The NZ2GN2B-60AD4: It belongs to the class of slice-style or rack-attached I/O/function blocks that sit next to the CPU on a Mitsubishi backplane, and it is identified to the system by its own order code rather than a slot number on the CPU itself.
Lifecycle and what the BOM can rely on
For a procurement line that needs continuity rather than a one-off spare, current production is the working assumption; the BOM can be specified against this code with the expectation that the factory channel is open. No last-time-buy window, PCN date, or official successor is recorded alongside this order code, so the prudent posture is to quote to order and re-check lifecycle at the next BOM freeze.