ABB CI858 DriveBus Communication Interface for AC 800M Controller

Product Overview

The ABB CI858 DriveBus communication interface unit provides a reliable link between ABB Drives and the AC 800M controller, ensuring stable data flow in demanding industrial environments. Powered directly via the CEX-Bus, this module requires no external power source, simplifying installation and reducing wiring complexity.

Technical Specifications Breakdown

The CI858 operates at a transmission speed of 8 Mbit/s, enabling fast data exchange for coordinated drive control. It supports a maximum of 24 ABB drives per module, with up to two CI858 units per AC 800M controller. The optical connector ensures robust signal integrity over longer distances, while the 24 V consumption is typically 200 mA. Operating temperature ranges from +5 to +55 °C (+41 to +131 °F), with storage from -40 to +70 °C (-40 to +158 °F). The IP20 protection class suits clean indoor environments, and G3 corrosion compliance (ISA 71.04) adds durability in harsh conditions.

Industry Applications

In rolling mill drive systems, the CI858 enables precise speed and torque coordination across multiple drives, reducing material waste and improving product quality. Paper machine control systems benefit from the DriveBus protocol's deterministic communication, ensuring consistent web tension and register control. The hot swap feature allows drive replacement without system shutdown, minimizing downtime in continuous processes.

Installation & Setup Guidance

Mount the CI858 on a standard DIN rail within the AC 800M cabinet. Connect the optical cable from the DriveBus port to the first ABB drive or NDBU branching unit. For systems with more than one drive, use NDBU units to create a logical bus with physical star topology. No external power is needed—the module draws power from the CEX-Bus. Verify that the CEX-Bus connection is secure and that the CI858 is recognized by the controller configuration software.

Maintenance & Reliability

Regular inspection of the optical connector for dust or damage ensures consistent communication. The CI858's G3 corrosion protection extends service life in environments with airborne contaminants. Because the module is powered by the processor unit, there are fewer points of failure compared to externally powered interfaces. Periodic firmware updates, if available, can enhance compatibility with newer ABB drives.

Compatibility & Integration

The CI858 is designed exclusively for ABB's DriveBus protocol and works with ABB Drives and ABB Special I/O units. It integrates with the AC 800M controller via the CEX-Bus, supporting up to two modules per controller. The DriveBus interface is purpose-built for sectional drive applications in rolling mills and paper machines. The module does not support line or module redundancy, but the hot swap capability allows drive replacement without system interruption.

Selection Guide & Purchasing Advice

Before ordering, verify that your AC 800M controller has an available CEX-Bus slot and that your ABB drives are compatible with DriveBus. For systems with multiple drives, ensure you have the necessary NDBU branching units. The CI858 article number is 3BSE018135R1. AutoDCSTech stocks this module and can confirm current lifecycle status and availability. Contact our team for assistance with configuration and system integration.