The IOM Series expansion I/O modules have integral RS-485 MS/TP communications and integrate into the web-based Metasys system. IOMs can serve in one of two capacities, depending on where they are installed in the Metasys system. When installed on the Sensor/ Actuator (SA) Bus of an Advanced Application Field Equipment Controller (FAC), Field Equipment Controller (FEC), or VAV Modular Assembly (VMA) controller, the IOM expands the point count of these controllers. When installed on the Field Controller (FC) Bus, IOMs can be used as I/O point multiplexors to support monitoring and control from a Network Automation Engine (SNE) or Network Control Engine (SNC). The point multiplexor can also be useful for sharing points between other field controllers on the FC Bus using peer-to-peer connectivity.

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