CAN-8123, CAN-8223, and CAN-8423 are CANopen remote I/O units specially designed for the slave devices of CANopen protocol with 1/2/4 expanding I/O slots. The new revisions of these products are not only supported more I/O modules but also provided hot-swap function for the high profile I/O modules. Furthermore, the new revised products with all terminals at front-panel are convenient for users to wire and reduce the product volume efficiently. Whatever the CANopen applications are, all of these products are offered to the customers the CANopen Remote I/O solutions.