Allen-Bradley 1771-ACN15 ControlNet Remote IO Adapter

The Allen-Bradley 1771-ACN15 ControlNet Remote I/O Adapter is a single-port ControlNet interface that links a remote 1771 I/O rack to a ControlNet network from a PLC-5 or other ControlNet-enabled controller. It provides one ControlNet I/O port with a nominal data rate of 5 Mbit/s, and supports non-redundant media via a BNC connector alongside a shielded RJ-45 8‑pin interface for an alternative media path; the signaling path uses quad-shield RG-6 coaxial cable. The module is designed to supply the remote I/O backplane with up to 1 A at 5 V, enabling reliable power delivery to the connected I/O modules. Identified as REV P01, this adapter belongs to the 1771 ControlNet adapter family and serves as the bridge between Allen-Bradley remote I/O and the ControlNet network, facilitating communications for distributed I/O across remote locations. In typical installations, the 1771-ACN15 is installed in a remote I/O chassis and communicates with the ControlNet master to manage I/O data exchange, supporting the authorization and integration of 1771 remote I/O devices within a ControlNet topology. The 1771-ACN15/ACNR15 line is documented as enabling ControlNet communications for remote I/O on Allen-Bradley systems, including compatibility with PLC-5-era networks and related ControlNet configurations.