ABB 07 KT 93-S: A Practical Central Unit for Demanding Control Tasks
When a legacy control cabinet loses its central processing unit, production stops and every hour of downtime cuts into margin. The ABB 07 KT 93-S central unit is built for exactly that reality: a compact controller that keeps discrete and analog processes running without a full system overhaul. It combines integral I/O, field bus communication, and safety-oriented control in one withdrawable module.
What the 07 KT 93-S Brings to the Panel
The unit ships with 24 DI and 16 DO on board, so basic machine signals do not need extra I/O cards. When the application grows, the system scales to a maximum of 1032 DI/DO and 192 AI/AO. Program memory is 56 kByte Flash EPROM and RAM, supported by 4096 bits, 4096 words (16 bit), and 512 double words (32 bit) of data memory. A cycle time of 0.7 ms per Kbyte keeps scan performance predictable on fast lines.
Technical Specifications
| Specification | Value |
|---|---|
| Communication | Includes CS 31 – Field bus |
| Program Memory | 56 kByte Flash EPROM and RAM |
| Data Memory | 4096 bits, 4096 words (16 bit), 512 double words (32 bit) |
| Variables | 128 variables |
| Cycle Time | 0.7 ms per 1 Kbyte |
| Integral I/O | 24 DI and 16 DO |
| Maximum DI/DO | 1032 in total |
| Maximum AI/AO | 192 AI / AO |
| Programming System | 907PC331 |
| Program Execution | 1 Task |
| Fast Counters | 1 (10 kHz) |
| Timers | Restricted (80 simultaneously) |
| Counters | Unrestricted |
| Special Functions | Safety-oriented control up to AK4 (DIN V 19250) and category 3 (EN 954); PDNet, MODBUS; PI and PID controllers; ASCII communication |
| Hardware Details | Password protection, exchangeable battery, real-time clock, withdrawable terminal blocks with screw terminals, mounting with or without DIN rail |
Solving Real Engineering Pain Points
Pain point one: mixed signal types on one machine. The 07 KT 93-S handles discrete inputs and outputs directly while supporting up to 192 analog channels. That means a single central unit can manage start/stop logic, temperature loops, and position feedback without adding separate analog racks.
Pain point two: safety without a separate safety PLC. For applications that need more than standard control, this unit supports safety-oriented programming up to AK4 (DIN V 19250) and category 3 (EN 954). Engineers can integrate safety functions into the same architecture, which simplifies panel space and wiring.
Pain point three: communication with existing networks. The CS 31 field bus interface, together with PDNet, MODBUS, and ASCII communication, lets the controller exchange data with drives, HMIs, and supervisory systems. If you are wiring into a plant network, confirm cable and gateway requirements with your supplier before commissioning.
Where the 07 KT 93-S Fits
Oil and gas facilities often run legacy ABB control systems that need drop-in spares. This central unit suits pump control, compressor monitoring, and safety-related shutdown logic where the existing program was written for the 907PC331 environment. Industrial automation integrators also use it for retrofit projects that require a proven controller with a real-time clock and password protection.
Installation and Maintenance Notes
Mounting is flexible: the unit installs with or without DIN rail, and withdrawable terminal blocks with screw terminals simplify field wiring. The exchangeable battery and real-time clock support time-stamped events. For maintenance, inspect terminal connections periodically and follow the manufacturer’s safety manual for any safety-related functions. Do not attempt internal repairs on safety-rated circuits.
Integration and Compatibility
The 07 KT 93-S works within ABB’s 07 KT family and communicates over CS 31 field bus, PDNet, and MODBUS. When integrating with modern Ethernet-based systems, an external gateway or connection module may be required. Confirm the exact cables and gateways with Oil AutoTech before ordering.
Selection Checklist
Before purchasing, verify the existing program was developed for the 907PC331 programming system, confirm the required I/O count against the 1032 DI/DO and 192 AI/AO limits, and check whether your safety functions need AK4 or category 3. Oil AutoTech provides hands-on technical selection help and fast dispatch, worldwide.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Contact Oil AutoTech today for pricing and availability.
