Condition:New – Open box

Core Specifications

• Model: CS 31 Central Unit

• Type Designation: 07KR31

• Power Supply: 24VDC ±10%

• Power Consumption: 5W typical

• Operating Principle: Modular process control system

Hardware Configuration

• Processor: 32-bit industrial microcontroller

• Memory Capacity:

  • Program Memory: 512KB Flash

  • Data Memory: 256KB RAM

• Cycle Time: <100ms for typical control loops

I/O Capabilities

• Base Unit I/O: None (requires expansion modules)

• Expansion Slots: Up to 8 modules (digital/analog)

• Communication Ports:

  • 1 x RS-485 (Modbus RTU)

  • 1 x proprietary fieldbus (ABB internal)

Electrical Characteristics

• Input Voltage: 20-30VDC

• Current Draw: 210mA @ 24VDC

• Isolation: 1500V AC (input to system)

• Protection: Reverse polarity protected

Environmental Specifications

• Operating Temperature: -20°C to +60°C

• Storage Temperature: -40°C to +85°C

• Relative Humidity: 5-95% (non-condensing)

• Vibration Resistance: 1g @ 10-150Hz

• Protection Class: IP20 (requires enclosure)

Mechanical Details

• Dimensions: 120 x 110 x 75mm (WxHxD)

• Weight: 450g

• Mounting: DIN rail (35mm)

• Connections: Screw terminals

Communication Protocols

• Supported Protocols:

  • Modbus RTU (standard)

  • ABB Procontrol P-bus (proprietary)

  • Optional Profibus DP module available

Programming & Configuration

• Configuration Tool: ABB Procontrol CS31 Configurator

• Programming Languages:

  • Function Block Diagram (FBD)

  • Ladder Logic (LD)

  • Structured Text (ST)

• Real-Time Clock: Battery-backed (CR2032)

Application Areas

• Process control in:

  • Chemical plants

  • Water treatment facilities

  • Power generation systems

  • Oil & gas installations

Ordering Information

• 07KR31 indicates:

  • 24VDC power supply

  • Basic central unit

  • Without I/O modules

• Accessories:

  • Expansion modules (digital/analog)

  • Communication gateways

  • Power supply modules

Certifications

• Safety: UL 508

• EMC: EN 61326-1

• Marine: DNV-GL (optional)

Installation Notes

1. Power Wiring:

   • Terminal 1: 24VDC+

   • Terminal 2: 0VDC

   • Recommended wire: 1.5mm²

2. Grounding:

   • Dedicated PE terminal

   • Max ground resistance: 10Ω

3. Expansion:

   • Modules must be added sequentially

   • Maximum cable length between units: 1m