Application Scenarios
Consider a 25-year-old chemical processing facility where the original AC31 controller has been orchestrating reactor temperature control, distillation column monitoring, and safety interlocking for decades. Suddenly, the plant engineer discovers that the existing basic unit lacks Ethernet connectivity, making it impossible to integrate with the new plant-wide SCADA system. A full DCS replacement would cost millions and require months of downtime. Instead, the maintenance team specifies the 07KT98 GJR5253100R0278 as a direct functional upgrade.
Because the 07KT98 maintains full backward compatibility with the AC31 I/O ecosystem — including the same CS31 system bus, identical programming model under 907 AC 1131, and the same physical footprint — the transition is seamless. The built-in Ethernet port immediately connects to the modern SCADA network, while the integrated CANopen master interface links to intelligent field devices such as variable frequency drives and motor starters. The 24 digital inputs directly acquire valve feedback and limit switch signals; the 16 transistor outputs drive contactors and solenoid valves; the 8 configurable analog inputs read 4–20 mA transmitters from pressure, flow, and temperature instruments; and the 4 analog outputs command control valves — all without adding a single expansion rack. Within a single weekend shutdown, the plant achieves Industry 4.0 connectivity while preserving its entire installed base of field wiring, I/O modules, and control logic.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 07KT98 |
| Order Number | GJR5253100R0278 |
| Alternative Designation | WT98 |
| Manufacturer | ABB |
| Product Category | Basic Unit / CPU Module |
| Series | Advant Controller 31 (AC31) / Advant OCS |
| Digital Inputs (DI) | 24 channels, 24 V DC, grouped in 3 isolated banks of 8 |
| Digital Outputs (DO) | 16 transistor outputs, 24 V DC, 0.5 A per point, short-circuit protected |
| Combined DI/DO | 8 channels, electrically isolated, individually configurable |
| Analog Inputs (AI) | 8 channels, configurable: ±10 V, ±5 V, 0–10 V, 0–5 V, 0–20 mA, 4–20 mA, Pt100 (2-/3-wire) |
| Analog Outputs (AO) | 4 channels, configurable: ±10 V, 0–20 mA, 4–20 mA |
| Communication Interfaces | Ethernet TCP/IP, CANopen master, 2 × serial (COM1/COM2 as Modbus), 1 × CS31 system bus |
| High-Speed Counter | 2 counters, up to 50 kHz, 7 configurable operating modes |
| Memory | 1 MB Flash EPROM (program + 128 kB data) + 1 MB DRAM (program/data) + 256 kB SRAM (RETAIN) |
| Real-Time Clock | Integrated, battery-backed |
| Data Backup | Lithium battery 07LE90; SmartMedia card 07MC90 for OS/program/user data |
| Power Supply | 24 V DC (±20%), typical consumption 0.55 A |
| Dimensions (W × H × D) | 240 × 140 × 85 mm |
| Weight | 1.6 kg |
| Mounting Method | 35 mm DIN rail (DIN EN 50022-35) or M4 screw panel mount |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -25 °C to +75 °C |
| Protection Rating | IP20 (cabinet interior installation) |
| Programming Software | 907 AC 1131 (V4.2.1 or higher for Ethernet+CANopen variant) |
| Country of Origin | Sweden / Germany / USA |
Key annotations: The 24 DI + 16 DO + 8 configurable DI/DO configuration delivers unparalleled integration density — eliminating the need for separate I/O modules in many mid-scale applications. The Ethernet + CANopen combination on the R0278 variant provides native connectivity to both enterprise networks and intelligent field devices. The 50 kHz high-speed counter enables precise position and flow measurement. With CS31 bus expansion to 31 remote modules, a single 07KT98 can theoretically manage up to 992 DI, 992 DO, 224 AI, and 224 AO points across the distributed system.
Technical Principles and Innovative Values
- Innovation Point 1 — Triple-Role Architecture: The 07KT98 is uniquely capable of functioning as a CS31 bus master, a remote slave processor, or a completely standalone controller. This flexibility allows system designers to deploy the same hardware SKU across different layers of a distributed automation hierarchy, drastically simplifying spare parts inventory and engineering knowledge requirements.
- Innovation Point 2 — All-in-One I/O Integration: Unlike conventional CPUs that require separate I/O modules for even basic signals, the 07KT98 integrates 48 discrete I/O points and 12 analog I/O channels directly into the basic unit. This reduces cabinet footprint, eliminates backplane communication latency between CPU and I/O, and significantly lowers total system cost for machines with moderate I/O demands.
- Innovation Point 3 — Dual Modern Fieldbus Built-In: The GJR5253100R0278 variant of the 07KT98 incorporates both Ethernet TCP/IP and CANopen master interfaces as standard. This dual-connectivity approach bridges legacy AC31 installations with modern Industry 4.0 architectures — enabling seamless SCADA integration, remote diagnostics, and connection to intelligent field devices without external communication processors.
- Innovation Point 4 — Non-Volatile Memory Hierarchy: The 07KT98 employs a three-tier memory architecture — Flash EPROM for permanent program storage, DRAM for execution, and battery-backed SRAM for RETAIN data. Combined with the removable SmartMedia card 07MC90, this design ensures zero data loss during power interruptions and enables effortless program cloning across multiple controllers in a fleet.
- Innovation Point 5 — Comprehensive Onboard Diagnostics: Sixty LED indicators on the 07KT98 front panel provide real-time visualization of every I/O channel state, communication status, and error condition. Coupled with extensive self-diagnostic routines covering the basic unit, CS31 bus, and connected modules, this feature reduces mean-time-to-repair (MTTR) from hours to minutes — a critical advantage in continuous-process industries where every minute of downtime carries enormous cost.
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