Key specs and what they mean for fit
The MR-J4-40A-RJ: The MR-J4 series uses SSCNET III/H communication. That means the amplifier expects a fiber-optic ring from a compatible Mitsubishi controller (e.g., iQ-R, iQ-F motion modules, or a dedicated motion CPU). It is not a standalone drive with analog or pulse-train input — the motion profile is generated by the controller and sent over the fiber link.