Description
Interfacing sixteen 24V DC binary control signals with the central K-bus backplane, the Beckhoff KM1012-0001 compact bus terminal module features a high-density 1-wire pluggable connection interface designed for space-optimized control cabinets. This unit transmits electrically isolated digital inputs directly to the higher-level automation controller, matching the integration workflow of standard Beckhoff K-bus terminal blocks. By incorporating sixteen distinct input channels across two plug-in connectors, this module significantly reduces the required DIN rail footprint while maintaining signal integrity under heavy electromagnetic interference.
Key Features
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High-Density Architecture: Combines 16 digital input channels in a compact 26.5 mm housing, dividing signals into two 8-channel pluggable connector blocks.
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Efficient Signal Processing: Hardware-implemented input filter of typically 0.2 ms prevents contact bounce issues and ensures rapid processing.
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Pluggable Wiring Level: Shipped with a pre-configured 1-wire plug-in connector interface, allowing rapid module replacement during maintenance cycles.
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Electrical Isolation: Complete 500 V optocoupler isolation between the internal K-bus electronics and the field potential.
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Low Internal Draw: Draws only 3 mA typical from the internal K-bus supply, minimizing overall cabinet thermal loading.
Industrial Applications
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Machine Tool Automation: Monitoring limit switches, proximity sensors, and basic pushbuttons.
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Packaging and Material Handling: Processing high-volume sensor arrays along conveyor tracks.
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Modular Assembly Stations: Space-restricted control panels requiring dense digital sensor integration.
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HVAC and Building Controls: Consolidating binary auxiliary contacts and alarm relays into centralized PLC racks.
KM1012 Series Variant Directory
| Order Code |
Wiring Configuration |
Status LED Indication |
Connector Status |
| KM1012-0000 |
1-wire system |
No |
Not included (Base module only) |
| KM1012-0001 |
1-wire system |
No |
1-wire plug connector included |
| KM1012-0002 |
1-wire system |
Yes (Integrated LEDs) |
1-wire plug connector with LEDs included |
| KM1012-0004 |
3-wire system |
Yes (Integrated LEDs) |
3-wire plug connector with LEDs included |
Technical Specifications
| Manufacturer |
Beckhoff Automation GmbH & Co. KG |
| Country of Origin |
Germany |
| Number of Inputs |
16 (divided into 2 x 8-channel groups) |
| Nominal Supply Voltage |
24 V DC (-15% / +20%) |
| Signal Voltage (0-state) |
-3 V DC to +5 V DC (EN 61131-2, Type 1) |
| Signal Voltage (1-state) |
15 V DC to 30 V DC (EN 61131-2, Type 1) |
| Input Filter Time |
Typically 0.2 ms |
| Input Nominal Current |
Typically 5 mA |
| Current Draw (K-bus) |
Typically 3 mA |
| Current Draw (Power Contacts) |
None (unconnected) |
| Isolation Voltage |
500 V RMS (K-bus to field potential) |
| Process Image Bit Width |
16 inputs |
| Connection Technology |
Pluggable connection level, 1-wire system |
| Conductor Cross-Section |
0.08 mm to 1.5 mm (Solid or stranded wire) |
| Wire Stripping Length |
8 mm |
| Dimensions (W x H x D) |
26.5 mm x 100 mm x 71 mm |
| Operating Temperature Range |
0 degC to +55 degC |
| Storage Temperature Range |
-25 degC to +85 degC |
| Relative Humidity Range |
95%, non-condensing |
| Environmental Standards |
Conforms to EN 60068-2-6 / EN 60068-2-27 (Vibration/Shock) |
| Protection Class |
IP20 (with variable installation positioning) |
| Certifications |
CE |
| Shipping Weight (Calculated) |
0.25 kg |
| Package Dimensions (Calculated) |
120 mm x 80 mm x 40 mm |
Connector Pin Assignment
| Terminal / Pin |
Group Allocation |
Function / Signal Description |
| Connector 1 (Pins 1 - 8) |
Input Group A |
Digital Inputs 1 through 8 (Standard 24 V DC) |
| Connector 2 (Pins 1 - 8) |
Input Group B |
Digital Inputs 9 through 16 (Standard 24 V DC) |
Empirical Engineering Insights
Alternative Models & Compatibility
The KM1012-0001 ships standard with a 1-wire connection plug-in system. It is fully backwards compatible and interchangeable in TwinCAT configurations with the base model (KM1012-0000) once the corresponding physical plug is connected. If status feedback is required directly on the terminal face, consider upgrading to the KM1012-0002 model, which shares the identical process image and footprint but incorporates inline diagnostic LEDs.
Application Pitfalls & Engineering Notes
Because this module utilizes a high-density 1-wire connection scheme, there are no onboard power contacts for sensor supply routing. To connect passive 2-wire or 3-wire field sensors, external potential distribution terminals (such as the Beckhoff KL9184 or KL9187) must be integrated onto the rail. Failing to provide a common ground return to the sensor supply rail will cause floating inputs and intermittent state changes.
Commissioning & Wiring Tips
When stripping sensor wires, ensure a strict stripping length of 8 mm. Shorter stripping lengths will lead to unreliable connection clamp contacts, triggering sporadic input dropouts, whereas excessively stripped cables pose short-circuit risks in dense plug arrays. Always verify that the plug-in connector is securely latched into the terminal base housing before powering up the K-bus rail.
Installation Guidelines
CRITICAL WARNING:
De-energize all primary field power and K-bus backplane power supplies before installing, removing, or wiring the module. Working on live equipment risks critical damage to the backplane communication ICs and may lead to unpredictable system states.
1
Align the module side-by-side with other Bus Terminals on a standard 35 mm DIN rail (EN 60715), utilizing the integrated double slot and key connection system.
2
Push the module back onto the DIN rail until the lock mechanisms on both top and bottom securely click into position.
3
Wire the 1-wire plug-in connector using solid or stranded wires (0.08 to 1.5 mm²), maintaining an exact stripping length of 8 mm.
4
Insert the pre-wired connector assembly firmly into the terminal face of the module until the side-retaining tabs lock cleanly.