Beckhoff KL1809 – Bus Terminal with 16-Channel Digital Inputs for 24V DC Signals

The Beckhoff KL1809 is a digital input bus terminal. Specifically, this terminal acquires binary 24V DC control signals from the process level. It then transmits these signals in an electrically isolated form to the higher-level automation unit. Furthermore, this terminal contains sixteen channels with LED status indicators. In addition, the power contacts are connected through for convenient field power distribution. For this reason, this terminal suits high-density digital input applications in space-constrained control cabinets.

Ordering Configuration and Product Identification

• Product Type: Bus Terminal, 16-channel digital input.

• Voltage Rating: 24 V DC.

• Input Filter: 3 ms typical.

• Product Status: Regular delivery.

• Connection Technology: 1-wire.

• Reference Ground: 0 V DC power contact for all inputs.

• Housing Type: HD (High Density) housing with signal LEDs.

• Housing Material: Polycarbonate.

• Dimensions (W x H x D): 12 mm x 100 mm x 68 mm.

• Weight: Approximately 60 grams.

• Tool-free Connection: Direct plug-in technology for solid wire conductors.

• Packing Density: 16 connection points in 12 mm terminal block housing.

• Space-saving Use: Ideal for control cabinets with limited space.

• As a result, the Beckhoff KL1809 offers exceptional space efficiency with 16 inputs in a slim 12mm package.

Input Specifications

• Number of Inputs: 16 channels total.

• Specification: EN 61131-2, type 1/3 compliant.

• "0" Signal Voltage: -3 to +5 V (per EN 61131-2, type 1/3).

• "1" Signal Voltage: 11 to 30 V (per EN 61131-2, type 3).

• Input Filter (typical): 3.0 milliseconds.

• Input Current (typical): 3 mA (per EN 61131-2, type 3).

• Input Type: Type 1/3 for broad sensor compatibility.

• Filter Benefit: No bouncing occurs due to mechanical switches.

• Signal Indication: LED illuminates for each active channel.

• Sensor Connection: Direct connection of multi-channel sensors in 1-wire technology.

• Smallest Space: Achieves maximum density in the smallest possible area.

• Therefore, the KL1809 accepts standard 24V DC sensors with excellent noise immunity.

Current Consumption and Electrical Isolation

• Current Consumption (K-bus, typical): 20 mA.

• Current Consumption (Power contacts, typical): 4 mA plus load.

• Electrical Isolation: 500 V (K-bus/field potential).

• Bit Width in Process Image: 16 inputs automatically.

• Configuration: No address or configuration setting is required.

• Reference Ground: Common 0V DC power contact for all inputs.

• Field Power Distribution: Power contacts are connected through.

• Installation Ease: Simply plug the terminal onto the K-bus.

• Electrically Isolated: Safe separation between K-bus and field signals.

• Consequently, the Beckhoff KL1809 is truly plug-and-play with automatic K-bus integration.

Temperature and Environmental Ratings

• Operating Temperature Range: -25°C to +60°C.

• Storage Temperature Range: -40°C to +85°C.

• Relative Humidity: 95% maximum, no condensation.

• Vibration Resistance: Conforms to EN 60068-2-6.

• Shock Resistance: Conforms to EN 60068-2-27.

• EMC Immunity: Conforms to EN 61000-6-2.

• EMC Emission: Conforms to EN 61000-6-4.

• Protection Rating: IP20.

• Installation Position: Variable (see documentation for details).

• Approvals/Markings: CE, UL, ATEX, IECEx, DNV GL.

• Marine Approval: DNV GL certified for shipboard applications.

• Wide Temperature Range: Suitable for both cold and hot environments.

• Moreover, the Beckhoff KL1809 withstands harsh industrial environments and hazardous locations.

Hazardous Area Approvals

• ATEX Marking: II 3 G Ex nA IIC T4 Gc.

• IECEx Marking: Ex ec IIC T4 Gc.

• Gas Group: IIC (hydrogen, acetylene, and other high-risk gases).

• Temperature Class: T4 (135°C maximum surface temperature).

• Equipment Protection Level: Gc (safe area normal operation).

• Application: Zone 2 hazardous locations (normal operation, low risk).

• Installation Requirement: Follow ATEX/IECEx documentation for safe installation.

• Gas Group Compatibility: Suitable for all gas groups including IIC.

• Safety Note: Do not disconnect under load in hazardous areas.

• Compliance: Meets stringent European and international safety standards.

• Therefore, the KL1809 is certified for use in potentially explosive atmospheres.

Housing and Mechanical Data

• Housing Design Form: HD (High Density) housing.

• Housing Material: Polycarbonate.

• Dimensions (Width): 12 mm (ultra-slim).

• Dimensions (Height): 100 mm.

• Dimensions (Depth): 68 mm.

• Mounting: On 35 mm DIN rail conforming to EN 60715 with lock.

• Side by Side Mounting: Double slot and key connection for secure alignment.

• Packing Density: 16 connection points in only 12 mm width.

• Space Saving: Direct connection of multi-channel sensors in 1-wire technology.

• Application: Space-critical control cabinets and junction boxes.

• Weight: Approx. 60 grams (lightweight for easy handling).

• Robust Construction: Designed for industrial use and long service life.

• Thus, the Beckhoff KL1809 maximizes I/O density in minimal panel space.

Wiring and Connection Data

• Wiring Type (Solid Conductors): Direct plug-in technique (tool-free).

• Wiring Type (Fine-stranded): Spring actuation by screwdriver.

• Wiring Type (Ferrules): Spring actuation by screwdriver.

• Connection Cross-section (Solid): 0.08 to 1.5 mm².

• Connection Cross-section (Stranded): 0.25 to 1.5 mm².

• Connection Cross-section (With ferrule): 0.14 to 0.75 mm².

• Stripping Length: 8 to 9 mm for all wire types.

• Connection Technology: 1-wire per input channel.

• Tool-free Advantage: No screwdrivers are needed for solid wires.

• Speed: Installation is significantly faster than screw terminals.

• Reliability: Spring connection ensures vibration-proof termination.

• Ease of Use: Simple and intuitive wiring process.

• Consequently, the KL1809 significantly reduces wiring time and maintenance effort.

Installation Guide

First, verify that all system power sources are completely disconnected. Then, mount the Beckhoff KL1809 on a 35 mm DIN rail conforming to EN 60715. After that, engage the lock to secure the terminal firmly in place. Next, connect the K-bus by pushing the terminal onto the adjacent bus terminal. The side-by-side double slot and key connection ensures proper alignment. Then, connect the 24V DC field power to the power contacts. The reference ground for all inputs is the 0V DC power contact. After that, wire your digital input sensors to the 16 input channels. For solid wire conductors, use direct plug-in technology (tool-free). For fine-stranded wires or ferrules, use a screwdriver for spring actuation. Ensure stripping length is 8-9 mm for all connections. Then, observe the input voltage requirements carefully: "0" signal between -3V and +5V, "1" signal between 11V and 30V. The typical input current is 3 mA at 24V DC. After that, apply power to the system. The Beckhoff KL1809 requires no address or configuration settings. Finally, monitor the 16 green LEDs to verify input status for each channel. As a result, the Beckhoff KL1809 will provide reliable digital input acquisition.

Packaging List

• One Beckhoff KL1809 bus terminal (16-channel digital input)

• One product identification label

• One installation and wiring guide

• One ATEX/IECEx certification sheet

Common FAQs

Q1: How many inputs does the Beckhoff KL1809 provide?
A: This bus terminal provides 16 digital input channels. It uses 1-wire connection technology for each input. Therefore, it suits high-density applications with multi-channel sensors in minimal space.

Q2: What is the input filter time on the KL1809?
A: The typical input filter time is 3.0 milliseconds. This filter eliminates bouncing from mechanical switches. Consequently, no external debouncing circuitry is required for reliable signal reading.

Q3: Does the Beckhoff KL1809 require configuration?
A: No, this terminal requires no address or configuration setting. The bit width in the process image is automatically assigned as 16 inputs. Therefore, it is truly plug-and-play for easy commissioning.

Q4: Is the KL1809 approved for hazardous locations?
A: Yes, it has ATEX approval (II 3 G Ex nA IIC T4 Gc). It also has IECEx approval (Ex ec IIC T4 Gc). Therefore, it can be installed in Zone 2 hazardous areas safely.

Q5: What is the connection method for the Beckhoff KL1809?
A: Solid wire conductors use direct plug-in technology (tool-free). Fine-stranded wires and ferrules require spring actuation by screwdriver. Stripping length is 8 to 9 mm for all connection types.