KL1804 - Beckhoff Bus Terminal Digital Input
Beckhoff offers the KL1804 Bus Terminal Digital Input, a compact and efficient Bus Terminal designed for reliable signal processing in automation systems.
| Brand | Beckhoff |
| Product Type | Bus Terminal Digital Input |
| Product | KL1804 |
KL1804 Beckhoff Bus Terminal Digital Input Technical Specifications
| Specification | Value |
|---|---|
| Connection technology | 3-wire |
| Specification | EN 61131-2, type 1/3 |
| Number of inputs | 4 |
| Nominal voltage | 24 V DC (-15%/+20%) |
| "0" signal voltage | -3..+5 V (EN 61131-2, type 1/3) |
| "1" signal voltage | 11...30 V (EN 61131-2, type 3) |
| Input filter | typ. 3.0 ms |
| Input current | typ. 3 mA (EN 61131-2, type 3) |
| Current consumption K-bus | typ. 10 mA |
| Bit width in the process image | 4 inputs |
| Configuration | no address or configuration setting |
| Weight | approx. 60 g |
| Operating temperature | 0...55°C |
| Storage temperature | -25...+85°C |
| 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 |
| Protect. rating/installation pos. | IP20/variable (see documentation) |
| Approvals/markings | CE, CCC, UL, ATEX, IECEx, DNV GL |
| Ex marking | ATEX:II 3 G Ex ec IIC T4 GcIECEx:Ex ec IIC T4 Gc |
| Housing - Design form | HD (High Density) housing with signal LEDs |
| Housing - Material | polycarbonate |
| Housing - Dimensions (W x H x D) | 12Â mm x 100Â mm x 68 mm |
| Housing - Installation | on 35 mm DIN rail, conforming to EN 60715 with lock |
| Housing - Side by side mounting by means of | double slot and key connection |
| Housing - Marking | â |
| Housing - Wiring | solid conductors (s): direct plug-in technique; fine-stranded conductors (st) and ferrule (f): spring actuation by screwdriver |
| Housing - Connection cross-section | s*: 0.08...2.5 mm²,st*: 0.08...2.5 mm²,f*: 0.14...1.5 mm² |
| Housing - Connection cross-section AWG | s*: AWG28...14,st*: AWG28...14,f*: AWG26...16 |
| Housing - Stripping length | 8...9 mm |
| Current consumption power contacts | typ. 1 mA + load |
The Beckhoff KL1804 Bus Terminal Digital Input is designed for accurate and efficient digital signal processing in automation systems. With a compact polycarbonate housing measuring 12 x 100 x 68 mm, it saves cabinet space without compromising durability. Supporting 3-wire connection technology and compliant with EN 61131-2 type 1/3, it provides consistent input recognition at a 24 V DC nominal voltage. The module handles “0” signals between -3 to +5 V and “1” signals from 11 to 30 V, ensuring dependable operation across various control tasks.
Equipped with four digital inputs, each channel draws a typical 3 mA input current and integrates a 3.0 ms filter to eliminate electrical noise. The unit consumes only 10 mA via the K-bus, making it energy-efficient in large-scale automation networks. Clear status indication is provided through signal LEDs, while the spring-actuated wiring system allows easy connection of solid, flexible, or ferrule conductors. Certified with CE, UL, CCC, ATEX, IECEx, and DNV GL, and tested against vibration and EMC standards, the KL1804 offers proven reliability in industrial environments.
Applications of the KL1804 Bus Terminal Digital Input include monitoring push buttons, limit switches, and sensor signals in automotive assembly lines, packaging machines, and process plants. Electrical panel builders use it for compact I/O expansion, while engineering institutes employ the terminal in automation labs to train students on PLC and fieldbus technology. Maintenance engineers benefit from its straightforward installation, robust design, and long service life. Backed by international certifications and trusted by OEMs, system integrators, and industries across India, the Beckhoff KL1804 is a dependable solution for digital input applications. For complete specifications, refer to the official Beckhoff product page or request a callback for support on your project needs.
