✅ General Information

• Full Type: 07KR51 – AC31 Programmable Controller, 8DI/6DO Relay

• Manufacturer: ABB (France/Sweden)

• Weight: approx. 0.29–0.5 kg

• Dimensions (W×H×D): 65 × 93 × 85 mm

• Mounting: DIN rail (TH35)

• Protection: IP20

✅ Memory & Performance

• User Program Memory: 34 kB Flash EPROM

• User Data Memory: 4.4 kB non‑volatile RAM

• Processor: 16‑bit microprocessor

• Execution Speed: 1 ms per typical instruction

✅ Integrated I/O

• Digital Inputs (DI): 8 channels, 24 VDC, sink/source selectable

• Digital Outputs (DO): 6 channels, relay contacts (NO/NC)

• Relay Rating: 250 VAC / 2 A (resistive load)

• Input Filter: Hardware debounce, configurable delay

• Isolation: Galvanic isolation between field and system

✅ Communication Interfaces

• RS232: 1 port (programming, HMI, Modbus RTU, ASCII)

• RS485: 1 port (optional, multi‑drop network)

• Protocols: Modbus RTU, ASCII, ABB proprietary

✅ Electrical Ratings

• Supply Voltage: 24 VDC (18–30 VDC) or 120/230 VAC (version dependent)

• Current Consumption: < 200 mA @ 24 VDC

• Power Dissipation: < 5 W

✅ Environmental

• Operating Temperature: 0 °C … +55 °C

• Storage Temperature: −40 °C … +75 °C

• Humidity: 10%–90% non‑condensing

• Certifications: CE, UL, RoHS

✅ Key Features

• All‑in‑one PLC: CPU + 8DI + 6DO (relay), no extra I/O needed

• Compact & low power: Ideal for space‑limited cabinets

• Modbus RTU capable: Connects to drives, meters, RTUs

• LED status indicators: Power, Run, Fault, I/O state

• System Compatibility: ABB Advant Controller 31, Advant OCS, 800xA (remote/local controller)

✅ Applications

• Small/medium machine control, assembly lines, building automation

• Temperature/pressure/flow/level process control

• Relay‑logic replacement, interlocks, alarm systems

• Legacy system upgrades (replacing older AC31 controllers)