Description
Johnson Controls MS-NAE5510-3U
Product Overview
The Johnson Controls MS-NAE5510-3U is a Metasys NAE55 Network Automation Engine configured for smoke-control applications. Unlike a conventional field controller, it operates at the supervisory level of a building automation architecture. The engine manages communications between higher-level Metasys software and field-level controllers, while providing network coordination for N2 Bus or BACnet MS/TP installations. Johnson Controls specifies two RS-485 trunks, with either two N2 Bus trunks, two BACnet MS/TP trunks, or one of each, with up to 100 devices supported per trunk.
From an engineering standpoint, the Johnson Controls MS-NAE5510-3U needs to be treated as a system-specific supervisory computer rather than a generic PLC CPU. The unit includes one Ethernet interface, two optically isolated RS-485 ports, two RS-232-C ports, and two USB 2.0 ports. Its published hardware configuration includes a 1.46 GHz Intel Atom E3815 processor, 16 GB flash nonvolatile memory, and 2 GB DDR3 SDRAM. The controller operates from a dedicated nominal 24 VAC supply and is specified for 0 to 50°C ambient operation.
The critical distinction is the “-3U” designation. Johnson Controls documents this version for UL 864 smoke-control applications at Metasys Release 8.1, with an OEM version of Microsoft Windows Embedded Standard 7 with SP1. The manufacturer specifically states that the UL 864 UUKL/UUKLC listing applies to the MS-NAE5510-3U with Release 8.1 software. That software/listing relationship matters during a smoke-control replacement; simply installing a physically similar NAE55 does not establish regulatory equivalence.
For a legacy system, the Johnson Controls MS-NAE5510-3U can be useful as a direct hardware replacement candidate when the existing installation, application database, firmware/software release, network topology, and smoke-control documentation all align. Do not treat the part number alone as sufficient evidence of compatibility.
Product Introduction
A supervisory engine can look like a small industrial computer, but replacement work is rarely just a hardware swap. The MS-NAE5510-3U combines Metasys supervisory functions with two isolated RS-485 trunks and dedicated smoke-control certification requirements.
For a DCS/PLC engineer moving into building automation, think of it as the network-level coordinator rather than the field I/O controller. It is particularly relevant to Metasys system upgrades, legacy NAE55 replacement, and UL 864 smoke-control maintenance.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | MS–3U |
| Manufacturer / Brand | Johnson Controls |
| Product Series | Metasys NAE55 Network Automation Engine |
| Product Type | Network Automation Engine / Supervisory Device |
| Primary Application | Metasys building automation and smoke-control supervision |
| Power Supply | Dedicated nominal 24 VAC, 50/60 Hz |
| Acceptable Power Range | 20–30 VAC |
| Maximum Power Consumption | 50 VA |
| Processor | 1.46 GHz Intel Atom E3815 |
| Nonvolatile Storage | 16 GB flash |
| Operating Memory | 2 GB DDR3 SDRAM |
| Ethernet | 1 × 10/100/1000 Mbps RJ-45 |
| RS-485 | 2 × optically isolated ports |
| RS-485 Baud Rates | 9.6, 19.2, 38.4, 76.8 kbaud |
| RS-232-C | 2 × 9-pin serial ports |
| USB | 2 × USB 2.0 |
| Supported Field Trunks | Two N2 Bus, two BACnet MS/TP, or one N2 + one BACnet MS/TP |
| Device Capacity | Up to 100 devices per N2/BACnet MS/TP trunk |
| Operating Temperature | 0 to 50°C |
| Operating Humidity | 10–90% RH, 30°C maximum dew point |
| Storage Temperature | -40 to 70°C |
| Enclosure Protection | IP20 |
| Mounting | Flat surface or dual 35 mm DIN rail |
| Dimensions | 226 × 332 × 96.5 mm including mounting feet |
| Shipping Weight | Approx. 2.9 kg |
| Data Protection Battery | MS-BAT1010-0, 12 V, 1.2 Ah rechargeable gel cell |
| Smoke-Control Software | Metasys Release 8.1 for UL 864 smoke-control listing |
| Smoke-Control Standard | UL 864 10th Edition UUKL/UUKLC, applicable configuration |
| BACnet | BTL-listed B-BC/B-BBMD, Protocol Revision 15 documentation |
| Operating System | OEM Microsoft Windows Embedded Standard 7 with SP1 for the documented Release 8.1 smoke-control configuration |
The published specifications come from Johnson Controls documentation; software release and certification statements should be checked against the actual unit’s nameplate and installed image before a regulated replacement.
MS-NAE5510-3U
Major Features / Practical Advantages
Supervisory-Level Metasys Architecture
sits above field controllers in the Metasys architecture. It can coordinate networks containing equipment controllers, legacy Metasys controllers, and other building automation devices rather than directly replacing individual field I/O modules. Johnson Controls describes NAE55 engines as providing network management and system-wide control and coordination.
Two Independent RS-485 Trunk Interfaces
Two optically isolated RS-485 ports provide the physical interface for the documented N2 and BACnet MS/TP arrangements. The supported architecture permits two N2 trunks, two BACnet MS/TP trunks, or one of each. This makes the exact trunk allocation important during replacement.
Practical Legacy-Network Capacity
Each N2 or BACnet MS/TP trunk can support up to 100 devices under the documented configuration. N2 and MS/TP are not Ethernet networks, and their wiring rules are different. Johnson Controls specifies daisy-chain topology and specific termination requirements rather than unrestricted star wiring.
Gigabit-Capable Ethernet Interface
The NAE55 hardware provides a 10/100/1000 Mbps Ethernet interface through an RJ-45 connector. The Ethernet network is used at the supervisory/IP level, while the RS-485 ports handle field trunks. Keeping those two network layers conceptually separate makes commissioning and troubleshooting much easier.
Smoke-Control Specific Configuration
The most important feature of the -3U version is not processor speed or memory capacity. It is its intended smoke-control configuration. Johnson Controls documents as UL 864 10th Edition UUKL/UUKLC equipment when operating with the specified Release 8.1 configuration.
Nonvolatile Data Protection
The engine uses flash storage for the operating system, configuration data, and operations data. A rechargeable 12 V, 1.2 Ah data-protection battery is specified for power-failure data retention. Battery age therefore belongs on the procurement checklist, particularly when buying a surplus or previously installed unit.
Installation Flexibility
The housing can be mounted on a flat surface using its four mounting feet or on a dual 35 mm DIN rail. The IP20 enclosure means this is panel/control-room equipment, not a field-mounted weatherproof controller.
Engineering Reality: Software Matters
A replacement can power up normally and still be the wrong replacement. The application database, Metasys release, trunk configuration, smoke-control certification status, and associated site documentation all matter. Johnson Controls specifically identifies the -3U smoke-control configuration with Release 8.1, so procurement should not silently substitute the standard MS–3 and assume equivalent compliance.
Related Products
- — Standard network engine with broader third-party integration support and later Release 12.0 capability; not automatically equivalent to the smoke-control -3U configuration.
- MS-NAE5520-3 — model with LonWorks capability and broader trunk combinations; useful where LonWorks integration is required.
- — Earlier UL 864 smoke-control generation; useful as a legacy reference but has different processor, storage, and operating-system characteristics.
- — Earlier smoke-control NAE configuration supporting BACnet MS/TP trunks without the N2/BACnet combination of the later -3U.
- MS-NAE55xx-3 — General -3 family designation covering standard energy-management variants.
- MS-NAE35xx-2 — Smaller Metasys network-engine family intended for applications with different supervisory capacity requirements.
- MS-NXE85SW-0 — NAE85 software license for larger Metasys installations; architecturally different from the embedded hardware.
- MS-BAT1010-0 — Replacement data-protection battery specified for engines.
FAQ
Is a PLC?
No. It is a Metasys Network Automation Engine, functioning as a supervisory/network-management device. It is not a conventional PLC CPU with user-installed discrete and analog I/O modules.
What is the difference betw and MS–3?
The -3U is the smoke-control configuration. Johnson Controls documents with Release 8.1 for UL 864 10th Edition UUKL/UUKLC smoke-control applications. The standard MS–3 supports additional third-party integration options and Release 12.0 functionality.
Can I use a standard MS–3 as a replacement?
Not without engineering verification. Hardware similarity is not enough when the existing installation depends on the -3U smoke-control listing. Verify software release, application, trunk architecture, site certification requirements, and the applicable UL 864 documentation before making the substitution.
Does this unit support BACnet MS/TP?
Yes. supports two BACnet MS/TP RS-485 trunks, or one BACnet MS/TP trunk combined with one N2 Bus trunk. Up to 100 devices per supported trunk are documented.
Can I hot-swap ?
Do not assume hot-swapping. This is a powered supervisory engine with network and data-retention functions, not a conventional hot-swappable PLC I/O module. For a live smoke-control installation, follow the approved Johnson Controls shutdown, replacement, commissioning, and regulatory procedures.
Does run Windows?
The documented UL 864 smoke-control configuration uses an OEM version of Microsoft Windows Embedded Standard 7 with SP1 and Metasys Release 8.1. Do not infer that every hardware revision uses the same operating system.
Can I upgrade to a newer Metasys release?
This requires special care. Johnson Controls’ documentation distinguishes the -3U smoke-control configuration from the standard -3 models and ties the UL 864 smoke-control listing to Release 8.1. A software upgrade should therefore be evaluated against the applicable smoke-control listing rather than treated as an ordinary firmware update.
What should I verify before buying a replacement?
Verify the complete model number, hardware revision, installed Metasys release, smoke-control documentation, application database backup, RS-485 trunk arrangement, Ethernet configuration, battery condition, and physical condition. For a regulated smoke-control installation, also verify that the replacement path preserves the required UL 864 configuration.
Procurement Note
The is one of those components where “same model number” is only the beginning of the inspection. For a normal building-automation application, processor and memory specifications may dominate the purchase decision. For this model, the software image and smoke-control certification context are more consequential.
If purchasing New Surplus or previously installed equipment, request clear evidence of the nameplate, hardware revision, installed software release, battery condition, and successful power-up/communication testing. Do not assume that a unit described simply as an “” has the required -3U smoke-control configuration.
For an existing UL 864 installation, preserve the original application database and configuration before removing the installed engine. Confirm the N2/BACnet MS/TP topology and termination arrangement, then validate the replacement under the site’s approved smoke-control commissioning procedure. Johnson Controls specifically states that the -3U smoke-control listing applies to the Release 8.1 configuration, making certification and software verification a procurement requirement rather than an optional documentation exercise.
