ABB IMQRS22 – Redundant Serial Interface Module for Symphony/INFI 90 Systems

The ABB IMQRS22 is a redundant serial communications module designed for ABB Symphony/INFI 90 and Harmony-based control systems. From my experience, it’s typically used to bridge third‑party serial devices—such as analyzers, weigh scales, drives, RTUs, or legacy OEM panels—into the distributed control system without compromising on uptime. One thing I appreciate is how it handles redundant channels and recovery gracefully, which, in many cases, means fewer nuisance trips and less time spent on the console after a switchover.

Plants often drop IMQRS22 into brownfield cabinets where serial links are still critical. You might notice that the diagnostics and isolation seem to be tuned for industrial noise, so you get stable comms even when the MCC is not exactly quiet. A maintenance lead at a metals plant told us their swap to IMQRS22 cut serial link alarms by more than half compared with their prior interface, largely because of better channel health reporting and cleaner failover behavior.

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• Warranty: 365 days
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• Packing: ESD-safe packaging with shock protection for rack-mount modules

Key Features

• Redundant serial channels: Designed for high availability; automatic switchover helps maintain comms during a channel fault.
• Multi-protocol serial connectivity: Suits common RS‑232/RS‑422/RS‑485 device links used in process plants and utilities.
• Robust isolation and noise immunity: Industrial-grade isolation typically reduces serial errors in high-EMI environments.
• Integrated diagnostics: Health/status indications make it easier to troubleshoot cables, port settings, and field power issues.
• Tight DCS integration: Interfaces with ABB Symphony/INFI 90/Harmony backplanes for deterministic control data exchange.
• Field retrofit friendly: Standard rack form factor and wiring approach shorten changeover time during turnarounds.
• Lifecycle support: Common spare in brownfield ABB fleets; usually available as refurbished or new-surplus for fast recovery.

Technical Specifications

Related or Supporting Products

• IMQCM04 – Quad-communication module often paired for network-side interfacing; more channel density in some setups.
• INICT12 – Network interface module for linking INFI-NET segments; helps when you need plantwide distribution.
• INNIS21 – Network interface (slave) for subsystem integration; typically used for host or gateway roles.
• IMDSI14 / IMDSO14 – Digital input/output modules when serial-connected devices also need discrete I/O handshakes.
• INNPM22 – Power supply module for ABB racks; keep a spare if you run redundant comm modules like IMQRS22.

If you’re replacing a legacy serial link card, IMQRS22 is usually the straight swap within ABB racks; when migrating from third‑party gateways, IMQCM04 or INICT-series modules might be the better match, depending on protocol scope.

Installation & Maintenance

• Cabinet & environment: Mount in a clean, ventilated control cabinet (NEMA 12 / IP54 or better). Maintain airflow around rack slots.
• Grounding & shielding: Use shielded twisted pairs for RS‑422/485; terminate shields at a single, clean ground point to reduce noise.
• Wiring practices: Keep serial runs away from VFD outputs and contactor lines; for RS‑485, apply proper termination and biasing.
• Configuration: Match baud rate, parity, stop bits, and addressing to each field device. Save a known-good configuration backup.
• Safety: De-energize the rack slot before insertion/removal unless your site procedures support live swap; observe ESD precautions.
• Routine checks: Inspect connectors quarterly; verify channel diagnostics; clean dust from the rack with dry air; review firmware notes during planned outages.
• Spare strategy: Keep at least one tested IMQRS22 on the shelf for critical production cells; this typically shortens MTTR.

Quality & Certifications

• Certifications: CE and UL for industrial control equipment are typical for ABB modules of this class.
• Materials compliance: RoHS status can vary by manufacturing date for installed base units; we can verify lot-specific details upon request.
• Warranty: 12 months from delivery (365 days) under normal industrial use.
• Testing: Each unit is function-checked prior to dispatch; full traceability and test reports available in most cases.

If you’re tying in serial analyzers that must stay online during cutovers, the IMQRS22’s redundant pathing tends to pay for itself fast. We can help match the exact port configuration and cabling so your commissioning team spends more time validating signals and less time chasing framing errors.