What the Key Rating Means for the Buyer
The MR-J5-20B: The '20B' designation indicates the drive's rated output current for a 200 V class motor. On the bench, this translates to driving a medium-inertia servo motor in the 200 W to 400 W range, common for pick-and-place axes, indexing tables, or small rotary stages. The SSCNETIII/H fiber-optic ring delivers deterministic cycle times down to 0.22 ms, so the drive closes the position loop inside the motion controller — no analog feedback drift, no encoder cable noise.