Description
Johnson Controls Metasys Input/Output Expansion Module
Model: MS-IOM3733-0 | Revision A | FC Bus Network Field Expansion Block
Product Overview
The genuine Johnson Controls MS-IOM3733-0 Metasys IOM Expansion Module (Revision A) delivers robust, high-density Input/Output scalability for modernized building automation systems and advanced HVAC field control networks. Operating on a standard 24 VAC power supply, this flexible point multiplexer integrates seamlessly via the master Field Controller (FC) Bus to significantly scale your facility monitoring footprint. Outfitted with 17 total point configurations—including 8 versatile Universal Inputs, 4 precision Analog Outputs, and 5 rugged Relay Outputs rated at 2 Amps—it provides an efficient, dependable hardware solution for multi-point equipment monitoring, mechanical overhauls, and drop-in panel maintenance.
Technical Specifications
| Parameter | Specification Details |
|---|---|
| Brand / Manufacturer | Johnson Controls (Genuine Original Equipment) |
| Model Identifier | MS-IOM3733-0 |
| Hardware Revision | Revision A (Rev A) |
| Operating Voltage Input | 24 VAC nominal, 50/60 Hz, Class 2 Power Source |
| Universal Inputs (UI) | 8 Channels (Supports RTD, Thermistor, Current/Voltage, or Dry Contacts) |
| Analog Outputs (AO) | 4 Channels (Configurable 0-10 VDC or 4-20 mA Command Signals) |
| Relay Outputs (RO) | 5 Channels (Rated up to 30 VAC / 30 VDC, 2 Amps Maximum Load) |
| Network Communications | RS-485 Serial Interface via Metasys FC Bus Protocol |
| Primary Applications | Metasys Field Node Expansion, Air Handling Units (AHUs), Multi-Stage Fan Control, Industrial Plant Monitoring |
Key Features & Operational Benefits
- High Point-Density Expansion: Adds 17 diverse field points over a single network address, minimizing panel wiring clutter and extra controller hardware overhead.
- Versatile Universal Inputs: Fully software-configurable loops allow smooth transitions between analog tracking elements and digital switch indicators without manual modifications.
- Integrated Address Dials: Easy-to-use rotary switches allow quick decimal addressing configurations right on the sub-panel, shortening replacement setup steps.
- Seamless Metasys Integration: Connects perfectly into existing FC Bus trunk architectures, reporting diagnostics directly to Metasys network engines (NAE/SNE/NCE).

