Category Archives: News

ABB TB5610-2ETH CPU Base Unit – Dual Ethernet Port Backbone for AC 500 PLC Systems

Description The ABB TB5610-2ETH is a robust CPU base unit designed specifically for the ABB AC 500 series of programmable logic controllers (PLCs). Serving as the foundational hardware platform, the TB5610-2ETH houses the processor module (PM) and provides critical connectivity features, including two integrated Ethernet ports for flexible network topologies (e.g., line, star, or ring). Uniquely, this model features one communication coprocessor…

ABB TB870F Terminal Base Module for Freelance AC 800F/AC 900F DCS

Description The ABB TB870F is a robust Terminal Base Module engineered specifically for the ABB Freelance DCS ecosystem, providing the critical interface for AC 800F and AC 900F I/O modules. This versatile unit serves as the primary connection point for field instrumentation, offering secure screw-terminal blocks for wiring and, in specific configurations, integrated termination resistors essential for high-speed fieldbus communications (such as Profibus-DP or CAN). Designed to…

ABB TB853 Termination Unit – High-Reliability Base for Dual-Channel Control Links

Description The ABB TB853 is a specialized Termination Base designed exclusively for Redundant Control Links (RCU) within the ABB AC 800M controller family. Serving as the crucial interface between the controller’s communication ports and the fieldbus cabling (typically Profibus DP or ABB proprietary links), the TB853 ensures signal integrity in high-speed, dual-channel networks. Its defining feature is the built-in Terminal Resistance (usually selectable or fixed at 120Ω),…

Reliable ABB TB852 (3BSC950263R1): Secure Your AC 800M Remote I/O & Communication Redundancy

Description The ABB TB852 (Order No: 3BSC950263R1) is a specialized RCU (Remote Control Unit) Link Interface Module designed exclusively for the ABB AC 800M control system platform. While often mistakenly referred to as a “redundant controller,” the TB852 actually serves as the critical communication gateway that enables PM86x series controllers (including redundant pairs like PM867) to connect to distributed S800 I/O stations over long distances via fiber…

ABB TB851: Essential CEX-Bus Terminal Unit for S800 I/O & AC 800M Systems

Description The ABB TB851 is a specialized Terminal Unit designed for the ABB S800 I/O system, specifically serving as the CEX-Bus termination point. The CEX-Bus (Controller Extension Bus) is the high-speed serial communication link that connects the AC 800M controller (via a CI854. CI855. or CI867 communication interface) to the distributed S800 I/O modules (DI, DO, AI, AO, etc.). The primary function of the TB851 is…

ABB TB846 Redundant Module Bus Outlet: Critical Interface for AC 800M High-Availability Systems

Description The ABB TB846 (Order Code: 3BSE021439R1) is a specialized Redundant Module Bus Outlet designed specifically for the ABB AC 800M series of programmable logic controllers (PLCs). Serving as a critical interface component, the TB846 facilitates high-speed, deterministic communication between redundant controller units (PM856. PM860. PM861. etc.) and their associated I/O networks or fieldbus segments. It acts as the physical termination and…

ABB TB846 (3BSE021439R1): Robust Signal Distribution for Critical Control Networks

Description The ABB TB846 (Order Code: 3BSE021439R1) is a specialized Redundant Module Bus Outlet designed specifically for the ABB AC 800M series of programmable logic controllers (PLCs). Serving as a critical interface component, the TB846 facilitates high-speed, deterministic communication between redundant controller units (PM856. PM860. PM861. etc.) and their associated I/O networks or fieldbus segments. It acts as the physical termination and…

ABB TB845 Redundant Bus Outlet Module – Essential PROFIBUS Termination for S800 I/O

Description The ABB TB845 is a high-reliability Termination Base engineered specifically for the ABB S800 I/O system within the 800xA architecture. Acting as the gateway for redundant PROFIBUS DP (or compatible Fieldbus) networks, this module provides the physical connection point where the fieldbus cable enters the I/O station. The TB845 features built-in termination resistors and redundancy switching logic, ensuring that if one communication line fails, the system…

ABB TB840A (3BSE037760R1): High-Performance Modulebus Cluster Modem for AC 800M Systems

Description The ABB TB840A (Order No. 3BSE037760R1) is a specialized communication interface module designed specifically for the ABB AC 800M controller series and the S800 I/O system. Functioning as a Modulebus cluster modem, the TB840A serves as the critical gateway that connects the central controller to distributed clusters of I/O units over the high-speed Modulebus network. Unlike standard I/O modules, the TB840A manages the communication protocol,…

ABB TB840A: The Heart of Obsolete S800 I/O Clusters in Power, Oil & Gas, and Marine Systems

Description The TB840A (Order Code: 3BSE037760R1) is a specialized ModuleBus Cluster Modem manufactured by ABB, designed specifically for the S800 I/O system within the AC 800M distributed control system (DCS) architecture. This critical communication module acts as the bridge between the main controller (via CI85x communication interfaces) and remote clusters of S800 I/O units. It enables the extension of the ModuleBus over longer distances…