FX-PC controllers have different numbers and types of onboard I/O than legacy N2 controllers. Which replacement FX-PC you select depends on how the legacy N2 controller was applied in the field and how many I/Os were actually used by the legacy N2 controller. For more information, see Specific device differences and considerations to understand the onboard I/O differences between legacy N2 controllers and FX-PC controllers.
FX-PC controllers feature flexible input interfaces, allowing these controllers to support most of the same sensors supported. However, some room sensors (for example, TE-6100-11/12, TE-67xx, or TE-67xx) that are used with legacy N2 controllers feature modular (phone) jack connections. These sensors require adaptation for use with the FX-PC controllers. See Specific device differences and considerations.