The CI801 Fieldbus Communications Interface (FCI) is a high-performance, high-reliability intelligent communication interface module designed by ABB for industrial automation control systems. Acting as a critical bridge between the controller and field I/O modules, this module communicates with the upper-level control system via the PROFIBUS-DPV1 fieldbus and exchanges data with S800 series I/O modules via the ModuleBus. It is suitable for various demanding industrial environments such as process industries, manufacturing, and energy management.
The CI801 integrates multiple functions including communication processing, power management, signal isolation, and module configuration into a single unit. It supports advanced features like hot swapping, online configuration, and HART protocol pass-through, significantly enhancing system flexibility, maintainability, and scalability. Its modular design, compact structure, and high protection rating make it an ideal choice for building modern Distributed Control Systems (DCS) and Programmable Logic Controller (PLC) systems.
II. Key Features
PROFIBUS-DPV1 Interface: Supports the standard PROFIBUS-DPV1 protocol with a maximum communication speed of 12 Mbit/s, suitable for high-speed, reliable field-level data exchange.
Intelligent ModuleBus Management: Provides monitoring, configuration, and data exchange capabilities for S800 I/O modules, supporting up to 12 I/O modules.
Isolated Power Supply Design: Incorporates isolated power converters to provide stable and safe +5V and +24V power for the module itself and the ModuleBus.
Online Hot Configuration: Supports "Hot Configuration In Run," allowing addition, removal, or replacement of I/O modules without system shutdown.
HART Protocol Pass-Through: Supports transmission of HART signals via the ModuleBus, facilitating integration with smart instruments.
Dual Address Setting: Station address (0-99) is set via two rotary switches, with address 0 reserved for service mode.
Comprehensive Diagnostics and Indication: Equipped with multi-status LED indicators for quick on-site diagnostics and maintenance.
Integrated Service Port: The PROFIBUS interface also functions as a service port, convenient for engineers for on-site debugging and maintenance.
III. Detailed Product Functionality
1. Communication Interface and Protocol Support
As a PROFIBUS-DPV1 slave device, the CI801 seamlessly integrates into existing PROFIBUS networks, enabling high-speed data exchange with masters (such as PLCs or DCS controllers). It supports DPV1 extended functions, including parameterization, configuration, diagnostics, and alarm handling, making it suitable for complex automation tasks.
2. ModuleBus Management and Expansion
Via the electrical ModuleBus, the CI801 can connect up to 12 S800 series I/O modules (e.g., digital I/O, analog I/O, temperature modules) and is responsible for module power supply, communication scheduling, and status monitoring. The module supports online hot swapping, greatly enhancing system availability and maintenance convenience.
3. Power Management and Isolation
The CI801 incorporates a high-efficiency isolated power supply that converts the external 24V DC input into internal operating power and the +5V/+24V power required by the ModuleBus. All outputs feature overcurrent and short-circuit protection, ensuring stable system operation and preventing fault propagation.
4. Configuration and Diagnostics
Rotary Switch Setting: The PROFIBUS station address (0-99) is easily set via two decimal rotary switches.
Service Port: The PROFIBUS interface is multiplexed as a service port, supporting local debugging, firmware updates, and diagnostics.
LED Status Indication: Multi-color LEDs provide intuitive indication for power, communication, and module status.
5. Mechanical and Installation Design
DIN Rail Mounting: Designed for standard 35 mm DIN rail mounting, with grounding achieved through the rail.
Compact Structure: Width of only 86.1 mm saves cabinet space.
Removable Terminals: Power and bus connections use screw terminals, supporting quick wiring and replacement.
IV. Typical Application Scenarios
The CI801 is suitable for various industrial automation applications, especially systems requiring high reliability, real-time performance, and flexible expansion:
Process Industries: DCS systems in chemical, oil & gas, and pharmaceutical industries.
Manufacturing: PLC systems in automotive, food & beverage, and packaging machinery.
Energy Management: Monitoring and data acquisition in substations, power plants, and distribution systems.
Infrastructure: Building automation, water treatment, and traffic control.
V. Installation and Wiring Recommendations
Power Supply: Use a stable, clean 24V DC power source and ensure proper grounding.
PROFIBUS Wiring: Use shielded twisted pair cable, with termination resistors installed at both ends of the bus.
ModuleBus Connection: Use wires with recommended cross-sections, observe polarity, and avoid short circuits.
Environment: Avoid installation in areas with high temperature, high humidity, strong corrosion, or excessive vibration.
