FnIO S-Series is the Network IO of the slice type for FieldBus system, like DeviceNet, PROFIBUS, PROFINET, CAN open, CC-Link, and etc, which applied FES design technique. FnIO S-Series was designed for the user’s convenience amd RTB (Removable Terminal Block) applied the small size for easy wiring and easy fixing. FnIO S-Series has the header type module which can 16 points as well, so that user can use many points and easy wiring.