ABB Bailey NMMU02 Module Mounting Unit

The ABB Bailey NMMU02 Module Mounting Unit is an industrial-grade chassis engineered for securely housing ABB Bailey’s control system modules, including INFI 90, Harmony, and Symphony series components.

Designed to provide reliable mechanical support, stable electrical connections, and robust thermal management, the NMMU02 is ideal for both new installations and system expansions within distributed control environments.

With 8 module slots, the NMMU02 offers a compact alternative to the full-size NMMU01, making it suitable for smaller control rooms, space-constrained cabinets, or modular DCS architectures where flexible, scalable mounting options are needed.

The NMMU02 ensures consistent signal integrity through its INFI-NET-compatible backplane, providing dependable communication pathways for processor, I/O, and interface modules.

Its field-proven durability and ease of integration make it a popular choice across critical industries such as power generation, oil & gas, chemicals, pulp & paper, metals & mining, and many others.

Product Specifications

Applications

The ABB Bailey NMMU02 Module Mounting Unit is used across numerous industrial control applications, including:

• DCS Modular Chassis

  For small- to medium-scale INFI 90, Harmony, and Symphony control systems.

• Redundant Control System Configurations

  Used for hosting secondary or backup processor racks.

• I/O Segmentation

  Enables logical grouping of I/O modules for faster troubleshooting and maintenance.

• Special Purpose Racks

  For batch control, discrete sequencing, or specialty instrumentation modules.

• Space-Constrained Installations

  Perfect for control cabinets with limited vertical or horizontal space.

• Hybrid Legacy-Modern Systems

  Supports upgrades by mixing legacy and modern Bailey modules.

Product Advantages

• Compact Form Factor

  Smaller than the full-size NMMU01 — ideal for limited spaces.

• Field-Proven Reliability

  Trusted in thousands of control systems worldwide.

• Full Compatibility

  Works seamlessly with INFI 90, Harmony, and Symphony modules.

• Excellent Heat Dissipation

  Designed for passive convection cooling — no fans required.

• Ease of Installation

  Allows tool-free, hot-swappable module maintenance.

• Industrial Durability

  Compliant with IEC vibration and shock standards.

• Supports Flexible Architectures

  Enables creative DCS designs — from redundant systems to compact I/O hubs.

• CE and RoHS Certified

  Meets modern safety and environmental regulations.

• Low Total Cost of Ownership

  Minimal maintenance, long lifecycle, and compatibility with legacy systems.

• Scalable for System Growth

  Facilitates easy future expansion.

Frequently Asked Questions (FAQ)

1. How many modules can the NMMU02 support?

   The NMMU02 supports up to 8 standard ABB Bailey modules per unit.

2. Is the NMMU02 suitable for use in vibration-prone environments?

   Yes — the NMMU02 complies with IEC 60068-2-6 vibration standards, making it suitable for industrial environments with moderate vibration.

3. Can I mix Harmony and INFI 90 modules in the same NMMU02 unit?

   Yes — as long as the modules are compatible with the same INFI-NET backplane, you can mix Harmony and INFI 90 modules.

4. Does the NMMU02 have any built-in diagnostics?

   No — the chassis itself does not contain active diagnostic circuits, but it allows full diagnostics via the processor modules and control software.

5. What backplane type is used in the NMMU02?

   It uses an INFI-NET compatible backplane, ensuring seamless communication between modules.

6. What is the grounding method provided on the NMMU02?

   The unit includes an integrated ground bar with clearly marked bonding points to ensure proper grounding of the chassis and modules.

7. How is cable management handled for the NMMU02?

   The unit provides ample space at the rear for neat routing of power, I/O, and communication cables.

8. What certifications does the NMMU02 meet?

   The NMMU02 is CE marked and RoHS-compliant, meeting modern industrial safety and environmental standards.

9. How often should maintenance be performed on the NMMU02?

   Only visual inspection for dust, connection integrity, and ground bonding is recommended during scheduled DCS maintenance — typically every 12 to 24 months.

10. Can the NMMU02 be shipped fully populated with modules?

    Yes — many system integrators and OEMs will pre-configure and ship the NMMU02 fully loaded with tested modules, ready for installation.