Introduction
When your automation system demands precise control and reliable I/O handling, the ABB 07 KT 97 central unit delivers. This terminal blocks-based controller integrates 24 digital inputs, 16 digital transistor outputs, 8 configurable digital inputs/outputs, 8 analog inputs, and 4 analog outputs. Designed for demanding industrial environments, it provides a robust foundation for machine control, process monitoring, and system integration.
Technical Specifications Breakdown
The 07 KT 97 offers a comprehensive set of I/O and processing capabilities. Key parameters include:
- Digital Inputs: 24 channels arranged in three groups of eight, each with optocoupler isolation. Input signal voltage for logic 0 is -30 V to +5 V, and for logic 1 is +13 V to +30 V. Typical input current at 24 V is 7.0 mA.
- Digital Outputs: 16 transistor outputs in two groups of eight, rated at 500 mA per channel (maximum 625 mA at 24 V + 25%). Total load per common supply is max. 4 A. Outputs are short-circuit proof and protected against reversed polarity.
- Analog Inputs: 8 channels configurable for voltage (0...10 V, 0...5 V, ±10 V, ±5 V), current (0...20 mA, 4...20 mA), Pt100 (-50...+400°C and -50...+70°C), or digital input. Input impedance for voltage input is >100 kΩ.
- Analog Outputs: 4 channels.
- Processing Performance: Typical cycle time is 0.3 ms per kB of program (65% bits, 35% words).
- Memory: Integrated Flash EPROM 512 kB (480 kB program + configuration data) and RAM 2 MB (480 kB program with online programming + 256 kB variables).
- High-Speed Counter: One integrated counter with 7 operating modes, counting range -32768...+32767 (16-bit signed integer), and max. counting frequency of 50 kHz.
- Real-Time Clock: Resolution of 1 second.
- Power Supply: Rated 24 V DC, max. current consumption 0.35 A, with reversed polarity protection.
Industry Applications
Machine Control
In packaging or assembly lines, the 07 KT 97 handles high-speed counting (up to 50 kHz) for precise position or product counting. Its 24 digital inputs and 16 outputs manage sensors and actuators, while the analog inputs monitor temperature via Pt100 or pressure via 4-20 mA transmitters. The configurable digital I/O adds flexibility for custom interlocks.
Process Monitoring
For chemical or water treatment plants, the 8 analog inputs (0...20 mA, 4...20 mA) interface with field transmitters. The real-time clock (1-second resolution) logs events accurately. The CS31 system bus allows expansion up to 992 digital inputs and 224 analog input channels, scaling with your process.
Installation & Setup Guidance
Mount the 07 KT 97 on a DIN rail or directly using its mounting provisions. Use removable screw-type terminal blocks for wiring. For power supply, use a 24 V DC source rated for at least 0.35 A. Observe the wiring guidelines:
- CS31 system bus terminals: max. 1 x 2.5 mm² or 2 x 1.5 mm².
- All other terminals: max. 1 x 1.5 mm².
Ensure proper grounding and follow the electrical isolation specifications between I/O groups. For shielded cables, maximum length is 1000 m for digital inputs; for unshielded, 600 m. Digital outputs have a maximum cable length of 400 m (consider voltage drops).
Maintenance & Reliability
Regularly inspect the lithium battery (module 07 LE 90) that backs up RAM contents; typical lifetime at 25°C is 5 years. Check all terminal connections for tightness. The unit has 60 LEDs for status indication: one green LED per digital input channel, one yellow LED per digital output channel, and one yellow LED per digital I/O channel. Monitor these for quick diagnostics. The outputs are short-circuit and overload proof, reducing downtime.
Compatibility & Integration
The 07 KT 97 integrates via the CS31 system bus, supporting up to 31 remote modules. It includes two serial interfaces (for programming or man-machine communication) and one parallel interface for a communication processor (for networking with other bus systems). It supports protocols such as Profibus DP, ARCNET, and MODBUS. The programming system is 907AC1131, enabling cyclic, time-controlled multitasking (20 tasks).
Selection Guide & Purchasing Advice
Before ordering the 07 KT 97, verify your system voltage (24 V DC) and I/O requirements. The unit is supplied with removable screw terminal blocks. For battery backup, order the 07 LE 90 battery module separately. SpareTechPLC stocks this central unit and can advise on compatible expansion modules and accessories. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Frequently Asked Questions
Q: What is the maximum counting frequency of the high-speed counter?
A: The integrated high-speed counter operates at a maximum counting frequency of 50 kHz.
Q: How many analog input channels does the 07 KT 97 have?
A: It has 8 analog input channels, configurable for voltage, current, Pt100, or digital input.
Q: Can the digital outputs drive inductive loads?
A: Yes, the outputs have internal varistor demagnetization for inductive loads, with a maximum switching frequency of 0.5 Hz.
Q: What is the typical processing time for 1 kB of program?
A: The typical processing time is 0.3 ms for 1 kB of program (65% bits, 35% words).
Q: How do I expand I/O beyond the integral 24 inputs and 16 outputs?
A: Use the CS31 system bus to connect up to 31 remote modules, achieving up to 992 digital inputs and 224 analog input channels.
