BECKHOFF KL1809 Digital Input Terminal – 16Ch 24V DC Bus Module

KL1809 Digital Input Terminal – 16-Channel 24 V DC

The BECKHOFF KL1809 is a compact 16-channel digital input terminal for 24 V DC control signals. It transfers binary signals from the process level to the automation unit with electrical isolation. Its 3 ms input filter eliminates switch bouncing, ensuring stable signal acquisition. The terminal supports tool‑free wiring via direct plug‑in technology for solid conductors. With 16 channels in a 12 mm housing, it offers high‑density space‑saving installation.

Key Features

• 16 digital inputs – 24 V DC, type 1/3 per EN 61131‑2
• 3 ms input filter – suppresses mechanical switch bouncing
• Tool‑free connection – direct plug‑in for solid wires (0.08…1.5 mm²)
• High packing density – 16 connection points in 12 mm housing
• LED status indicators for each channel
• Electrical isolation – 500 V between K‑bus and field potential
• No configuration needed – plug & play operation
• Broad approvals – CE, UL, ATEX, IECEx, DNV GL

Technical Data

• Brand: BECKHOFF
• Model: KL1809
• Series: Bus Terminal
• Module type: Digital Input (16-channel)
• Input specification: EN 61131‑2, type 1/3
• “0” signal voltage: -3…+5 V
• “1” signal voltage: 11…30 V (type 3)
• Input filter time: typ. 3.0 ms
• Input current: typ. 3 mA (type 3)
• K‑bus current consumption: typ. 20 mA
• Power contact current: typ. 4 mA + load
• Electrical isolation: 500 V (K‑bus/field)
• Bit width in process image: 16 inputs
• Weight: approx. 60 g
• Operating temperature: -25…+60 °C
• Storage temperature: -40…+85 °C
• Relative humidity: 95 % (non‑condensing)
• Vibration/shock resistance: EN 60068‑2‑6 / EN 60068‑2‑27
• EMC immunity/emission: EN 61000‑6‑2 / EN 61000‑6‑4
• Protection rating: IP20
• Installation position: variable (see documentation)
• Connection technology: 1‑wire
• Wiring cross‑section (solid): 0.08…1.5 mm²
• Wiring cross‑section (stranded): 0.25…1.5 mm²
• Wiring cross‑section (ferrule): 0.14…0.75 mm²
• Stripping length: 8…9 mm
• Housing dimensions (W x H x D): 12 mm x 100 mm x 68 mm
• Material: Polycarbonate
• Mounting: 35 mm DIN rail (EN 60715)

Expert Review

The KL1809 delivers reliable 16‑channel input acquisition in a remarkably slim 12‑mm housing. Its 3‑ms filter effectively debounces mechanical contacts, reducing false triggers in noisy environments. The direct plug‑in technology cuts wiring time significantly. With wide temperature range and global approvals (ATEX, IECEx, DNV GL), it suits demanding industrial and hazardous area applications. The plug‑and‑play design eliminates addressing hassles – a true space‑saver for high‑density control cabinets.

Manager’s Insight

For system integrators, the KL1809 offers an excellent cost‑per‑channel ratio. Its 16 inputs per 12‑mm terminal reduce cabinet footprint by up to 40% compared to standard terminals. The common 0 V reference ground simplifies sensor wiring. The robust polycarbonate housing and wide operating temperature ensure long‑term reliability. Combined with BECKHOFF’s TwinCAT system, it provides seamless diagnostics and fast commissioning – a smart choice for scalable I/O solutions.

Applicable Devices & Scenarios

• PLC systems: BECKHOFF CX series, TwinCAT‑based controllers
• Industrial automation: conveyor lines, packaging machines, assembly stations
• Process control: valve monitoring, level switches, limit sensors
• Building automation: HVAC status, access control, lighting feedback
• Hazardous areas: ATEX/IECEx Zone 2 (II 3 G Ex nA IIC T4 Gc)
• Marine & offshore: DNV GL approved for shipboard use

Installation & Commissioning Guide

• Mounting: Snap onto 35 mm DIN rail (EN 60715) using the locking mechanism.
• Wiring: For solid wires, directly insert into spring terminals. For stranded/flexible wires, use a screwdriver to actuate the spring.
• Stripping length: 8…9 mm – ensure proper insertion depth.
• Power contacts: Connect 24 V DC and 0 V to the power contacts (passed through to adjacent terminals).
• K‑bus connection: The terminal automatically communicates with the bus coupler – no address setting required.
• LED indication: Yellow LEDs per channel show input status (logic “1” = LED on).
• Commissioning: After wiring, power up the system; the KL1809 is immediately ready for data exchange in the process image.

Maintenance & Service Convenience

• Tool‑free wiring allows quick replacement of faulty sensors.
• LED status per channel enables rapid troubleshooting without a multimeter.
• No configuration software needed – reduces commissioning time.
• Standard 12‑mm housing fits existing rail layouts.
• All terminals are accessible from the front for easy inspection.

Compatibility & System Integration

• Bus systems: K‑bus (BECKHOFF Bus Terminal system).
• Couplers: Compatible with BK series, CX series, and any K‑bus master.
• Software: TwinCAT, PLC‑based systems, or any fieldbus master supporting K‑bus.
• Voltage: 24 V DC nominal (11…30 V range).
• Isolation: 500 V between K‑bus and inputs – safe for mixed voltage areas.
• Wiring type: 1‑wire connection with common 0 V reference ground.

Certifications & Safety Standards

• CE – conforms to EU directives.
• UL – recognized for US and Canadian markets.
• ATEX – II 3 G Ex nA IIC T4 Gc (Zone 2).
• IECEx – Ex ec IIC T4 Gc (international hazardous area).
• DNV GL – approved for marine and offshore applications.
• EN 61131‑2 – compliant for type 1/3 digital inputs.
• EMC: EN 61000‑6‑2 (immunity) & EN 61000‑6‑4 (emission).

Package Contents

• 1 × BECKHOFF KL1809 Bus Terminal (16‑channel digital input).
• No additional accessories – all terminals are ready for mounting.
• Documentation leaflet (refer to BECKHOFF website for detailed manuals).

Warranty & Shipping

• Warranty: 12 months against manufacturing defects.
• Shipping: 12‑24 hours dispatch (business days).
• Carriers: FedEx, UPS, DHL – worldwide express delivery.
• Tracking number provided upon shipment.

Frequently Asked Questions (FAQ)

• What is the input voltage range?“0” = -3…+5 V; “1” = 11…30 V (type 3).
• Does the KL1809 support 2‑wire sensors?Yes, it uses 1‑wire connection with common 0 V reference.
• Can I use this in Zone 2 hazardous areas?Yes, ATEX and IECEx certified for II 3 G Ex nA IIC T4 Gc.
• Is configuration required via software?No, it is plug‑and‑play; no address or parameter setting needed.
• How many inputs can I connect?16 channels per terminal; multiple terminals can be cascaded.
• What is the filter time for input debouncing?Typ. 3.0 ms – effectively eliminates mechanical switch bounce.
• Is this compatible with third‑party PLCs?It works with any K‑bus coupler; requires BECKHOFF bus system.

Experience‑Based Buying Guide

• • For high‑density applications, choose KL1809 to save panel space.
  • If you need longer input filters, consider KL1859 (adjustable).
  • For mixed voltage inputs, check KL1819 (120 V AC) or KL1829 (230 V AC).
  • For low‑power sensors, the 3 mA input current is suitable.
  • Always verify the common 0 V reference matches your sensor wiring.
  • Use ferrules for stranded wires to ensure reliable spring connections.

KL1809 16‑Channel Input Module – BECKHOFF Bus Terminal for PLC

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