Rockwell DeviceNet Communication Module

The Allen‑Bradley 1769‑SDN is a Compact I/O DeviceNet Scanner Module designed for the CompactLogix and MicroLogix 1500 controller platforms. It acts as a scanner on the DeviceNet network, collecting I/O data from up to 63 slave devices via strobe, poll, change‑of‑state, or cyclic messages, and makes that data available to the controller for application logic

The Allen‑Bradley 1756‑DNB is a DeviceNet Bridge/Scanner Module for the ControlLogix® platform that interfaces between DeviceNet devices and the ControlLogix controller. It acts as a scanner on the DeviceNet network, collecting I/O data from up to 64 slave devices and mapping it into the controller's tag database.