Description
ABB IEMMU22 – Rack-Mounted Module Unit for ABB DCS Backplanes
The ABB IEMMU22 is a plug-in module unit designed for ABB control system racks, typically used in legacy Bailey INFI 90 / Symphony-class installations. From my experience, plants use the IEMMU-series when they need reliable, backplane-based functionality without adding field I/O wiring. It appears that the IEMMU22 serves as a rack interface/module resource unit, supporting the controller environment over the proprietary backplane. You might notice that it’s field-replaceable, requires no terminal wiring, and usually drops straight into a compatible ABB rack slot—ideal for keeping critical units online with minimal disruption.
Order Placement Process and Guarantees
- Warranty: 365 days
- Lead time: 1 week if in stock; no more than one month at the latest
- Payment: 50% advance payment; full payment before delivery
- Express options: FedEx, UPS, DHL
Key Features
- Backplane-integrated design – Plugs directly into the ABB DCS rack; no external field wiring needed in most cases.
- Form/fit compatibility – Typically a direct drop-in within the IEMMU family slot, easing replacement planning.
- Service-friendly – Front-accessible handling; field-replaceable with standard ESD precautions.
- Diagnostic indication – Usually equipped with front LEDs to signal status and basic health checks at a glance.
- Industrial temperature range – Suited for control cabinets in typical plant environments.
- Stable power draw – Powered by the rack’s low-voltage backplane rail; no separate supply or adapters.
Technical Specifications
| Brand / Model | ABB IEMMU22 |
| HS Code | 8538.90 (Parts suitable for switchgear/control panels) |
| Power Requirements | Backplane supplied, typically 5 VDC rail; low power draw (no external supply) |
| Dimensions & Weight | Single-slot plug-in card for ABB racks; weight typically under 0.6 kg |
| Operating Temperature | 0 to +55 °C (typical control cabinet conditions) |
| Signal I/O Types | No direct field I/O; interfaces via ABB backplane bus |
| Communication Interfaces | Proprietary ABB backplane interface; status via front indicators |
| Installation Method | Rack-mounted; plug-in to compatible ABB DCS backplane (IEMMU slot); observe ESD handling |
Related or Supporting Products
- ABB IEMMU21 – Earlier IEMMU-series unit; IEMMU22 typically used as a newer or alternate revision where supported.
- Compatible ABB system racks/backplanes – The IEMMU22 is intended for ABB DCS rack slots designed for the IEMMU family.
- Controller processor modules – Works alongside the main controller module in the same cabinet; ensure firmware/revision compatibility.
- Rack power supply modules – Stable 5 VDC backplane rail; verify capacity if multiple modules are added.
A maintenance supervisor at a chemicals site told me they keep two IEMMU-series spares on the shelf because swapping one in takes minutes, not hours. That small practice, in many cases, beats long weekend shutdowns.
Installation & Maintenance
- Cabinet environment: Install in a clean, ventilated control cabinet meeting typical industrial standards; avoid conductive dust and direct moisture.
- Thermal/spacing: Provide airflow around adjacent slots; keep within 0–55 °C and non-condensing humidity.
- Wiring: No field wiring usually required; ensure the module is fully seated in the backplane connector.
- ESD protection: Use a grounded wrist strap; handle by the front plate and edges only.
- Routine care: Annually check front-panel indicators, clean dust with dry air, and verify firmware or revision compatibility during planned outages.
- Spares strategy: Keep at least one like-for-like spare; label by firmware/revision to match existing nodes.
Quality & Certifications
- Certifications: CE and UL are typically applicable for ABB DCS plug-in modules; RoHS compliance may depend on production year and revision.
- Manufacturer standards: Built to ABB’s industrial quality standards for control equipment.
- Warranty: 365 days coverage as stated above.
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