Description
The ABB GJR5253100R0260 (Catalog Designation: 07KT98) is a powerful, legacy programmable logic controller (PLC) serving as a standalone or master/slave basic unit within the Advant Controller 31 (AC31) decentralized automation network. It integrates processing logic, multi-protocol serial communication channels, and high-density onboard digital and analog I/O within a single compact chassis.
Commercial Availability & Procurement
- Condition: New Surplus (Factory Sealed) or Refurbished (Fully Bench-Tested)
- Warranty: 12-Month Comprehensive Technical Warranty
- Lead Time: Ships within 1–3 business days from legacy inventory
- Pricing Note: Listed price is indicative and subject to vintage market conditions. Contact our sales office for a firm, up-to-date quote.
Technical Specifications
| Parameter | Value |
| Model Number | 07KT98 / 07 KT 98 |
| Product ID | GJR5253100R0260 |
| User Memory | 1 MB User Program + 1 MB User Data + 256 KB RETAIN Flash |
| Nominal Supply Voltage | 24 V DC (Effective operational range: 19.2 to 30 V DC) |
| Integrated Digital Inputs | 24 channels (24 V DC, electrically isolated in 3 groups of 8) |
| Integrated Digital Outputs | 16 transistor channels (24 V DC, 0.5 A, isolated in 2 groups of 8) |
| Configurable Digital I/O | 8 channels (Can be defined as either inputs or outputs) |
| Integrated Analog Inputs | 8 channels (Individually configurable: 0–10V, ±10V, 0–20mA, 4–20mA, Pt100) |
| Integrated Analog Outputs | 4 channels (Individually configurable: ±10V, 0–20mA, 4–20mA) |
| High-Speed Counters | 2 internal hardware counters (Up to 50 kHz, 7 operating modes) |
| Network Interfaces | 1 x CS31 System Bus, 1 x ARCNET Network Interface |
| Serial Communication | 2 x RS232 ports (COM1 / COM2 supporting Modbus RTU or free ASCII programming) |
| Programming Environment | 907 AC 1131 software utility (IEC 61131-3 compliant) |
Field Experience & Engineering Insights
Networking and Communication Topologies
In field applications, the 07KT98 provides flexible configuration paths. The onboard CS31 system bus interface enables centralized master execution to drive up to 31 remote I/O expansion modules over simple twisted-pair media. Additionally, this specific variant incorporates an ARCNET interface. During network layout design, ensure the specific network token ring rules are explicitly set in the system parameters to avoid data collisions or sluggish node dropouts.
Memory Card and Backup Operations
- SmartMedia Interface: The front layout houses a specialized SmartMedia slot. This external card stores the compiled user program, operating system updates, and user databanks. Warning: Avoid pulling or seating the SmartMedia card while the system is actively processing or executing code; doing so will result in runtime exceptions or fatal system corruptions.
- Battery Preservation: Volatile RAM sectors and the real-time clock (RTC) rely on an external plug-in lithium battery pack (Model: 07LE90). When executing preventative maintenance cycles, always check that the unit remains powered up by its primary 24 V DC line before removing an old battery cell; breaking both power lines concurrently causes immediate erasure of unbacked variable flags and system registers.
Analog Ingress Guarding
The 8 onboard analog inputs are highly flexible, accommodating raw currents, voltages, or direct 2-wire/3-wire Pt100 RTD resistance curves. However, the analog channels share a common internal ground plane. If sensors are deployed across long physical distances in high-vibration or high-EMI environments (such as near large variable frequency drives), utilize external loop isolators to prevent ground loop noise from falsifying analog readings or causing minor hardware faults.
System Integration & Compatibility Checklist
- Chassis & Mounting: Supports direct standard DIN-rail assembly or flat panel screw-down installation matrices.
- Peripheral Couplers: Features a dedicated parallel bus extension interface slot on the side housing to receive advanced network modules, including the 07KP90 (RCOM link) or 07KP93 (Dual Modbus expansion).
- Programming Compatibility: Requires 907 AC 1131 software tools (Version 4.1 or later for ARCNET variants) running within legacy Windows compatibility environments.
Frequently Asked Questions
Can the 07KT98 process standard 4 to 20 mA signals without external shunt resistors?
Yes. The analog inputs are individually software-configurable. Selecting the 4 to 20 mA parameter mode activates the internal current measurement path, eliminating the need to bridge terminals with external precision resistors.
What indicates a failure of the internal self-diagnostic routine?
The front bezel incorporates diagnostics LEDs indicating operating and error states. If a major internal fault occurs (such as an EEPROM checksum failure or a CPU logic error), the processor switches the active RUN output off, forces the systemic outputs to a zero/safe state, and displays the specific error matrix code via the hardware LEDs.
Is it possible to use the 07KT98 GJR5253100R0260 on a PROFIBUS DP link?
Not natively as a master module. The baseline R0260 incorporates ARCNET and CS31 system buses. For direct native PROFIBUS DP networking applications, you must choose the alternate model variant (such as the 07KT98 with PROFIBUS card options) or add a compatible standalone serial/PROFIBUS communication bridge.
