The Omron NJ101-9020 is a Sysmac NJ1-series CPU unit, DIN-rail mounted, with 1 ms minimum cycle time and 3 MB of program memory. It carries integrated EtherCAT and EtherNet/IP ports, an SD-card flash memory slot, and a programming connection over USB or Ethernet. Programming is Ladder, Structured Text, or Function Block; motion control runs over EtherCAT, with 0/0/0 axes on this CPU variant.
Cross-shop: NJ101-9020 vs NJ301-1200
The closest functional sibling in the Sysmac NJ line is the NJ301-1200, which is the next step up the same family.
Sourcing posture
Mounting is DIN rail, so the unit drops into the standard Sysmac NJ cabinet footprint without a subpanel cutout; size the cabinet for the expansion headroom of up to 40 units per CPU if the cell is distributed. Both EtherCAT and EtherNet/IP are on-board, which removes a separate coupler from the bill and leaves the fieldbus slice to one CPU module plus its slices. Programming port is USB or Ethernet, so the commissioning laptop connects without a dedicated serial cable — keep a known-good USB cable in the panel spares kit because that path is what carries the first download.