ABB CI856 S100 I/O Software License 800xA for AC 800M

Introduction

When upgrading a legacy ABB Master or Advant OCS installation, engineers often face the challenge of reusing existing I/O wiring and terminations without compromising system performance. The ABB CI856 (3BSE026055R3) S100 I/O Software License 800xA solves this by providing a dedicated communication interface that connects S100 I/O units to AC 800M controllers via the CEX-Bus. This module allows you to retain most of your field wiring, reducing downtime and installation costs.

Technical Specifications Breakdown

The CI856 operates as a master device using ABB's S100 I/O protocol. It connects to the CEX-Bus through a base plate (TP856) with a ribbon connector, supporting up to five S100 I/O racks, each holding up to 20 I/O boards. Key specifications include a 24 V consumption of typ. 120 mA, operating temperature range of 0 to +55 °C (+32 to +131 °F), and storage temperature from -40 to +70 °C (-40 to +158 °F). The module measures 59 mm wide, 185 mm high, and 127.5 mm deep, weighing 700 g (including base). It features IP20 protection class per EN60529 and IEC 529, with G3 corrosion protection compliant to ISA 71.04. The CI856 supports hot swap functionality and includes a code locking device to prevent mounting incompatible components.

Industry Applications

In process industries such as oil and gas, chemical, and power generation, the CI856 enables seamless integration of existing S100 I/O installations with modern ABB 800xA control systems. For example, a refinery upgrading its distributed control system can reuse field wiring from old Advant OCS racks, significantly cutting project costs and commissioning time. The ability to connect up to five I/O racks per CI856 makes it ideal for medium-sized I/O counts where space and budget are constrained.

Installation & Setup Guidance

Mount the TP856 base plate on a DIN rail and connect the CI856 to the CEX-Bus via the base plate's ribbon connector. No external power supply is needed; the CI856 draws power from the processor unit through the CEX-Bus. Ensure the code locking device aligns correctly to avoid incompatible components. Connect up to five S100 I/O racks using bus extender boards, and verify hot swap capability by inserting or removing I/O boards without powering down the system.

Maintenance & Reliability

Routine inspection of the ribbon connector and base plate contacts ensures reliable communication. The G3 corrosion protection and IP20 rating suit clean industrial environments. Periodic checks of the code locking device prevent accidental mismatches. Since the CI856 requires no external power, maintenance focuses on verifying CEX-Bus connectivity and I/O rack status. Follow manufacturer guidelines for periodic system testing to maintain uptime.

Compatibility & Integration

The CI856 works exclusively with ABB's S100 I/O protocol and AC 800M controllers via the CEX-Bus. It supports up to 12 units on the CEX-Bus and integrates with HI Controller systems. The module uses a 36-pin Miniribbon connector for bus extension. For replacement or expansion, verify that your existing S100 I/O racks are compatible with the CI856's master mode and hot swap support.

Selection Guide & Purchasing Advice

Before ordering, confirm your AC 800M controller supports the CI856 and that your S100 I/O racks are within the five-rack limit. The CI856 requires the TP856 base plate (sold separately). Contact BluePLC Industrial to verify current lifecycle status and availability. Our team can help you identify the correct part number (3BSE026055R1 or 3BSE026055R3) and ensure compatibility with your existing 800xA system.