What Is the ABB CI873A?
When your industrial network demands reliable, high-speed communication between controllers and external Ethernet devices, the ABB CI873A delivers a robust solution. This AC 800M communication interface connects seamlessly using the EtherNet/IP protocol, ensuring real-time data exchange in demanding automation environments. The CI873A works exclusively with System 800xA versions 6.0.3.3, 6.1.1, and subsequent releases, and supports up to six redundant pairs of CI873A modules from version 5.1 FP4. Its compact design integrates CEX-Bus logic, a communication unit, and a DC/DC converter that draws power from the +24 V supply through the CEX-Bus.
Technical Specifications Breakdown
Understanding the key parameters of the CI873A helps you assess its fit for your system. The module operates at a transmission speed of 10/100 Mbit/s, ensuring compatibility with standard industrial Ethernet networks. It functions as a master device, supporting both EtherNet/IP and DeviceNet protocols. The CI873A consumes a typical 160 mA from a 24 V supply, making it energy-efficient for continuous operation. Its operating temperature range spans +5 to +55 °C (+41 to +131 °F), while storage temperature extends from -40 to +70 °C (-40 to +158 °F). The module is rated IP20 for protection against solid objects and is certified for hazardous locations per UL 60079-15 and cULus Class 1, Zone 2.
Industry Applications
In process industries such as oil and gas, chemical, and power generation, the CI873A provides a critical link between AC 800M controllers and remote I/O or drives over EtherNet/IP. For example, in a refinery, the CI873A enables redundant communication pairs to maintain uptime even if one module fails. Its support for hot swap allows maintenance without shutting down the entire system, reducing costly downtime. The module's G3 corrosion protection (compliant with ISA 71.04) makes it suitable for harsh environments with corrosive gases.
Installation & Setup Guidance
Mount the CI873A on a TP867 baseplate, which provides two RJ45 Ethernet connectors. Only the CH1 connector is used, supporting 100 Mbps. Ensure the baseplate is properly grounded and the +24 V supply is stable. The module automatically draws power via the CEX-Bus, so no separate power wiring is needed. When configuring the system, verify that your System 800xA version is 6.0.3.3 or later. For redundant setups, pair two CI873A modules and enable redundancy in the controller software. Always follow the manufacturer's guidelines for safe installation.
Maintenance & Reliability
To maximize the service life of the CI873A, perform periodic inspections of the RJ45 connectors for dust or corrosion. The module's IP20 rating means it should be installed in a clean, dry cabinet. Check the operating temperature stays within +5 to +55 °C to prevent thermal stress. Since the CI873A supports hot swap, you can replace a faulty unit without powering down the entire rack, minimizing production interruptions. Regular firmware updates, when available, can improve protocol compatibility and security.
Compatibility & Integration
The CI873A is designed for the ABB AC 800M controller family and integrates with System 800xA. It communicates via EtherNet/IP and DeviceNet, acting as a master. The module supports up to 12 units on the CEX bus, allowing flexible system expansion. It works with HI controllers and provides module redundancy for critical applications. The CI873A is also certified with marine certificates from DNV-GL, with pending approvals from ABS, BV, and LR, making it suitable for offshore and marine automation.
Buying Guide & Purchasing Advice
Before purchasing the ABB CI873A, confirm your system software version is compatible (System 800xA 6.0.3.3 or later). Verify the article number: 3BSE092695R1. Ensure you have a TP867 baseplate and the necessary CEX-Bus backplane. For redundant configurations, order two modules. At SpareTechPLC, we stock genuine ABB CI873A modules with full traceability. Contact our team to check current lifecycle status and availability before ordering.
Frequently Asked Questions
Q1: Can the CI873A be used with System 800xA 5.1?
A: The CI873A supports redundant pairs from version 5.1 FP4, but the module itself requires System 800xA 6.0.3.3 or later for full functionality.
Q2: Does the CI873A support line redundancy?
A: No, the CI873A does not support line redundancy. It does support module redundancy for fault-tolerant operation.
Q3: What is the maximum number of CI873A units on a CEX bus?
A: You can install up to 12 units on a single CEX bus.
Q4: Is the CI873A hot-swappable?
A: Yes, the CI873A supports hot swap, allowing replacement without powering down the system.
Q5: What certifications does the CI873A hold for hazardous locations?
A: It is certified to UL 60079-15 and cULus Class 1, Zone 2, AEx nA IIC T4, ExnA IIC T4Gc X.
