Legacy DX-9100 Extended Digital Controllers supported an optional XT Extension Module with associated XP Expansion I/O Modules to expand the DX-9100's input and output interfaces. CGM, FAC, and FEC equipment controllers do not support the XT/XP modules. Instead, for I/O expansion, the equipment controllers support the SA bus for connecting M4-XPM or IOM Expansion I/O modules.
When using a CGM, FAC, or FEC equipment controller to replace a DX-9100 controller, you must also replace the XT/XP modules. Either use available I/O interfaces on the equipment controller or add M4-XPM or IOM Expansion I/O modules.