1. Product Overview

ABB INNIS21 is a high-performance dedicated network interface submodule designed exclusively for ABB Symphony Plus and Infi 90 (Harmony Rack) Distributed Control Systems (DCS). As a core communication component in ABB's flagship industrial automation solutions, it serves as a reliable gateway to achieve seamless real-time data interaction between system controllers, field devices, and the Infi-Net (Cnet) plant-wide control bus. Engineered for complex industrial process control, this module provides stable, low-latency communication, ensuring uninterrupted data transmission and system interoperability in harsh operating environments.
Built with industrial-grade hardware and compliant with global industrial standards, the INNIS21 integrates advanced communication technologies to support flexible networking and high system compatibility, making it an indispensable part of modern DCS network architectures in critical process industries.

2. Core Features & Functional Advantages

• High-Speed Communication Support: Equipped with two RJ45 Ethernet ports (10/100 Mbps full-duplex) integrated with a 2-port switch, enabling fast and efficient data transmission without additional external switching equipment. It supports adjustable communication rates for Infi-Net (Cnet): 10 Mbaud, 2 Mbaud, and 0.5 Mbaud, adapting to different system networking requirements.
• Multi-Protocol Compatibility: Natively supports the ABB Infi-Net (Cnet) protocol, and is compatible with mainstream industrial communication protocols (including Modbus TCP/RTU, PROFINET Class B, and EtherNet/IP), ensuring smooth integration with third-party devices, upper computer systems, and peripheral automation equipment.
• Redundant Design & High Reliability: Supports dual-network redundancy configuration for both Ethernet and Infi-Net bus, with automatic switchover in case of link failure to eliminate single points of failure and maximize system uptime. It also features hot-swap capability, allowing on-line replacement without shutting down the entire control system, minimizing unplanned downtime.
• Flexible Network Topology: Supports daisy-chain, star, and ring network topologies, providing high flexibility for system expansion and on-site networking design, suitable for both small-scale control units and large-scale plant-wide DCS networks.
• Intelligent Diagnosis & Monitoring: Built-in LED status indicators on the module panel clearly display power status, operation status, network activity, and fault alarms, facilitating quick on-site troubleshooting. It also supports remote diagnosis functions, enabling real-time monitoring of module performance and communication status from the control room.