FAC Series Controllers support selectable BACnet or N2 field bus networking protocols. FAC Series Controllers feature an integral real-time clock and support time-based tasks, which lets these field controllers monitor and control schedules, calendars, alarms, and trends. FACs can continue time-based control and monitoring when offline for extended periods of time from a Metasys system network. FAC Series Controllers can also operate as stand-alone controllers in applications that do not require a network engine or for network applications where it is preferred to have the scheduling, alarming, and trending performed locally in the field controllers. The FAC2612 controller features line-voltage relay outputs, making this controller well suited for use in terminal units. The FAC2612-2 model uses a line-voltage power supply, eliminating the need for a 24 VAC transformer in line-voltage applications. A full range of FAC and FEC models combined with IOM or XPM models can apply to a wide variety of mechanical and electrical equipment control applications ranging from simple fan coil or heat pump control to advanced central plant management.
The FAC3613-0 model includes a fast persistence feature that facilitates data values to be held at a configurable value, up to once per second. Persistence refers to how often samples of data are stored locally. The fast persistence feature ensures that in the event of a problem, such as a loss of power, you can retrieve up to the rate that the data is persisted, minimizing the potential loss of data. When power is restored, previously persisted data, up to the rate of persistence, is still available and accessible. In the case of persistence configured for once per second, you risk losing only one second of data. Persisting data is essential for situations that require greater data accuracy and may include certain methods of utility data collection and billing. Attributes you can persist in the FAC3613-0 include Counter Input Present Value Attributes, Binary Input, Binary Output, Binary Value COS Counts, Active Time Attributes, and PID/PRAC tuning parameters.
Some controller models operate on BACnet/IP and BACnet/SC networks and integrate into Johnson Controls' and third-party systems. For example, the FAC4911 BACnet/IP model is BTL-listed as an Advanced Application Controller. This model has an integral real-time clock for scheduling, alarming and trending, and facilitates star and daisy chain network wiring topologies. Media Redundancy Protocol (MRP) ring-enabled support is available for the Metasys IP FAC4911 and IP VMA1930 controllers, which are connected by Cisco® technology. The controllers can be configured in a ring network and continue to communicate even if one controller or network segment within the ring network stops communicating. This provides network reliability by mitigating a single point of failure in the IP/Ethernet network wiring.