CGM, CVM, and FEC family controllers are not physically identical to legacy N2 controllers and have a different mounting footprint. As a result, when you use these controllers to replace legacy N2 controllers, ensure that the intended mounting location, for example, if reusing the existing control panel, it has enough space to accommodate the replacement controller. See Specific device differences and considerations for specific dimensions for legacy N2 controllers and their suggested N2-capable equipment controller replacements.
Note: Depending on the I/O count used on the legacy N2 controller, two or more physical
controllers, for example, an FEC/IOM combination
may be needed to replace a single N2
controller.