What Is the ABB CI920AB Communication Interface?
When industrial processes demand reliable fieldbus communication in hazardous environments, the ABB CI920AB (3BDH000691R1) delivers a robust solution. This communication interface is part of the S900 I/O system, designed for installation in non-hazardous areas or directly in Zone 2 hazardous locations. It bridges the internal CAN bus to external PROFIBUS DP-V1 (IEC 61158), enabling seamless data exchange between field devices and control systems.
Key Technical Specifications
The CI920AB offers several critical specifications that ensure dependable operation:
- PROFIBUS DP-V1 Protocol: Supports the IEC 61158 standard for deterministic, high-speed communication.
- Redundancy: Provides power and communication redundancy for increased system availability.
- Hot Configuration in Run: Allows parameter changes without stopping the process.
- Hot Swap Functionality: Enables module replacement during operation, reducing downtime.
- ATEX Zone 2 Certification: Certified for use in hazardous areas with explosive gas atmospheres.
- Extended Diagnostic: Offers detailed fault detection via FDT/DTM tools.
- HART over PROFIBUS DP-V1: Transmits HART data from field instruments over the same bus.
- Electrical Isolation: Isolates fieldbus, power, and internal circuits to prevent ground loops.
Industry Applications
In chemical plants, refineries, and oil and gas facilities, the CI920AB connects intrinsically safe field devices installed in Zone 0, Zone 1, or Zone 2 areas. Its compact 20 mm width and lightweight 0.13 kg design allow dense mounting in field enclosures, reducing marshalling costs. For example, in a refinery's distributed control system, the CI920AB integrates remote I/O stations with the main controller via PROFIBUS DP-V1, enabling real-time monitoring of pressure and temperature transmitters while maintaining safety integrity.
Installation and Setup Guidance
Mount the CI920AB on a standard DIN rail within an S900 I/O system. Ensure the ambient temperature stays between -20 °C and 60 °C and relative humidity does not exceed 93 % at 40 °C. Use only modules with identical firmware for redundant configurations, as specified in the Release Notes. The module supports line or media redundancy via two coupling modules, enhancing fault tolerance.
Maintenance and Reliability
The CI920AB includes auto-diagnostics and a G3 coating per ISA-S71.04, protecting against corrosive atmospheres. Integrated disconnection mechanisms allow replacement during operation without interrupting primary voltage. Regular inspection of the PROFIBUS DP-V1 connection and diagnostic LEDs helps maintain uptime. This design reduces maintenance costs by minimizing process interruptions.
Compatibility and Integration
The CI920AB communicates with control systems using the PROFIBUS DP-V1 standard. It works with ABB S900 I/O modules and supports HART over PROFIBUS for smart field devices. Configuration and diagnostics are performed via FDT/DTM tools, simplifying setup. The module is CE marked and complies with RoHS and WEEE directives.
Selection Guide and Purchasing Advice
Before ordering the CI920AB, verify that your system requires PROFIBUS DP-V1 communication and that the firmware version matches existing modules for redundancy. Contact SpareTechPLC to confirm current lifecycle status and availability. SpareTechPLC stocks genuine ABB parts with fast shipping and expert support.
Frequently Asked Questions
Q: Can the CI920AB be used in Zone 1 hazardous areas?
A: The CI920AB is certified for ATEX Zone 2. For Zone 1 applications, use the appropriate S900 system variant.
Q: Does the CI920AB support HART protocol?
A: Yes, it supports HART over PROFIBUS DP-V1, allowing transmission of HART data from field devices.
Q: What is the weight of the CI920AB module?
A: The module weighs 0.13 kg (0.29 lbs.), making it lightweight for field installation.
Q: How do I configure redundancy with two CI920AB modules?
A: Use two modules with identical firmware and follow the Release Notes for proper setup. The modules support line or media redundancy.
Q: Is the CI920AB compliant with environmental standards?
A: Yes, it meets RoHS (Directive 2011/65/EU) and WEEE (Directive 2012/19/EU) requirements.
