ABB 07KT98 GJR5253100R4278 | Advant Controller 31 Basic Unit, AC31 CPU
ABB 07KT98 GJR5253100R4278 | Advant Controller 31 Basic Unit, AC31 CPU - Image 2
ABB 07KT98 GJR5253100R4278 | Advant Controller 31 Basic Unit, AC31 CPU - Image 3

ABB 07KT98 GJR5253100R4278 | Advant Controller 31 Basic Unit, AC31 CPU

  • Model: 07KT98
  • Order Number: GJR5253100R4278
  • Brand: ABB
  • Series: Advant Controller 31 (AC31) basic unit / CPU
  • Core Function: Central PLC controller for AC31 systems, executing logic control, analog/digital I/O processing, CS31 bus coordination, and Ethernet/serial communication.
  • Type: PLC basic unit / controller module
  • Key Specs: 24 V DC supply; integrated 24 DI / 16 DO / 8 AI / 4 AO; CS31 system bus; COM1/COM2 Modbus interfaces; Ethernet capability depending on variant; SmartMedia Card memory.
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Description

Key Technical Specifications

Parameter Detail
Product Model 07KT98
Order Number GJR5253100R4278
Manufacturer ABB
Product Family Advant Controller 31 (AC31)
Product Type Basic unit / PLC controller
Supply Voltage 24 V DC (verify on nameplate)
Digital Inputs 24 × 24 V DC, electrically isolated (3 × 8 groups)
Digital Outputs 16 × transistor outputs, electrically isolated (2 × 8 groups)
Configurable DI/DO 8 channels, electrically isolated
Analog Inputs 8 channels, configurable: 0–10 V, 0–5 V, ±10 V, ±5 V, 0–20 mA, 4–20 mA, Pt100
Analog Outputs 4 channels, configurable: 0–10 V, 0–20 mA, 4–20 mA
Communication COM1/COM2 Modbus; CS31 system bus; Ethernet depending on variant
Memory User program ~1 MB; user data ~1 MB + retain/Flash
Integrated Functions High-speed counter, real-time clock, SmartMedia Card
Protection Class IP20 (typical; verify)
Availability Status Legacy/discontinued; surplus or refurbished

 

Product Introduction

The ABB 07KT98 GJR5253100R4278 is a basic unit in the Advant Controller 31 (AC31) family. It functions as the central PLC controller, executing user logic, managing local I/O, coordinating CS31 bus modules, and communicating with upstream systems via Modbus and, in some variants, Ethernet.

This is not a DCS I/O card, network switch, or excitation controller. It is a standalone PLC CPU with integrated digital and analog I/O. In brownfield plants, 07KT98 modules often remain in service because they already control critical processes, and replacing them requires full program migration and I/O revalidation.

The 07KT98 family is confusing because several order numbers share the same “07KT98” label. GJR5253100R4278 should be treated as a distinct variant. Some related suffixes add or change Ethernet capability, I/O counts, or firmware features. Do not assume interchangeability based only on the “07KT98” model name.

QA/QC Transparency SOP

  1. Order Number Verification: Confirm “07KT98” and full order number GJR5253100R4278 on the nameplate. Record hardware revision and serial number.
  2. Physical Inspection: Check housing, terminal blocks, CS31 connectors, Ethernet/serial ports, SmartMedia Card slot, and signs of overheating or corrosion.
  3. Power-Up Test: Apply 24 V DC and verify normal boot, RUN/ERR LEDs, and real-time clock behavior.
  4. I/O Verification: Confirm recognition of digital and analog channels. Test a subset of DI/DO and AI/AO points if a safe test setup is available.
  5. Communication Check: Verify CS31 bus status, COM1/COM2 Modbus response, and Ethernet availability if the variant supports it.
  6. Program & Firmware Preservation: Read and back up the existing user program, parameters, and firmware version before any replacement. Reset only if authorized.

 

Field Engineer Gotchas

  • Suffix matters. GJR5253100R4278 is not automatically interchangeable with GJR5253100R0278, R0270, R0260, or R028 variants.
  • Ethernet is variant-dependent. Some 07KT98 units include Ethernet; others rely on CS31 and serial Modbus only.
  • Not a pure I/O module. It is a controller with integrated I/O. Replacing it requires program, firmware, and parameter verification.
  • CS31 bus configuration must match. Slave addresses, data maps, and bus termination must be consistent with the existing system.
  • SmartMedia Card content is critical. The card may hold the operating system, user program, or configuration data.
  • Third-party listings are inconsistent. Some sources misdescribe 07KT98 variants as pure analog modules or temperature modules. Treat those claims with caution unless confirmed by the nameplate.
ABB 07KT98 GJR5253100R4278

ABB 07KT98 GJR5253100R4278

Application Scenarios

  • Legacy AC31 system maintenance. Replaces failed 07KT98 basic units in existing Advant Controller 31 racks.
  • Small-to-medium standalone control. Uses integrated DI/DO/AI/AO to avoid additional I/O modules.
  • Acts as the master controller for bus modules.
  • Brownfield communication integration. Connects to Modbus devices or Ethernet networks depending on the installed variant.

 

FAQ

What is ABB 07KT98 GJR5253100R4278?
It is an Advant Controller 31 (AC31) basic unit / PLC controller with integrated digital and analog I/O.

Is it a DCS I/O card?
No. It is a PLC controller that also provides local I/O.

Can I replace it with any 07KT98 module?
No. The full order number, firmware, I/O configuration, and communication features must match.

Does it support Ethernet?
Some 07KT98 variants do; others do not. Confirm on the physical unit.

What memory does it use?
It supports SmartMedia Card memory for the operating system, user program, and user data.

Is it still in production?
Expect surplus or refurbished availability. Verify condition, firmware, and program backup before deployment.

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