ABB CI856K01 3BSE026055R1 – High-Performance Redundant Communication Interface for Industrial Control Systems

If you’re running an AC 800M or Modicon-based automation setup, the ABB CI856K01 (3BSE026055R1) typically shows up as one of those components that doesn’t get much attention—until it fails. From my experience, this module is more than just a communication bridge; it’s a reliability anchor in systems where uptime matters. It’s designed to handle redundant Controller Area Network (CAN) communication, which means if one path goes down, the other keeps things moving without a hiccup.

Key Features

• Redundant CAN Communication: Supports dual CAN bus channels for failover capability—useful in critical processes like power generation or continuous manufacturing.
• Hot-Swappable Design: You can replace or service the module without shutting down the system, which in many cases reduces unplanned downtime.
• Integrated Diagnostics: Built-in LED indicators make troubleshooting easier. One thing I appreciate is how quickly you can spot a sync loss or channel fault just by glancing at the front panel.
• Backplane Integration: Connects directly via the S800 I/O bus, minimizing external cabling and reducing points of failure.
• Firmware Flexibility: Compatible with multiple versions of ABB’s System 800xA, though it seems to perform best when aligned with firmware revision 2.6 or later.

Technical Specifications

Application Fields

This module pops up most often in heavy industrial environments—power plants, water treatment facilities, and oil & gas installations—where redundant control networks are non-negotiable. It’s commonly used to link programmable controllers with remote I/O stations over CANopen or DeviceNet-like protocols. In pulp and paper mills, for example, I’ve seen it maintain stable comms between speed controllers on long production lines, even under high electrical noise conditions.

Advantages & Value

Procurement teams tend to focus on lifecycle cost, not just sticker price. The CI856K01 isn’t the cheapest CAN interface out there, but its mean time between failures (MTBF) is impressively high—often exceeding 10 years in well-maintained cabinets. That kind of reliability cuts down on spare part inventory and emergency callouts. Also, since it’s fully compatible with ABB’s engineering tools (like Control Builder M), integration time is shorter compared to third-party alternatives. Tech support from authorized suppliers is usually responsive, which helps during commissioning.

Installation & Maintenance

You’ll want to install this in a standard S800-compatible cabinet with adequate ventilation—don’t stack it next to high-heat sources like motor drives. Make sure the backplane connections are clean and fully seated. One thing I’ve noticed: people sometimes overlook grounding, but proper chassis bonding really helps reduce CAN bus errors in electrically noisy areas. For maintenance, periodic visual checks and cleaning of connectors go a long way. Firmware updates aren’t frequent, but when available, they’re worth applying—especially if you’re seeing intermittent sync issues.

Quality & Certifications

The module carries CE, UL, and RoHS compliance marks, so it meets typical regulatory requirements for deployment across North America and Europe. It’s also designed in accordance with IEC 61131-2 standards for industrial control equipment. The standard warranty period is 365 days, covering defects in materials and workmanship—assuming normal operating conditions and no physical damage. In practice, most reputable suppliers will offer advance replacement for verified faults, which helps minimize process disruption.

Our Order Placement Process & Guarantees

– Warranty: 365 days from date of delivery
– Delivery Time: 1 week for in-stock units; no more than one month for backordered items
– Payment Terms: 50% advance payment, balance due before shipment
– Shipping: Delivered via FedEx, UPS, or DHL—tracking provided upon dispatch