ABB 07KT97 WT97 Central Unit Basic Unit

Product Overview

The ABB 07KT97 (also known as WT97 Basic Unit, Product IDs: GJR5253000R0160, GJR5253000R0100) is the flagship CPU module of the Advant Controller 31 (AC31) series. Engineered for large-scale distributed control systems, the 07KT97 combines massive memory capacity, extensive built-in I/O, and versatile communication options. With 480 kB user program memory and 256 kB user data memory, it handles the most complex automation logic with ease. It manages up to 31 remote CS31 bus stations, making it the backbone of demanding industrial processes worldwide.

Key Specifications

• Manufacturer: ABB
• Product IDs: GJR5253000R0160, GJR5253000R0100, GJR5253000R0276 (Ethernet-ARCNET variant)
• Product Family: Advant Controller 31 (AC31) / Advant OCS
• Type: PLC Basic Unit / Central Processing Unit
• Processor: 32-bit RISC
• User Program Memory: 480 kB (non-volatile)
• User Data Memory: 256 kB
• Bit Instruction Execution Time: 0.3 – 0.5 µs (typical)
• Digital Inputs: 24 channels, 24 V DC, with LED indicators
• Digital Outputs: 16 channels, transistor type, 24 V DC, with LED indicators
• Configurable Digital I/O: 8 channels (can function as input, output, or re-readable output)
• Analog Inputs: 8 channels, configurable (0–10 V, ±10 V, 0–20 mA, 4–20 mA, differential)
• Analog Outputs: 4 channels, configurable (±10 V, 0–20 mA, 4–20 mA)
• System Bus: CS31 (built-in master, up to 31 slave stations)
• Serial Interfaces: RS-232 / RS-485 (programming and peer-to-peer)
• Optional Communication: PROFIBUS-DP (07KT97-R0220), ARCNET (07KT97-R260), Ethernet-ARCNET (07KT97-R0276)
• Power Supply: 24 V DC (±20%)
• Power Consumption: 5 – 7 W (typical)
• Operating Temperature: 0°C to +55°C (standard); -20°C to +60°C (extended variants)
• Storage Temperature: -40°C to +75°C
• Dimensions (W × H × D): ~45 mm × 120 mm × 115 mm
• Weight: ~0.4 – 0.8 kg
• Mounting: DIN rail EN 50022-35
• Protection Rating: IP20
• Certifications: CE, UL, cULus, GL, ABS, CSA, DNV, LR, RINA, RMRS

Features & Benefits

• Massive Memory: 480 kB program + 256 kB data memory accommodates the most complex control strategies and extensive trend data logging.
• All-in-One I/O: Integrated 24 DI, 16 DO, 8 configurable DIO, 8 AI, and 4 AO eliminate the need for separate I/O modules in many applications.
• High-Speed Processing: Sub-microsecond bit instruction execution delivers real-time performance for time-critical loops.
• CS31 Bus Master: Manages up to 31 remote stations with addressing flexibility (1–61, non-sequential), enabling truly distributed architectures.
• Flexible Communication: Base unit includes serial ports; optional variants add PROFIBUS-DP, ARCNET, or Ethernet for modern network integration.
• Analog Versatility: Configurable analog channels support voltage, current, and differential signals — adaptable to any sensor or actuator type.
• Robust Diagnostics: Comprehensive LED status indicators and built-in diagnostic functions minimize downtime and simplify maintenance.

Typical Applications

• Chemical and petrochemical process control
• Oil and gas production and refining
• Power generation and distribution
• Water treatment and desalination plants
• Pulp and paper manufacturing
• Large-scale HVAC and building automation

Installation Guide

1. Mounting: Snap the 07KT97 onto a 35 mm DIN rail (EN 50022). Ensure vertical orientation with terminals at top and bottom. Allow minimum 20 mm clearance on all sides for convection cooling.
2. Power Supply: Connect 24 V DC to terminals L+ and M. The supply must be stable within ±20% tolerance. Use a regulated industrial power supply.
3. I/O Wiring:
   • Digital Inputs: Connect 24 V DC field devices to DI terminals.
   • Digital Outputs: Connect loads to DO terminals (transistor outputs, max load per channel: verify datasheet).
   • Analog I/O: Connect sensors and actuators to AI/AO terminals. Configure input/output types and ranges via software.
4. CS31 Bus Configuration: Connect the CS31 bus cable to the designated terminals. Set station addresses for remote I/O modules using their coding switches. The 07KT97 automatically polls all configured stations.
5. Communication Module Installation: If using optional communication (PROFIBUS, ARCNET, Ethernet), install the appropriate module (e.g., 07KP93, 07MK92) adjacent to the basic unit and connect via the networking interface.
6. Grounding: Connect the PE terminal and Faston earth terminal to the switchgear cabinet earth with a 6 mm² wire. Do not create earth loops.
7. Programming: Connect a PC via the RS-232 programming port. Use ABB AC31 programming software to develop, download, and debug the application.
8. Commissioning: Power on, verify all LED indicators (RUN, ERR, Supply, I/O status), perform I/O functional tests, and place the system in RUN mode.

FAQ

Q: What is the difference between 07KT97-R200 and 07KT97-R0220?
A: The -R200 is the standard base unit. The -R0220 adds a PROFIBUS-DP interface. The -R260 adds ARCNET, and the -R0276 adds Ethernet-ARCNET connectivity.

Q: How many I/O points can the 07KT97 manage in total?
A: With 31 remote CS31 stations and the built-in I/O, the 07KT97 can manage thousands of I/O points. The exact limit depends on memory usage and communication bandwidth.

Q: Can I use the analog inputs as digital inputs?
A: Yes. The 8 analog input channels can be individually configured as digital inputs when analog measurement is not required, providing additional flexibility.

Q: Is the 07KT97 suitable for safety-critical applications?
A: The 07KT97 is designed for standard industrial automation. For SIL-rated safety applications, consider ABB's AC800M High Integrity or AC500-S safety PLC platforms.

Q: What is the expected service life of the 07KT97?
A: With proper installation and maintenance, AC31 controllers have demonstrated 20+ years of continuous operation in industrial environments. The non-volatile memory retains data without battery backup.

Selection Tips

• Choose the 07KT97 when your application requires 480 kB program memory or extensive built-in analog I/O. For smaller applications, consider 07KT93 or 07KT51.
• Select the appropriate variant suffix based on required communication: -R200 (standard), -R0220 (PROFIBUS), -R260 (ARCNET), -R0276 (Ethernet).
• For MODBUS RTU connectivity, add the 07KP93 communication processor.
• For custom serial protocols, add the 07MK92 freely programmable communication module.
• When replacing a failed unit, always verify the exact model number and firmware version to ensure compatibility.
• Consider the AC500 or AC800M platforms for new installations requiring modern Ethernet, web server, or OPC UA connectivity.