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Key Technical Specifications
- Product Model: CI857K01
- Manufacturer: ABB
- System Family: ABB Ability™ System 800xA / AC 800M controller platform
- Module Type: Dual-channel redundant PROFIBUS communication interface
- Part Number: 3BSE018144R1
- Communication Standard: PROFIBUS DP (Class 1 & 2) and PROFIBUS PA (via couplers)
- Ports: 2 × isolated RS-485 PROFIBUS ports (9-pin D-sub)
- Data Rate: Up to 12 Mbps per channel
- Redundancy Support: Full controller and bus redundancy (with paired CI857K01 and redundant AC 800M CPU)
- Hot-Swap: Supported – module can be replaced during operation without system shutdown
- Diagnostics: LED indicators for power, module status, PROFIBUS activity, and fault; detailed diagnostics via 800xA
- Mounting: DIN-rail in AC 800M I/O rail (requires standard backplane)
- Programming & Configuration: ABB Automation Builder / Control Builder M within System 800xA environment
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CI857K01 3BSE018144R1
Core Performance and Selection Advantages
The ABB CI857K01 delivers significant value in modern distributed control systems by enabling robust, high-availability fieldbus integration without compromising on performance or maintainability. Each of its two independent PROFIBUS channels operates at up to 12 Mbps, supporting up to 126 slaves per network—sufficient for large I/O clusters in complex process areas. Unlike single-port alternatives, the dual-channel design allows true bus redundancy or segregation of device types (e.g., one channel for actuators, another for analyzers), enhancing both reliability and network manageability.
A key performance advantage over legacy interfaces is its deep integration with the AC 800M runtime. The module offloads protocol handling from the main CPU while providing real-time diagnostics that are automatically surfaced in the 800xA operator environment—reducing troubleshooting time during commissioning or operation. Its support for both PROFIBUS DP and PA (via segment couplers) simplifies architecture in hybrid applications, eliminating the need for external gateways.
From a total cost of ownership (TCO) standpoint, the CI857K01 reduces project risk and lifecycle costs. Hot-swap capability minimizes unplanned downtime during maintenance, while native redundancy avoids third-party failover solutions. Furthermore, because it is configured entirely within the 800xA engineering suite, there is no need for separate GSD management tools or manual address mapping—accelerating engineering and reducing configuration errors.
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CI857K01 3BSE018144R1
System Integration and Scalability
The CI857K01 is engineered exclusively for use within ABB’s System 800xA platform. Configuration is performed in Control Builder M (part of Automation Builder), where PROFIBUS devices are imported via GSD files and mapped directly into the control application using standardized function blocks (e.g., PDP_Read, PDP_Write). This tight integration ensures automatic symbol generation, online diagnostics, and version-controlled deployment.
For higher-level connectivity, PROFIBUS data from the CI857K01 is natively available in 800xA’s Aspect Directory, enabling seamless exposure to HMI graphics, batch systems, asset management, and enterprise historians. While PROFIBUS itself does not support OPC UA natively, the AC 800M controller aggregates this data and serves it via built-in OPC UA servers—facilitating secure cloud or MES integration without additional middleware.
Scalability is achieved through modular expansion: a single AC 800M rail can host multiple CI857K01 modules to support dozens of PROFIBUS segments across a plant area. In redundant configurations, paired CI857K01 units synchronize bus states to ensure zero-loss switchover (< 100 ms). The module also coexists with other communication interfaces (e.g., CI867 for Modbus TCP, CI871 for PROFINET), allowing hybrid network strategies during brownfield upgrades. This flexibility makes the CI857K01 a future-proof choice for projects requiring long-term operational stability and phased technology adoption.
