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 EL1889 digital input terminal is designed to acquire binary control signals from the physical field level and transmit them to the higher-level automation controller via the EtherCAT network. Featuring a highly compact High Density (HD) housing, this terminal provides sixteen distinct input points within a 12 mm physical width to optimize control cabinet space utilization.
This terminal is built for 1-wire connection technology and operates with ground-switching (sinking) sensors. The BECKHOFF EL1889 processes 24 V DC signals, identifying a logical "1" status at low voltage levels (0 to 7 V) and a logical "0" status at higher voltage levels (18 to 30 V). High-density connection terminals allow direct wiring of solid-wire conductors without additional tools, facilitating efficient high-density installations.
| Manufacturer | BECKHOFF |
| Model | EL1889 |
| Product Type | EtherCAT Terminal |
| Design Form | HD (High Density) housing with signal LEDs |
| Housing Material | Polycarbonate |
| Nominal Voltage | 24 V DC (-15% / +20%) |
| "0" Signal Voltage | 18 to 30 V (Sinking Logic) |
| "1" Signal Voltage | 0 to 7 V (Sinking Logic) |
| Input Current | typ. 3.0 mA |
| Input Filter Delay | typ. 3.0 ms |
| Current Consumption E-bus | typ. 110 mA |
| Current Consumption Power Contacts | typ. 35 mA |
| Current Load Power Contacts (Imax) | 10 A |
| Electrical Isolation | 500 V (E-bus/field potential) |
| Connection Technology | 1-wire |
| Number of Inputs | 16 |
| Solid Wire Connection Cross-Section | 0.08 to 1.5 mm² (AWG 28 to 16) |
| Stranded Wire Connection Cross-Section | 0.25 to 1.5 mm² (AWG 22 to 16) |
| Fine-Stranded Wire (with Ferrule) | 0.14 to 0.75 mm² (AWG 26 to 19) |
| Stripping Length | 8 to 9 mm |
| Dimensions (W x H x D) | 12 mm x 100 mm x 68 mm |
| Mounting | 35 mm DIN rail (conforming to EN 60715) with lock |
| Operating Temperature | -25 to +60 degC |
| Storage Temperature | -40 to +85 degC |
| Relative Humidity | 95%, no condensation |
| Vibration/Shock Resistance | Conforms to EN 60068-2-6 / EN 60068-2-27 |
| EMC Immunity/Emission | Conforms to EN 61000-6-2 / EN 61000-6-4 |
| Protection Class | IP20 |
| Approvals | CE, UL, ATEX (II 3 G Ex nA IIC T4 Gc) |
Global Express Shipping
Returns & Warranty

The BECKHOFF EL1889 digital input terminal is designed to acquire binary control signals from the physical field level and transmit them to the higher-level automation controller via the EtherCAT network. Featuring a highly compact High Density (HD) housing, this terminal provides sixteen distinct input points within a 12 mm physical width to optimize control cabinet space utilization.
This terminal is built for 1-wire connection technology and operates with ground-switching (sinking) sensors. The BECKHOFF EL1889 processes 24 V DC signals, identifying a logical "1" status at low voltage levels (0 to 7 V) and a logical "0" status at higher voltage levels (18 to 30 V). High-density connection terminals allow direct wiring of solid-wire conductors without additional tools, facilitating efficient high-density installations.
| Manufacturer | BECKHOFF |
| Model | EL1889 |
| Product Type | EtherCAT Terminal |
| Design Form | HD (High Density) housing with signal LEDs |
| Housing Material | Polycarbonate |
| Nominal Voltage | 24 V DC (-15% / +20%) |
| "0" Signal Voltage | 18 to 30 V (Sinking Logic) |
| "1" Signal Voltage | 0 to 7 V (Sinking Logic) |
| Input Current | typ. 3.0 mA |
| Input Filter Delay | typ. 3.0 ms |
| Current Consumption E-bus | typ. 110 mA |
| Current Consumption Power Contacts | typ. 35 mA |
| Current Load Power Contacts (Imax) | 10 A |
| Electrical Isolation | 500 V (E-bus/field potential) |
| Connection Technology | 1-wire |
| Number of Inputs | 16 |
| Solid Wire Connection Cross-Section | 0.08 to 1.5 mm² (AWG 28 to 16) |
| Stranded Wire Connection Cross-Section | 0.25 to 1.5 mm² (AWG 22 to 16) |
| Fine-Stranded Wire (with Ferrule) | 0.14 to 0.75 mm² (AWG 26 to 19) |
| Stripping Length | 8 to 9 mm |
| Dimensions (W x H x D) | 12 mm x 100 mm x 68 mm |
| Mounting | 35 mm DIN rail (conforming to EN 60715) with lock |
| Operating Temperature | -25 to +60 degC |
| Storage Temperature | -40 to +85 degC |
| Relative Humidity | 95%, no condensation |
| Vibration/Shock Resistance | Conforms to EN 60068-2-6 / EN 60068-2-27 |
| EMC Immunity/Emission | Conforms to EN 61000-6-2 / EN 61000-6-4 |
| Protection Class | IP20 |
| Approvals | CE, UL, ATEX (II 3 G Ex nA IIC T4 Gc) |
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
|