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ABB 07KR51

07KR51 is a compact CPU controller belonging to ABB AC31 / Advant distributed PLC system. It is an integrated all-in-one controller unit with built-in digital input channels and relay output channels. It supports CS31 fieldbus expansion, and can work as a standalone small PLC or as a slave control node in distributed automation systems. It executes user logic programs, collects field discrete signals, drives relay outputs and communicates with upper control system. It is widely used for small and medium logic control tasks in industrial automation.

Technical Parameters

• Model: 07KR51
• Product ID: 1SBP260511R1001
• Series: AC31 / Advant Controller 31
• Power supply: 120 / 230 V AC
• Digital Input: 8 channels, 24 V DC
• Digital Output: 6 relay output channels, rated 2 A per channel, up to 230 V AC/DC
• Program memory: 34 kB
• Built-in real-time clock: Supported
• Hardware counter: 2 pcs
• Bus interface: CS31 fieldbus for I/O expansion
• Operating temperature: 0°C ~ +55°C
• Storage temperature: -40°C ~ +75°C
• Protection class: IP20
• Mounting: DIN rail mounting
• Weight: Approx. 0.29 kg
• Origin: France
• Certifications: CE

Product Features

1. All-in-one compact design integrating CPU, DI and relay DO, eliminating the need for separate I/O modules for small control applications.
2. Equipped with CS31 bus interface, supporting external expansion of additional I/O modules to expand control scale.
3. Relay output supports AC and DC loads, strong load driving capability and wide adaptability for field actuators.
4. Built-in real-time clock and hardware counters, convenient for timing and pulse counting control.
5. Supports AC31GRAPH programming software, easy program editing, download and online debugging.
6. Module self-diagnosis function, detecting power failure, program error and internal fault with LED status indication.
7. DIN rail installation, compact dimension, saving cabinet installation space.
8. High anti-interference design, stable operation in factory automation environments.

Structural Composition

1. CPU core unit: Executes user control logic, program storage and data processing.
2. Digital input circuit: Opto-isolated input channels for collecting 24V DC field switch signals.
3. Relay output unit: Electromagnetic relay modules to switch external load circuits.
4. CS31 bus communication circuit: Data exchange with extended remote I/O modules.
5. Power conversion unit: Converts 120/230V AC input to internal working voltage for controller and circuits.
6. Real-time clock & counter module: Provides timing function and high-speed pulse counting.
7. Status indicator LED: Displays power, running status and fault alarms.
8. Terminal block and plastic housing: Wiring interface and mechanical protection, DIN rail buckle for installation.

Application Fields

• Small process control in chemical plants
• Water treatment and pump station logic control
• Packaging machinery and material handling equipment
• HVAC and building industrial automation
• Auxiliary control system of power plants
• Metallurgy auxiliary equipment control
• Marine and offshore platform auxiliary automation
• General factory discrete production line control

Conclusion

ABB 07KR51 is an integrated compact controller of AC31 series. It combines CPU, digital input and relay output, and supports CS31 bus expansion. With reliable relay output, built-in clock and counter functions, it is suitable for small and medium-sized discrete logic control. It features simple programming, easy installation and stable performance, serving as a cost-effective control unit for distributed industrial automation and local machine control.