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Product Overview
The ABB INNIS21 is a Network Interface Slave Module used in ABB Bailey INFI 90 and Symphony Harmony control-system architectures. ABB identifies it as an “Infi-Net to Node Communication Interface,” providing the network interface required to connect control-system nodes to the INFI-NET communications architecture. ABB lifecycle documentation also identifies INNIS21 as the evolution path for earlier INNIS01 and INNIS11 modules.
This makes the module particularly relevant to legacy DCS communication networks where dependable node connectivity remains essential. It is generally maintained as a communication-system spare rather than a generic network card. Before replacement, the control-network architecture, associated termination hardware, node configuration, and module revision should be checked carefully. Personally, I would verify the complete installed communication path before approving a replacement, especially on long-running INFI 90 systems.
Technical Specifications — ABB INNIS21
| Parameter | Value |
|---|---|
| Product Model | INNIS21 |
| Manufacturer | ABB |
| Product Type | Network Interface Slave Module |
| System Family | Bailey INFI 90 / Symphony Harmony |
| Primary Function | Infi-Net to Node Communication Interface |
| Network | INFI-NET |
| Power | System supplied |
| Communication / Protocol | ABB Infi-Net communication architecture |
| Mounting | ABB system rack / module mounting unit |
| Typical Interfaces | Infi-Net and node communication interfaces |
| Dimensions (HxWxD) | Approx. 358.14 × 71.12 × 269.24 mm |
| Weight | Approx. 1.76 kg |
| Operating Temperature | Refer to applicable ABB hardware documentation |
| Compliance | System and application dependent |
ABB’s product documentation categorizes INNIS21 as a Network Interface Slave module, while ABB spare-parts material lists it as an “INNIS21, Infi-Net to Node Comm Interface.”
ABB INNIS21
Key Features and Benefits — INNIS21
- Provides node-level connectivity within ABB INFI-NET communication architecture.
- Designed for Bailey INFI 90 and Symphony Harmony control-system environments.
- Serves as the supported evolution path for earlier INNIS01/INNIS11 network interfaces.
- Suitable for strategic DCS spare-parts inventory.
- Supports maintenance of installed legacy communication infrastructure.
- Helps maintain network availability without replacing an entire controller architecture.
Communication modules deserve closer inventory control than ordinary I/O spares. A failed network interface can interrupt data exchange even when the connected controller and field I/O remain healthy.
Related Models
ABB INNIS01 — Earlier Infi-Net to Node Communication Interface used in legacy INFI 90 systems.
ABB INNIS11 — Later-generation predecessor supported in the same communication family.
ABB INNPM22 — Network processor module used with newer Symphony Plus communication architectures.
ABB INNIS21R — Refurbished version listed by ABB within its INFI 90 spare-parts program.
Installation and Maintenance — INNIS21
Before installation, identify the existing rack position, network connection, termination hardware, node configuration, and module revision. Record communication diagnostics before removing the existing unit whenever possible.
Use appropriate ESD protection when handling the electronics. Inspect connectors and network interfaces for contamination, corrosion, bent contacts, or mechanical damage. After installation, verify network status, node communication, controller diagnostics, and data exchange across the affected control network.
For warehouse storage, keep the module in anti-static protective packaging and maintain records for part number, revision, serial number, inspection status, and storage conditions.
Product Warranty — INNIS21
Warranty coverage depends on supplier terms and whether the unit is new, surplus, refurbished, or previously installed. For refurbished stock, confirm functional-testing scope and warranty duration before purchase. Critical DCS communication spares should preferably include documented inspection and test records.
The ABB INNIS21 should be released for field installation only after the INFI-NET architecture, node configuration, termination arrangement, and hardware compatibility have been verified.
