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KUKA KR C4: The Power of Control

The KR C4 control system is efficient and flexible and reduces your long-term costs. Automation becomes powerful and easy.


The all-rounder KR C4.

The KR C4 controller is a pioneer for the automation of today and tomorrow. It reduces costs in integration, maintenance and servicing. At the same time, the long-term efficiency and flexibility of the systems are increased – thanks to common, open industry standards.

The KR C4 software architecture integrates Robot Control, PLC Control, Motion Control (for example KUKA.CNC) and Safety Control. All controllers share a database and infrastructure. This makes automation simpler and more powerful – today and in the future.

The KUKA KR C4 controller ensures simple and powerful automation.

This is how the KR C4 controller works:

Discover the revolutionary concept of the KUKA KR C4 controller.

Four controllers in a single system

The KR C4 concept is revolutionary. For the first time, Robot and Motion Control are seamlessly and interactively integrated with control processes for PLC, CNC and Safety. With simple and flexible robot programming via inline forms and new Spline motion programming, KR C4-based automation solutions are superior in every way. Furthermore, the KR C4 features intelligent, flexible and scalable application potential.

High-end PLC support

The high-end SoftPLC option allows full access to the entire controller I/O system and has a high runtime performance. It allows the I/O handling of the robot, a complete robot cell or line of robots. In addition, variables such as axis positions or velocities can be read and processed via function blocks.

More performance in CNC machining

The KUKA.CNC control option enables direct programming and operation of KUKA robots via G-code. It can process even the most complex programs from CAD/CAM systems and provides utmost accuracy due to CNC path planning. This hugely simplifies the integration of robots into an existing CNC environment. Thanks to the increasing number of robot-specific functions in upstream CAD/CAM systems, the robot can play a direct role in machining processes.

Fully integrated safety controller

The KR C4 seamlessly integrates the complete safety controller into the control system without proprietary hardware. Safety functions and safety-oriented communication are implemented via Ethernet-based protocols. The safety concept uses multi-core technology and enables the dual-channel operation required for safety applications.

Global compatibility with the KR C4

No matter where in the world high-performance control systems are required: KR C4 is the answer. The controller works reliably with different mains voltages and types, even in extreme cold, heat or humidity. It speaks 25 languages – including the major Asian ones – and meets all globally relevant ISO and US standards.

Superior in each and every form: the KR C4 variants

With five variants, the KR C4 can be optimally integrated into your automation environment. Requirements for stackability, protection against dust, humidity and other influences can thus be taken into account.

The KUKA KR C4 controller is available in five different variants.

Overview of all facts and figures for the KR C4:

KR C4 compact KR C4 smallsize-2 KR C4 KR C4 midsize KR C4 extended
Dimensions (HxWxD) 271 x 483 x 460 mm 615 x 580 x 540 mm 960 x 792 x 558 mm 1160 x 792 x 558 mm 1600 x 842 x 562 mm
Processor Multi-core technology Multi-core technology Multi-core technology Multi-core technology Multi-core technology
Hard drive SSD SSD SSD SSD SSD
Interface USB3.0, GbE, DVI-I USB3.0, GbE, DVI-I USB3.0, GbE, DVI-I USB3.0, GbE, DVI-I USB3.0, GbE, DVI-I
Number of axes (max.) 6+2 (with additional axis box) 6+6 (with additional axis box) 9 9 16
Mains frequency 50/60 Hz ± 1 Hz  50/60 Hz ± 1 Hz  49 to 61 Hz  49 to 61 Hz  49 to 61 Hz
Rated supply voltage  200 V to 230 V AC 3 x 380 V to 3 x 575 V AC  3 x 380 V to 3 x 575 V AC  3 x 380 V to 3 x 575 V AC
3 x 380 V to 3 x 575 V AC

Protection rating

IP20 IP54 IP54 IP54 IP54
Ambient temperature +5 °C to +45 °C
+5 °C to +45 °C
+5 °C to +45 °C
+5 °C to +45 °C
+5 °C to +45 °C
Weight 33kg 60kg 150kg 160kg 240kg