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 IP2021-B400 is a high-performance Fieldbus Box designed for decentralized automation environments. Acting as an Interbus-compatible distributed I/O module, this device enables direct machine-mount installation without the need for a protective control cabinet. It is equipped with 8 digital outputs operating at 24 V DC to interface directly with actuators at the field level.
Engineered for harsh industrial operating conditions, the BECKHOFF IP2021-B400 features a fully sealed IP67-rated housing. This construction ensures robust resistance to moisture, dust, and mechanical stress, reducing overall wiring complexity and installation costs. By transferring actuator signals directly from the Interbus fieldbus network to local machinery components, it optimizes cycle times and enhances system reliability.
| Parameter | Specification |
|---|---|
| Manufacturer | BECKHOFF |
| Model | IP2021-B400 |
| Product Type | Fieldbus Box |
| Fieldbus Protocol | Interbus |
| Number of Channels | 8 digital outputs |
| Nominal Voltage | 24 V DC |
| Max. Output Current | 2 A per channel |
| Connection Technology | M8 screw connectors (for I/O) |
| Protection Rating | IP67 |
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Returns & Warranty

The BECKHOFF IP2021-B400 is a high-performance Fieldbus Box designed for decentralized automation environments. Acting as an Interbus-compatible distributed I/O module, this device enables direct machine-mount installation without the need for a protective control cabinet. It is equipped with 8 digital outputs operating at 24 V DC to interface directly with actuators at the field level.
Engineered for harsh industrial operating conditions, the BECKHOFF IP2021-B400 features a fully sealed IP67-rated housing. This construction ensures robust resistance to moisture, dust, and mechanical stress, reducing overall wiring complexity and installation costs. By transferring actuator signals directly from the Interbus fieldbus network to local machinery components, it optimizes cycle times and enhances system reliability.
| Parameter | Specification |
|---|---|
| Manufacturer | BECKHOFF |
| Model | IP2021-B400 |
| Product Type | Fieldbus Box |
| Fieldbus Protocol | Interbus |
| Number of Channels | 8 digital outputs |
| Nominal Voltage | 24 V DC |
| Max. Output Current | 2 A per channel |
| Connection Technology | M8 screw connectors (for I/O) |
| Protection Rating | IP67 |
Global Express Shipping
Returns & Warranty
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For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
Germany
|