What lands on the BOM line
The Mitsubishi RD78G4 is a 4-axis PLC expansion module sitting in the PLCs and Accessories class, filed as a PLC Expansion Module at the top-level PLCs & HMIs grouping.
Sourcing takeaway
For an MRO planner holding a spare slot or an integrator closing out a new line, the RD78G4 is a current-production expansion module quoted to order; pull the order code into the BOM and raise an RFQ to lock supply against the project schedule.