The ABB INNIS21 Network Interface Module serves as the primary communication entry point for nodes operating on the Cnet network within Symphony and INFI 90 architectures. Working in tandem with the INNPM22 processor module, it establishes a reliable, high‑speed data path between local nodes and the broader control network.
Technical Specifications
Manufacturer: ABB
Model:INNIS21
Product Type: Network Interface Module
Power Requirements: +5 VDC at 825 mA (4.1 W) or +5 VDC at 1.1 A (5.5 W)
Communication Rates: Supports 10 Mbaud, 2 Mbaud, and 0.5 Mbaud Cnet speeds
System Capacity:
Up to 62,000+ nodes across the full Cnet system
Up to 250 Cnet‑to‑Cnet interface nodes
Up to 250 nodes per network segment (Cnet‑to‑HCU or Cnet‑to‑computer combinations)
Architecture:
Single‑slot PCB module for MMU installation
Dedicated I/O expander bus link to INNPM22
Microprocessor‑based communication circuitry
Function: Provides the intelligent interface between a node and the Cnet backbone
Weight: 2 kg
Shipping Weight: 3 kg
Compatibility: ABB Symphony, INFI 90, and Cnet‑based distributed control systems
Features
Cnet Front-End Role: Acts as the primary communication gateway for all Cnet interface modules
High Node Scalability: Supports extremely large distributed architectures
Deterministic Data Handling: Ensures predictable communication timing for critical control loops
Robust Network Integration: Enables any node to communicate with any other node within the system
Modular Installation: Fits standard MMU slots for easy replacement or expansion
Reliable Hardware Design: Industrial‑grade PCB and isolation practices for long‑term operation
Application Scenarios
Large‑scale distributed control systems in power generation, petrochemical, refining, and heavy industrial plants
Network expansion or modernization projects requiring high‑capacity Cnet communication
Replacement of legacy ABB network interface modules within Symphony/INFI 90 systems
FAQ
Q: Does the INNIS21 require the INNPM22 module to operate? A: Yes. The INNIS21 functions as the network interface, while the INNPM22 provides the processing and communication management.
Q: Can the INNIS21 support mixed communication speeds on the same network? A: It supports multiple baud rates, but network segments must be configured consistently for stable operation.
Q: Is the module hot‑swappable? A: No. It must be installed or replaced with the system powered down to ensure network integrity.
