Description
Overview
The ABB IEMMU21 is a robust module mounting unit designed to house standard INFI 90 OPEN system modules and the BRC-100 Harmony Bridge Controller within the Symphony Plus architecture. Engineered for rear-mount cabinet configurations, it offers both mechanical support and electrical distribution for complex industrial control systems. Its open-frame design ensures optimal airflow, while its modular backplane enables flexible signal routing and power delivery.
Key Features
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Supports up to 12 system modules, including BRC-100
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Sheet metal chassis with card guides and captive latches for secure module installation
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Multilayer backplane PCB with dipshunt sockets, jumpers, and connectors
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I/O expander bus, module bus, and Controlway signal distribution
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Regulated power supply distribution: +5 V, +15 V, –15 V
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Segmented bus architecture for increased density and cost efficiency
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Ribbon cable interconnects (2.54 mm center spacing) in two lengths: 38 mm and 171 mm
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Rear-mount chassis design for cabinets without primary power distribution
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Compatible with Modular Power System II
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Tool-less module installation/removal for fast maintenance
Technical Specifications
| Specification |
Details |
| Manufacturer |
ABB |
| Part Number |
IEMMU21 |
| Series |
Symphony Plus |
| Type |
Module Mounting Unit |
| Voltage Distribution |
+5 V, +15 V, –15 V |
| Module Capacity |
Up to 12 modules |
| Dimensions |
411.48 mm × 505.46 mm × 259.08 mm |
| Weight |
4.8 kg |
| Mounting Standard |
483 mm (19-inch) Elsag Bailey cabinet |
| Primary Power Distribution |
Optional (not included in rear-mount config) |
Applications
The IEMMU21 is ideal for industrial control systems requiring modular scalability, reliable signal distribution, and efficient power management. It’s especially suited for installations using INFI 90 OPEN modules and BRC-100 controllers, where cabinet space, airflow, and maintenance accessibility are critical.
