Many different devices can function as consoles in an MVS™ system if they are specified as consoles in a CONSOLxx parmlib member. If the console is allocated to a subsystem — CONSOLE DEVNUM(SUBSYSTEM) — there is no corresponding device definition in the IODF. You should familiarize yourself with subsystem consoles if your configuration includes them; some of them can affect MVS operations in important ways. It is called a subsystem-allocatable console and is defined to the subsystem.
CONSOLE DEVNUM(SUBSYSTEM)