Name: ABB 07KT98 GJR5253100R0120 Advant Controller 31 Basic Unit – Series 90 CPU - MASSIVE
SKU: ABB 07KT98 GJR5253100R0120

ABB 07KT98 GJR5253100R0120 Advant Controller 31 Basic Unit – Series 90 CPU

Brand ABB

Model ABB 07KT98 GJR5253100R0120

Product Overview

The ABB 07KT98, supplied under the complete material code GJR5253100R0120, is a basic unit CPU for the Advant Controller 31 (AC31) Series 90 automation platform, representing ABB’s flagship compact controller within the Advant OCS family. Designed as an intelligent, decentralized automation processor, the 07KT98 combines onboard I/O, generous memory capacity, and multi-protocol communication interfaces in a single housing, allowing it to run complete control applications without external expansion for small to mid-size installations. It forms part of ABB’s wider Procontic CS31 architecture, which emphasises simplified wiring and distributed control across machine and process environments.

At the core of the ABB 07KT98 lies 1 MB of user program memory, paired with 1 MB of user data memory, 256 kB of battery-backed RETAIN storage, and 128 kB of Flash EPROM — a configuration that dwarfs the earlier 07KT97 variant and comfortably accommodates large, complex control logic written to the IEC 61131-3 programming standard. The unit integrates 24 digital inputs and 8 analog inputs directly on board, together with two serial interfaces (COM1 and COM2) that can be configured for Modbus operation, programming, or testing, while an onboard Ethernet interface supports plant-network integration through a high-speed dual-port memory architecture. Expandable I/O is available through the CS31 fieldbus for decentralised stations.

Positioned as the high-memory workhorse of the AC31 Series 90 family, the GJR5253100R0120 occupies a distinct role in the automation estate: it is compact enough to mount on a standard TS 35 DIN rail inside a control cabinet, yet powerful enough to act as the primary controller in pump stations, conveyor systems, substation automation, water treatment units, and general manufacturing lines. Because the AC31 platform was deployed extensively worldwide over a long production life, the 07KT98 remains a critical spare for the substantial installed base still in operation, dropping into existing cabinets with no rewiring and no program conversion. For maintenance teams supporting legacy ABB installations, holding a verified 07KT98 in stock translates directly into restored uptime within minutes of a fault.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	07KT98
Material Code	GJR5253100R0120
Manufacturer	ABB
Product Type	Advant Controller 31 Basic Unit (CPU / PLC)
System Platform	Advant Controller 31 Series 90 / Procontic CS31
User Program Memory	1 MB
User Data Memory	1 MB, plus 256 kB RETAIN and 128 kB Flash EPROM
Onboard I/O	24 digital inputs, 8 analog inputs
Communication Interfaces	COM1 and COM2 serial (RS-485, Modbus-capable), H1 Ethernet, CS31 fieldbus
Programming Software	907 AC 1131 (IEC 61131-3 compliant)
Supply Voltage	24 V DC
Mounting	TS 35 DIN rail (control cabinet installation)
Memory Expansion	07 MC 90 SmartMedia Card slot (2 MB or 8 MB)
I/O Expansion	CS31 decentralised I/O stations via dedicated fieldbus interface

Main Features and Advantages

Memory capacity is the headline differentiator of the ABB 07KT98. Where the sibling 07KT97 controller offers 480 kB of user program memory, the 07KT98 provides a full 1 MB for the application logic plus an equal 1 MB for user data, together with 256 kB of battery-backed RETAIN storage for process values that must survive power interruptions and 128 kB of Flash EPROM for non-volatile firmware and configuration. For integrators programming in IEC 61131-3 languages via the 907 AC 1131 toolchain, this headroom means complex sequences, PID loops, recipe handling, and diagnostics can be implemented without the memory pressure that constrains smaller AC31 CPUs. A dedicated SmartMedia Card slot accepts the 07 MC 90 card in 2 MB or 8 MB capacities, enabling fast project backup and program transfer without a laptop on site.

Communication flexibility is another core strength of the GJR5253100R0120. The two onboard serial interfaces, COM1 and COM2, are fully configurable and can carry Modbus master or slave traffic for integration with third-party devices, while also serving as the programming and commissioning ports during engineering sessions. The built-in H1 Ethernet interface — implemented as an intelligent 100-Base-T coupler with a dual-port memory user interface — connects the controller to plant-level TCP/IP networks for supervisory integration, SCADA connectivity, and remote diagnostics. For decentralised I/O expansion, the CS31 fieldbus interface links the 07KT98 to remote I/O stations over the proven CS31 protocol, keeping the field wiring local to the process and reducing cabinet cable runs.

Integrated onboard I/O rounds out the value proposition. With 24 digital inputs and 8 analog inputs resident on the base unit, small applications run standalone without any expansion modules, while larger applications scale through CS31 I/O stations as required. Mounting on a standard TS 35 DIN rail keeps the 07KT98 footprint compact inside control cabinets, and the wide availability of tested surplus stock means the platform can be supported economically long after the original OEM production run ended — a decisive factor for plant teams protecting legacy AC31 investments.

Application Field

The ABB 07KT98 is deployed wherever the Advant Controller 31 Series 90 platform has been installed as the core control engine. In water and wastewater treatment, the 07KT98 runs pump sequencing, level-based basin control, dosing logic, and valve automation at lifting stations, filtration stages, and distribution heads, where its onboard digital and analog I/O often covers the full application without expansion. The 256 kB RETAIN memory preserves setpoints and counters across power dips, which is essential in unmanned pump stations where process state must survive brief supply interruptions.

In manufacturing and material handling, the GJR5253100R0120 controls conveyor systems, packaging lines, palletisers, and machine cells, coordinating digital I/O for motors and actuators with analog signals from pressure, temperature, and position sensors. Its H1 Ethernet interface makes it a natural fit for plants integrating AC31 islands into higher-level MES or SCADA environments via TCP/IP. Chemical and petrochemical sites use the 07KT98 for unit-level control of utility skids, tank farms, and auxiliary systems where Modbus communication with meters, analysers, and independent packages is required over COM1 or COM2.

The controller is also firmly established in building and facility automation — HVAC plant control, chiller sequencing, boiler management — and in substation and energy distribution automation, where the CS31 fieldbus links the 07KT98 to remote I/O around the installation with minimal wiring. Across every one of these industries, the persistent operational problem the ABB 07KT98 solves is continuity: it keeps mature AC31 installations running with original-specification hardware, preserving existing programs, commissioning data, operator familiarity, and cabinet layouts rather than forcing a disruptive migration. For plants balancing reliability, budget, and engineering resources, retaining the 07KT98 in the installed base is often the lowest-risk and most cost-effective path.