BASE-T (one on-board, one routed to IP65 push-pull connection) |
| Power Supply | 24 V DC (supports UPS configuration options) |
| TwinCAT Compatibility | TwinCAT 2 / TwinCAT 3 (Performance Class 40 or 50) |
| Country of Origin | Germany |
| Shipping Weight (Calculated) | 8.0 kg |
| Package Dimensions (Calculated) | 620 mm x 480 mm x 180 mm |
The Beckhoff CP3721-0010 belongs to the CP37xx premium display category. While displaying technical similarities with smaller displays in the series (such as the CP3715 or CP3719), the 21.5-inch 1080p display has different power draw and structural footprint profiles. When updating systems from older generation single-touch units, verify that your TwinCAT visual configurations are optimized for widescreen aspect ratios and that your system controller matches the corresponding TwinCAT 2/3 performance class (level 40 or 50 depending on the processor model).
A key cooling requirement for this fanless design is maintaining a minimum clearance of 20 cm (7.9 inches) in all directions around the heat sinks. Obstructing the rear passive cooling system within restricted or closed secondary control cabinets will cause internal heat accumulation. If ambient temperatures exceed 45 Celsius, the system will trigger automatic thermal throttling, reducing CPU cycle speeds to protect the motherboard.
During field installation, all connections within the wiring area must utilize genuine IP65 push-pull connectors to keep the enclosure airtight. Ensure that unused wiring entries are sealed with their factory-supplied gaskets and threaded caps. To mitigate electrical noise on the Ethernet lines when operating alongside heavy high-frequency variable frequency drives (VFDs), the mounting arm system must be grounded securely to a low-impedance ground bar.
Mount the Rittal or Rolec 48 mm mounting arm assembly securely to the supporting machinery structure.
Align the integrated rotatable/tiltable adapter of the CP3721-0010 onto the arm and tighten the mechanical locking screws.
Route the power and network cables through the arm channel directly into the terminal wiring enclosure.
Connect the IP65 push-pull cables, lock all cable glands, and verify that the front bezel sealing sits flush.
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
|