ABB IEMMU21 INFI 90 Multi-Function Bus Module

Description

Key Technical Specifications

Product Introduction & Supply Chain Strategy

The ABB Bailey IEMMU21 is a core Multi-Function Master Unit designed for ABB INFI 90 and Network 90 distributed control systems. Installed in Module Mounting Units (MMUs), it handles system bus orchestration, process logic execution, and high-speed data exchanges between local I/O cards and higher-level plant networks.

This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. Installing refurbished or pulled INFI 90 cards in critical boiler, turbine, or paper mill control loops introduces serious risks: degraded backplane transceivers, micro-cracks in solder joints from decades of thermal stress, and corrupted firmware chips. A bus error on a central DCS module can drop an entire process unit into an emergency trip, costing upwards of $50,000 in lost production. Sourcing genuine New Surplus inventory provides an immediate drop-in replacement, full operational service life, and complete peace of mind.

IEMMU21

IEMMU21

Installation & Configuration Guide

Stage 1: Pre-Installation (Prep & Safety)

1. Execute full Lock-Out/Tag-Out (LOTO) on the MMU power chassis and cabinet breaker feeds.
2. Put on a grounded ESD wrist strap connected to the cabinet frame ground before opening static-shielding packages or handling circuit boards.
3. Record all dip switch profiles, jumper block configurations, and address settings from the original IEMMU21 board.
4. Clean the MMU backplane card slot using dry compressed air to remove accumulated dust or particulate matter.

Stage 2: Removal

1. Unplug front faceplate communication cables and field network interface connectors.
2. Unfasten the top and bottom card locking screws securing the faceplate to the MMU mounting rail.
3. Pull the ejector handles outward to unseat the edge connectors from the backplane bus, then slide the card out along its guide tracks.

Stage 3: Installation (Clone & Seat)

1. Match all onboard DIP switch blocks and option jumpers on the new IEMMU21 to mirror the removed module exactly.
2. Align the IEMMU21 card with the top and bottom plastic guide channels in the designated MMU slot.
3. Slide the board inward until the rear pin connectors touch the backplane, then press the faceplate handles firmly to lock the module into place.
4. Tighten the top and bottom retaining screws to 0.5 N·m.

Stage 4: Power-On & Testing

1. Reconnect front panel bus cables and communication lines.
2. Restore power to the MMU power supply and observe the front faceplate LED sequence during initialization.
3. Confirm the green RUN status LED stays solid and no red ERR or bus fault lights illuminate.
4. Verify module online status and function block execution using Composer or WinCAD engineering software.

Firmware/Software Versions & Upgrade Notes

• System Compatibility: Compatible with ABB INFI 90, Network 90, and Symphony Harmony control architectures.
• Firmware Revision Alignment: Verify that onboard ROM firmware chip revisions match the system software version configured in your plant’s engineering workstation database.
• Configuration Safety: Swapping an IEMMU21 card with identical hardware and DIP switch settings allows automatic project logic downloads from redundant bus partners or host controllers. Never insert or pull an IEMMU21 module without verifying backplane power status.

Frequently Asked Questions (FAQ)

Is this ABB IEMMU21 card brand new or refurbished?

This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. Every module undergoes visual, power-on, and backplane communication checks prior to dispatch.

Why is New Surplus critical for Bailey INFI 90 control modules?

INFI 90 systems govern core process infrastructure in power generation and heavy industry. Refurbished or pulled cards often suffer from aged capacitors, bus transceiver degradation, and thermal wear from continuous 24/7 operations. Installing New Surplus ensures original factory silicon, zero prior heat cycles, and full system availability.

What is the role of the IEMMU21 in an INFI 90 cabinet?

The IEMMU21 operates as a multi-function processing unit that manages control logic, executes function codes, and routes data across the INFI 90 module bus (MMB) and expander bus (MEB).

Can I hot-swap the IEMMU21 while the MMU backplane is powered?

No. Power down the specific MMU slot or chassis section before removing or installing the IEMMU21. Hot-plugging master bus modules risks voltage transients that can corrupt backplane communications or damage sensitive CMOS logic ICs.

What documentation and warranty come with this module?

All New Surplus ABB IEMMU21 cards ship in anti-static ESD protective packaging with individual serial verification tags, a certified QC inspection report, and a full 1-year operational replacement warranty.