ABB Advant OCS 07KT51 Compact PLC Basic Unit

Product Overview

The ABB 07KT51 (Product ID: 1SBP260012R1001) is a compact PLC basic unit from the Advant Controller 31 (AC31) series. Featuring 8 digital inputs and 6 transistor outputs, this entry-level controller is ideal for small automation tasks, machine control, and distributed I/O applications. With 34 kB user program memory and a 24 V DC power supply, the 07KT51 delivers ABB's legendary reliability in an economical, space-saving package.

Key Specifications

• Manufacturer: ABB
• Product ID: 1SBP260012R1001
• Catalog Description: 07 KT 51, eight 24 VDC inputs, six transistor outputs, 24 VDC input power
• Product Family: Advant Controller 31 (AC31)
• Type: PLC Basic Unit
• Digital Inputs: 8 channels, 24 V DC, 5 mA
• Digital Outputs: 6 channels, transistor type, 24 V DC
• Output Ratings: Output 0–1: 1 A each; Output 2–5: 0.5 A each; COM: 4 A total
• User Program Memory: 34 kB
• Power Supply: 24 V DC, 5W / 10W
• Operating Temperature: 0°C to +55°C
• Storage Temperature: -40°C to +75°C
• Dimensions: ~167 mm × 114 mm × 38 mm (6.5" × 4.5" × 1.5")
• Weight: ~310 g (0.31 kg)
• Mounting: DIN rail or screw mounting
• Protection Rating: IP20

Features & Benefits

• Ultra-Compact Design: At just 310 g and ~38 mm depth, the 07KT51 fits into the tightest control cabinets and machine panels.
• Integrated I/O: 8 DI and 6 DO eliminate the need for separate I/O modules in small applications, reducing wiring and component costs.
• Transistor Outputs: Fast-switching transistor outputs (up to 1 A on channels 0–1) are ideal for solenoid valves, indicators, and low-voltage coils.
• CS31 Bus Master: Built-in CS31 bus interface allows expansion to remote I/O stations for scalable system growth.
• Spring Terminal Option: Some variants feature spring-type terminals for faster, tool-free wiring.
• Low Power Consumption: Typical power draw of only 5W makes it ideal for battery-backed or energy-efficient installations.

Typical Applications

• Small machine control and sequencing
• Conveyor and sorting systems
• Pump and fan control
• Lighting and HVAC zone control
• Standalone process monitoring stations

Installation Guide

1. Mounting: Snap onto a 35 mm DIN rail (EN 50022) or fasten with 4 × M4 screws. The lightweight design (310 g) allows flexible mounting positions.
2. Power Supply: Connect 24 V DC to the L+ and M terminals. Ensure the supply can deliver at least 10W peak.
3. Input Wiring: Connect 24 V DC sensors and switches to the 8 DI terminals. Input current is approximately 5 mA per channel.
4. Output Wiring: Connect loads to the 6 DO terminals. Note that outputs 0 and 1 support up to 1 A each, while outputs 2–5 support 0.5 A each. Total COM current: 4 A.
5. CS31 Bus: If expanding with remote I/O, connect the CS31 bus cable and configure slave station addresses.
6. Programming: Connect a PC via the serial interface and use ABB AC31 programming software to develop and download the application.
7. Torque: Tighten terminal screws to 0.5–0.6 Nm (4.5 lbs-inch) using AWG14 Cu stranded wire.

FAQ

Q: What is the difference between 07KT51 and 07KR51?
A: The 07KT51 has transistor outputs (faster switching, DC only), while the 07KR51 has relay outputs (AC/DC compatible, slower switching). Choose based on your load requirements.

Q: Can I add analog I/O to the 07KT51?
A: Yes, via the CS31 system bus, you can add 07AC91 (analog I/O) or 07AI91 (analog input with RTD/thermocouple) modules.

Q: What is the maximum number of remote I/O stations?
A: The 07KT51 can manage up to 31 remote CS31 stations, allowing significant system expansion.

Q: Are there different variants of 07KT51?
A: Yes, variants include 07KT51-W3.9, 07KT51-U3.6, 07KT51-R3.3, and others with different terminal types, I/O configurations, or firmware features. Verify the exact suffix for your application.

Selection Tips

• The 07KT51 is the most economical AC31 basic unit — ideal for cost-sensitive small applications.
• For AC load switching, select the 07KR51 (relay outputs) instead.
• For applications requiring more memory or built-in analog I/O, step up to 07KT93 or 07KT97.
• Check the terminal type (screw vs. spring) when ordering to match your wiring preferences.
• When replacing a unit, verify the exact model suffix to ensure identical I/O behavior and terminal compatibility.