Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 07KR31 (FPR3600227R1202) |
| Manufacturer | ABB (formerly BBC Brown Boveri) |
| Product Type | Procontic CS31 Central Processing Unit (CPU) |
| User Program Memory | 2K words EEPROM |
| Digital Inputs | 12 × 24VDC |
| Relay Outputs | 8 × 2A |
| Power Supply Options | 24VDC / 120VAC / 230VAC |
| Communication Ports | 1 × Programmable RS232 (COM1), 1 × RS485 CS31 System Bus |
| High-Speed Counter | 1 channel, 10kHz maximum |
| Real-Time Clock | Built-in |
| Communication Protocol | MODBUS Master/Slave built-in |
| Battery Backup | Lithium battery, 10-year life (RAM content) |
| Programming Standard | IEC 61131-3 (Instruction List, FBD, Ladder) |
| Programming Tools | 907 PC 331, TCZ handheld terminal |
| Mounting Method | Plug-in base ECZ, DIN rail or screw-mounted |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -40°C to +70°C |
| Protection Rating | IP20 (for installation inside control cabinet) |
| System Expansion | Max 192 binary signals & 96 analog signals per station |
| Bus Extension | Up to 2km via bus amplifier |
| Certifications | CE, UL (ABB industrial standards) |
| Series Compatibility | ABB Procontic CS31, K200/P300 controllers |
Main Features and Advantages
Integrated I/O architecture:The ABB 07KR31 integrates 12 digital inputs and 8 relay outputs directly on the CPU module, providing a complete control solution for small to medium automation tasks without requiring additional I/O modules. This all-in-one design significantly reduces cabinet space, wiring complexity, and total system cost. The 2A relay contacts are capable of directly switching motors, solenoid valves, and indicator lamps, making the ABB 07KR31 exceptionally versatile for standalone control applications.Flexible dual serial communication:The ABB 07KR31 features a programmable RS232 port (COM1) that can be configured as a programming interface, ASCII interface for connecting peripherals (such as MMC devices), or a MODBUS interface. The RS485 CS31 system bus port enables the ABB 07KR31 to act as a master or slave on the distributed network, communicating with remote I/O units over twisted-pair wiring. Native MODBUS master/slave protocol support ensures seamless integration with third-party HMIs, SCADA systems, and intelligent field devices.Powerful processing and timing capabilities:Equipped with a 10kHz high-speed counter, the ABB 07KR31 captures fast pulse signals for flow metering, position tracking, and motion control applications. The built-in real-time clock enables timestamped event logging, scheduled operations, and time-based control logic. With 2K words of EEPROM program memory, the ABB 07KR31 retains user programs without battery dependency, while the lithium backup battery preserves RAM-resident data for up to 10 years, ensuring program integrity during power interruptions.Distributed control and cost reduction:The ABB 07KR31 serves as the master controller in CS31 decentralized architectures, where remote I/O units can be installed near sensors and actuators rather than in a central cabinet. This distributed topology reduces wiring costs by up to 80% and extends communication distances to 2km via bus amplifiers. Each station supports up to 192 binary signals and 96 analog signals, making the ABB 07KR31 scalable for growing automation requirements.
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