Johnson Controls MS-FAC4911-0 Metasys BACnet/IP Controller
- Brand: Johnson Controls
- Model: MS-FAC4911-0 (Revision B)
- Series: Metasys Advanced Application Field Equipment Controller
Johnson Controls MS-FAC4911-0 Metasys Advanced Application Controller
The Johnson Controls MS-FAC4911-0 (Revision B) is a 28-point Advanced Application Field Equipment Controller (FAC) designed for the Metasys® system. This controller is made to work with BACnet®/IP and BACnet® Secure Connect (BACnet/SC) networks. It has advanced control logic for complicated HVAC systems and building automation. The MS-FAC4911-0 has a built-in real-time clock that lets it schedule, trend, and alarm on its own, so the system will still work even if the network goes down.
The MS-FAC4911-0 is one of the best Metasys field controllers. The FAC series has high-speed 100 Hz pulse counters and improved 15-bit resolution for precise analog sensing, which is not found in ordinary controllers. Revision B of this model has 28 I/O ports built in, including universal inputs and adjustable outputs. This makes it one of the most flexible controllers in the Johnson Controls catalog for managing central plants and big air handling systems.
Specifications
| Specification | Details |
|---|---|
| Supply Voltage | 24 VAC (20–30 VAC), 50/60 Hz, Class 2 |
| Power Consumption | 14 VA Maximum |
| Communication Protocol | BACnet/IP, BACnet/SC |
| Ethernet Ports | 2 x RJ-45 (Integral Switch for Daisy-Chaining) |
| Total I/O Points | 28 Points |
| Universal Inputs (UI) | 10 (0-10 VDC, 4-20 mA, 0-600k ohm, Dry Contact) |
| Binary Inputs (BI) | 6 (Dry Contact or 100 Hz Pulse Counter) |
| Analog Outputs (AO) | 4 (0-10 VDC or 4-20 mA) |
| Binary Outputs (BO) | 4 (24 VAC Triac) |
| Configurable Outputs (CO) | 4 (0-10 VDC or 24 VAC Triac) |
| Processor/Memory | 16 MB Flash Memory |
| Mounting | 35 mm DIN Rail or Screw Surface Mount |
| Ambient Operating Temp | 0°C to 50°C (32°F to 122°F) |
Applications
- Central Plant Management: Managing the order in which chillers, boilers, and cooling towers work.
- Large Air Handling Units (AHUs): They control complicated HVAC logic that includes CO2 levels, humidity, and variable speed drives.
- Marine and Industrial Settings: Great for keeping the engine room cool and well-ventilated on ships where BACnet/IP reliability is very important.
- Retrofit Projects: Putting in new, faster IP-based infrastructure to replace obsolete N2 or MS/TP controllers.
- Standalone System Control: Running mechanical rooms that are far away and can have network problems.
Expert’s Guide:
As a marine engineer, I’ve seen these units perform exceptionally well in high-vibration and demanding maritime environments. However, the MS-FAC4911-0 is a high-speed IP controller; ensure your network switch is industrial-grade and supports the traffic load of BACnet/IP.
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