ABB IEMMU22 Module Mounting Unit

Configured for direct physical/electrical execution in ABB Bailey Infi 90 networks, the ABB IEMMU22 (IEMMU22 Module Mounting Unit) provides mechanical chassis housing and backplane power distribution across process automation systems. The hardware assembly routes high-speed Controlway and I/O Expander Bus signals directly between installed control processors, communication adapters, and field interface cards.

Hardware Specifications

Backplane Bus Architecture & Slot Expansion

Engineered for integration into distributed control systems, the IEMMU22 chassis contains a heavy-duty backplane PCB handling high-speed bus communication velocity. The backplane traces isolate Controlway system communications from internal I/O expansion signals, eliminating data collisions during high-density I/O scan routines. Built-in power distribution planes carry stable +5 VDC and +/-15 VDC supply rails across all 22 slots, while rigid card guides maintain firmware flash compatibility and physical pin alignment during hot-swapping or card replacement procedures.

Frequently Asked Questions

Q: How does the IEMMU22 chassis handle internal module cooling under full load conditions?

A: The physical structure relies on open vertical airflow paths for passive convection cooling. For high-density module configurations drawing maximum backplane power, external fan assemblies can be mounted directly above or below the 19-inch rack frame.

Q: What electrical power rails are distributed across the backplane slots of the IEMMU22?

A: The integrated backplane routes primary +5 VDC logic power alongside +/-15 VDC analog bias voltages from central system power modules directly to individual card edge connectors.

Field Installation Guidelines

Mount the IEMMU22 frame directly into a standard 19-inch instrument enclosure, using four M6 mounting screws to fix the front mounting ears to the rack vertical rails. Verify that cabinet grounding straps connect the steel chassis to the main equipment ground busbar to establish an effective Faraday shield and eliminate stray ground loops. When inserting functional processor or I/O cards, align the module circuit boards with the upper and lower guide channels before pushing the module fully home to mate with the rear backplane connectors. Ensure all external power supply feeds and system cables maintain a minimum physical clearance of 30 cm from high-voltage AC lines.