ABB NKTU Series Modules NKTU01-20

Name: ABB NKTU Series Modules NKTU01-20
Brand: ABB

Model: NKTU01-20

Brand ABB

Series NKTU Series

Model NKTU01-20

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Technical Dossier

Product Details And Specifications

ABB NKTU Series Technical Notes

The ABB NKTU series is a family of I/O bus termination and communication interface modules developed for ABB's Advant Controller and AC800M distributed control system (DCS) platforms. These modules are deployed across global heavy industry sectors including petrochemical refineries, nuclear power stations, offshore oil & gas platforms, pulp and paper mills, and large-scale chemical processing facilities. The NKTU series functions as the physical and logical bridge between field instrumentation and the controller backplane, enabling deterministic, high-integrity signal transmission in safety-critical environments. Installed base counts for this series run into the tens of thousands of nodes globally, making long-term parts availability a primary operational concern for plant maintenance engineers.

The Evolution of NKTU Series Architecture

The NKTU series was introduced as part of ABB's Advant OCS (Open Control System) architecture in the early 1990s, designed to interface S100 and S800 I/O families with the Advant Controller 110, 160, and 450 platforms. Original NKTU01 variants used parallel backplane communication over ABB's proprietary S100 bus protocol. As ABB transitioned to the AC800M platform in the late 1990s and early 2000s, the NKTU series was extended to support Modulebus and PROFIBUS-DP communication layers, enabling coexistence with modern fieldbus architectures.

NKTU Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the ABB NKTU and closely associated Advant/AC800M I/O interface families, classified by functional category.

I/O Bus Termination Units (NKTU Core Series)

NKTU01-10: S100 I/O bus termination unit, revision 10, original hardware release, single-channel
NKTU01-20: S100 I/O bus termination unit, revision 20, improved EMC shielding, extended temp range
NKTU02-20: Dual-channel I/O bus termination unit for redundant S100 backplane configurations
NKTU03-20: Extended I/O bus termination unit with enhanced diagnostic LED array and fault isolation
NKTU04-20: High-density bus termination unit, supports up to 12 I/O modules per rack segment

Analog Input (AI) Modules

AI810: 8-channel analog input, 4–20 mA / 0–10 V, HART-capable, S800 I/O family
AI820: 8-channel analog input with galvanic isolation per channel, 4–20 mA
AI830A: 8-channel RTD/thermocouple analog input, multi-sensor type configurable
AI835A: 8-channel HART analog input, loop-powered, SIL 2 rated per IEC 61508
AI843: 4-channel high-accuracy analog input, ±0.05% full-scale accuracy, isolated

Analog Output (AO) Modules

AO810V2: 8-channel analog output, 4–20 mA, HART-capable, hardware revision 2
AO820: 8-channel analog output with individual channel galvanic isolation, 4–20 mA
AO845A: 4-channel high-accuracy analog output, SIL 2 rated, redundancy-capable

Digital Input (DI) Modules

DI810: 24-channel 24 VDC digital input, sink/source configurable, S800 I/O family
DI820: 24-channel digital input, 120 VAC field voltage compatible
DI830: 24-channel digital input with SOE (Sequence of Events) 1 ms timestamping
DI840: 24-channel digital input, 24 VDC, SIL 2 rated, used in safety-instrumented systems

Digital Output (DO) Modules

DO810: 24-channel 24 VDC digital output, 0.5 A per channel, transistor output
DO820: 16-channel relay output module, 2 A per contact, AC/DC field voltage
DO840: 24-channel digital output, SIL 2 rated, used in safety shutdown applications

CPU & Communication Modules

PM864A: AC800M main processor module, 32 MB RAM, dual 10/100 Ethernet ports
PM865A: AC800M high-performance processor, 64 MB RAM, hot-standby redundancy-capable
CI854A: PROFIBUS-DP master/slave communication interface for AC800M rack
CI856: INSUM communication interface module for MNS motor control center integration
CI858: DeviceNet communication interface module for AC800M, master mode

Quality Control for the NKTU Series Range

NKTU series modules present specific test challenges due to their backplane bus interface architecture and multi-pin edge connector design. DriveKNMS applies the following quality control protocol to all NKTU units processed through its facility:

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