ABB 07 KT 93 07KT93 Central Processing Unit

Product Overview

The ABB 07KT93 is a basic unit (CPU module) within the Advant Controller 31 (AC31) family. Designed for medium-complexity automation tasks, the 07KT93 offers enhanced processing power and expanded I/O capabilities compared to entry-level units like the 07KT51. It serves as the central brain of decentralized automation systems, functioning as a CS31 bus master, remote processor (slave), or standalone controller depending on application requirements.

Key Specifications

• Manufacturer: ABB
• Product Family: Advant Controller 31 (AC31)
• Type: PLC Basic Unit / CPU Module
• User Program Memory: Up to 128 kB (variant dependent)
• User Data Memory: Up to 64 kB
• Digital Inputs: 16 channels, 24 V DC
• Digital Outputs: 12 channels, transistor type, 24 V DC
• Power Supply: 24 V DC
• System Bus: CS31 (built-in master/slave capability)
• Operating Temperature: 0°C to +55°C
• Storage Temperature: -40°C to +75°C
• Mounting: DIN rail EN 50022-35 or screw mounting
• Protection Rating: IP20

Features & Benefits

• Flexible Operating Modes: Operates as bus master, remote slave, or standalone unit — adapts to any system architecture.
• Integrated I/O: 16 DI and 12 DO transistor outputs reduce the need for external I/O modules in medium-scale applications.
• CS31 Bus Master: Manages up to 31 remote I/O stations, enabling distributed control across large plant footprints.
• High-Speed Processing: Fast bit instruction execution times ensure real-time response for time-critical processes.
• Serial Communication: Built-in RS-232/RS-485 interfaces for programming, HMI connection, and peer-to-peer communication.
• Comprehensive Diagnostics: LED status indicators and built-in diagnostic functions simplify troubleshooting and maintenance.

Typical Applications

• Process control in chemical and pharmaceutical plants
• Assembly line automation and robotics
• Power generation and distribution monitoring
• Food and beverage processing
• Pump station and wastewater treatment control

Installation Guide

1. Mounting: Install on a 35 mm DIN rail (EN 50022) or secure with 4 × M4 screws. Maintain vertical orientation with terminals at top and bottom.
2. Power Supply: Connect 24 V DC to terminals L+ and M. Ensure stable power within ±20% tolerance.
3. I/O Wiring: Connect field devices to the integrated 16 DI and 12 DO terminals. Use conductors up to 2.5 mm².
4. CS31 Bus Configuration: If using decentralized I/O, connect the CS31 bus and configure station addresses (1–61) via the coding switch.
5. Serial Interface: Connect programming cable to the RS-232 port for initial configuration and program download.
6. Grounding: Connect the PE terminal to cabinet earth with a 6 mm² wire. Avoid ground loops.
7. Commissioning: Power on, verify LED status, download the application program, and perform I/O functional tests.

FAQ

Q: How does 07KT93 compare to 07KT97?
A: The 07KT93 is a mid-range unit with ~128 kB program memory and integrated digital I/O. The 07KT97 is the flagship with 480 kB program memory, 256 kB data memory, and built-in analog I/O (8 AI / 4 AO). Choose 07KT97 for larger, more complex applications.

Q: Can I expand I/O beyond the built-in channels?
A: Absolutely. Via the CS31 system bus, you can add remote I/O modules such as 07DC91, 07DC92, 07DI92, 07AC91, and 07AI91 to scale up to thousands of I/O points.

Q: What communication protocols are supported?
A: The base unit supports CS31 bus natively. Optional communication modules (07KP93 for MODBUS RTU, 07MK92 for custom serial protocols) can be added for expanded connectivity.

Q: Is the 07KT93 still manufactured by ABB?
A: The AC31 series is a mature product line. While ABB may have transitioned to newer platforms (AC500, AC800M), the 07KT93 remains widely available through authorized distributors and surplus suppliers for maintenance and legacy system support.

Selection Tips

• Select 07KT93 for medium-scale applications requiring more memory and I/O than the 07KT51 but not the full capacity of the 07KT97.
• For applications requiring analog signal processing, pair with 07AC91 (8 AI / 8 AO) or 07AI91 (8 AI with RTD/thermocouple support).
• Ensure your programming software version supports the 07KT93 firmware revision.
• When replacing a failed unit, verify the exact model suffix (e.g., 07KT93-Rxxx) to match communication and I/O configurations.
• Consider upgrading to AC500 eCo or AC500 platforms for new projects requiring modern Ethernet connectivity and web-based diagnostics.