The ABB Advant Controller 31 series includes the 07KT97 and 07KT98, two basic unit controllers that differ in their positioning within the same series. The 07KT98 is a high-performance upgrade of the 07KT97 on the same hardware platform. While highly consistent in mechanical structure, I/O interfaces, and basic functions, the 07KT98 features significant enhancements in processor performance, memory capacity, network integration capabilities, and software support.
Differences between 07KT97 and 07KT98:
Product Positioning: The KT97 is a standard performance basic unit, while the KT98 is a high-performance basic unit. The KT98 is positioned at a higher end, used for more complex and faster control tasks.
Processing Performance KT97 processing time (1 kB program): 0.3 ms; KT98 processing time: 0.07 ms; KT98 processing speed is approximately 4.3 times that of KT97, with shorter scan cycles and more real-time control.
Memory System: KT97 user program memory: 480 kB; KT98 memory: 1 MB. KT98 can accommodate larger and more complex control logic.
KT97 user data (RAM): 256 kB; KT98 data (RAM): 1 MB. KT98 can handle and manage more process variables and recipe data.
KT97's retention memory (RETAIN) is not explicitly specified; KT97's RETAIN is 256 kB, while KT98 has a dedicated, larger area for power-off data retention (such as recipes and cumulative values).
The KT97 has an integrated Flash EPROM of 512 kB (for program and configuration); the KT98 has an integrated Flash EPROM of 1 MB for program + 128 kB for user data. The KT98 has a larger Flash capacity and more flexible partitioning.
Regarding integrated network options, the KT98 offers more natively integrated high-level network combinations, especially the dual Ethernet model, which facilitates network segmentation or redundancy without the need for external modules.
In terms of software version requirements, the KT97 can use general software, but the KT98 has higher requirements for specific networks: ARCNET: V4.1+; PROFIBUS-DP: V4.2.1+. When selecting a KT98, it is essential to verify whether the software version supports its integrated network.
Similarities between 07KT97 and 07KT98: 
24 digital inputs (DI), divided into 3 isolated groups; identical terminal blocks and LED indicators.
16 digital output (DO) transistors, isolated in 2 groups, with identical rated current (500mA), protection functions, and wiring.
8 digital input/output (DIO) transistors, 1 group, configurable, usable as input, output, or readback output.
8 analog inputs (AI), configurable (voltage/current/Pt100/digital).
4 analog outputs (AO), configurable (voltage/current) | Identical | Identical resolution, accuracy, and wiring.
1 high-speed counter, up to 50kHz, 7 modes.
System bus CS31 (EIA RS-485), for expanding remote I/O modules, with identical capabilities.
Serial interfaces COM1, COM2 (RS-232, supports MODBUS), for debugging and connecting touchscreens, etc.
Parallel expansion interface for connecting communication processors (such as 07KP90), providing additional network expansion possibilities.
Rated voltage 24 V DC. Mounting methods are DIN rail or screw, with removable screw terminals.
Selection Guide
Requirement 1: For maintenance and simple replacement of existing KT97 systems, choose the same model KT97 for a completely equivalent replacement.
Requirement 2: For complex existing programs with excessively long scan cycles, choose 07KT98 to shorten scan cycles and improve control performance.
Requirement 3: For adding more data logging and recipe functions, choose 07KT98 to enhance user data and dedicated RETAIN memory.
Requirement 4: For integrating multiple networks such as Ethernet and PROFIBUS, 07KT98 (e.g., R0272) is more suitable, saving an external communication module and reducing potential points of failure.
Requirement 5: For requiring dual Ethernet ports for network isolation, only 07KT98 offers this option, better meeting the needs of modern network architectures.
Ordering Information:
1.07KT97
GJR5253000R0100  Basic unit 07KT97 R0100
GJR5253000R0200  Basic unit 07KT97 R0200
GJR5253000R0120  Basic unit 07KT97 R0120 (+ PROFIBUS-DP) 
GJR5253000R0220  Basic unit 07KT97 R0220 (+ PROFIBUS-DP) 
GJR5253000R0160  Basic unit 07KT97 R0160 (+ ARCNET) 
GJR5253000R0260  Basic unit 07KT97 R0260 (+ ARCNET) 
GJR5253000R0162  Basic unit 07KT97 R0162 (+ ARCNET + PROFIBUS-DP) 
GJR5253000R0262  Basic unit 07KT97 R0262 (+ ARCNET + PROFIBUS-DP) 
GJR5253000R0270  Basic unit 07KT97 R0270 (+ Ethernet) 
GJR5253000R0272  Basic unit 07KT97 R0272 (+ Ethernet + PROFIBUS-DP) 
GJR5253000R0276  Basic unit 07KT97 R0276 (+ Ethernet + ARCNET) 
GJR5253000R0277  Basic unit 07KT97 R0277 (+ Ethernet + Ethernet) 
GJR5253000R0278  Basic unit 07KT97 R0278 (+ Ethernet + CANopen) 
GJR5253000R0280  Basic unit 07KT97 R0280 (+ CANopen)

2. 07KT98
GJR5253100R0120   Basic unit 07KT98 R0120 (+ PROFIBUS-DP)
GJR5253100R0220   Basic unit 07KT98 R0220 (+ PROFIBUS-DP) 
GJR5253100R0160   Basic unit 07KT98 R0160 (+ ARCNET)
GJR5253100R0260   Basic unit 07KT98 R0260 (+ ARCNET) 
GJR5253100R0162   Basic unit 07KT98 R0162 (+ ARCNET + PROFIBUS-DP) 
GJR5253100R0262   Basic unit 07KT98 R0262 (+ ARCNET + PROFIBUS-DP) 
GJR5253100R0268   Basic unit 07KT98 R0268 (+ ARCNET + CANopen)
GJR5253100R0270   Basic unit 07KT98 R0270 (+ Ethernet) 
GJR5253100R0272   Basic unit 07KT98 R0272 (+ Ethernet + PROFIBUS-DP)
GJR5253100R0276   Basic unit 07KT98 R0276 (+ Ethernet + ARCNET)
GJR5253100R0277   Basic unit 07KT98 R0277 (+ Ethernet + Ethernet) 
GJR5253100R0278   Basic unit 07KT98 R0278 (+ Ethernet + CANopen)
GJR5253100R0280   Basic unit 07KT98 R0280 (+ CANopen)
GJR5253100R3160   Basic unit 07KT98 R0260 (+ ARCNET)
GJR5250700R0001   Battery module 07LE90