ABB INNIS21 Infi-Net NIS Module Symphony DCS

Description

Product Introduction

The ABB Bailey INNIS21 is a Network Interface Slave (NIS) module built for INFI 90 and Symphony Harmony Distributed Control Systems (DCS). Operating as a two-board set paired alongside a Network Interface Master (such as the INNPM12 or INCPM01), the INNIS21 manages the physical and data-link layer tasks of the redundant INFI-Net communication ring. Facilities count on this card to keep process controllers tightly synchronized across plant-wide loops.

By taking over low-level token passing, packet framing, and hardware error detection, the INNIS21 frees up the master processor card to execute high-level communications and data routing. This split-architecture design prevents heavy network traffic spikes from bogging down node-to-node messaging across critical plant loops.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

It is 3:10 AM on a freezing winter night. A combined-cycle power station loses link redundancy on Loop B of its primary INFI-Net ring. Alarm counters skyrocket, and the central control room loses live telemetry from a HRSG (Heat Recovery Steam Generator) node. The technician on shift opens the local cabinet, spots a dark Loop B status LED on the active INNIS21 card, powers down the slot, swaps in a pre-tested replacement, verifies the dip switches match, and restores full dual-ring redundancy before a second network fault trips the steam turbine.

• Power Generation Facilities – Plant-Wide DCS Ring Interconnect – Transmits continuous loop control data between boiler controllers, turbine governors, and BOP systems.
• Chemical Processing Units – High-Availability Redundant Communications – Handles dynamic failover between Loop A and Loop B without dropping active process control loops.
• Oil Refineries – Distributed Process Control Nodes – Connects remote Process Control Units (PCUs) over long cable runs using fiber-optic or coaxial modem links.
• Pulp & Paper Plants – Continuous Digester Coordination – Maintains microsecond-level synchronization across sprawling process control racks.

Transparency SOP: Quality Assurance & Testing

We don’t just ship boxes; we test them on actual ABB Bailey MMU racks.

1. Inbound Inspection: Physical audit examining trace condition, backplane connector pin alignment, edge connector gold plating, and front plate latching mechanism.
2. Live Rig Testing: Inserted into an INFI 90 MMU backplane joined with a matching INNPM12 master module on an active dual-ring INFI-Net test network.
3. High-Load Loop Polling: Multi-hour traffic load test driving continuous token passing and packet transmission across both Loop A and Loop B ports to verify zero packet drop.
4. Dip Switch & Logic Verification: Board address switch logic and firmware revision chips verified against OEM documentation.
5. ESD Safe Packaging: Cleaned with non-conductive solvent, double-bagged in static shielding material, and packaged using custom-cut high-density foam inserts.

INNIS21

INNIS21

The Veteran’s Tech Trap Guide (Crucial Value-Add)

• ⚠️ Do NOT Separate the Master/Slave Pair While Powered!

  The slave card works in tandem with an INNPM master module via an internal side-bus ribbon cable or backplane bridge. Attempting to pull or insert the card while the adjacent master board is energized can lock up the entire node bus or damage the shared bus transceiver ICs.

• ❗ Match Your Board DIP Switch Settings EXACTLY

  Before sliding your replacement into the rack, check the onboard DIP switch banks against the failed card. These switches define hardware node parameters and termination settings. If set incorrectly, the card will fail to join the INFI-Net token ring or create ring-break errors. Take a photo of the original card’s DIP switches before extraction. Trust me.

• ⚠️ Check Cable Shielding on NTCL Termination Units

  If your replacement board repeatedly flags Loop A or Loop B framing errors after installation, check the shield drain wires on the NTCL01/NTCL02 termination unit behind the rack. Ground loops or ungrounded coax shields introduce electrical noise that looks like a faulty NIS card.

• ❗ Inspect the Internal Flat Cable Connector

  When reassembling the and its paired NPM card into the rack, make sure the ribbon cable bridging the two boards is fully seated and locked. A loose cable header will trigger an immediate processor halt on boot.

Frequently Asked Questions (FAQ for Conversion)

Q: Is the hot-swappable?

A: No. Removing or inserting an module while the backplane slot is powered can cause network glitches across the INFI-Net ring and corrupt communication on the paired NPM master module. Always place controlled loops in manual and turn off slot power before removal.

Q: What is the main difference between and older INNIS01/INNIS11 modules?

A: The is an upgraded, higher-reliability network interface slave board featuring improved component integration, lower power consumption, and better transient noise immunity compared to legacy INNIS01 and INNIS11 models. It serves as a direct functional replacement in most Symphony and INFI 90 setups.

Q: Can the operate as a standalone module?

A: No. The handles physical network layer communications only. It must be paired with a Network Interface Master card (such as an INNPM11, INNPM12, or INCPM01) to function as a complete INFI-Net node.

Q: Are these units brand new from ABB?

A: ABB has discontinued the legacy INFI 90 / Symphony Harmony hardware line. Our inventory consists of fully bench-tested New Surplus (unused plant spares) and refurbished units pulled from working system upgrades.

Q: What warranty coverage comes with this module?

A: Every card includes a full 12-month replacement warranty. If the module experiences hardware or network loop communication faults within one year of delivery, we ship a replacement directly from our warehouse stock.