Allen-Bradley 1747-AIC SLC 500 DH-485 Link Coupler

Allen-Bradley 1747-AIC is an isolated DH-485 Link Coupler for SLC 500 controllers that sits between the processor and a DH-485 network, providing electrical isolation to protect the SLC-500 from network transients while enabling DH-485 communication with other devices on the network. It bridges SLC 500 family devices to a DH-485 network and is powered from a 24 V DC supply to power the coupler and any connected peripherals, ensuring operation without a separate local power source. The interface presents a 6-position removable terminal block for the DH-485 cable along with an RJ-45 connector for DH-485 network wiring, reflecting its role as a compact field device in DH-485 setups. Catalog documentation confirms the 1747-AIC as the isolated link coupler used to connect SLC 500 devices to DH-485 networks, and Rockwell/Allen-Bradley notices indicate the model was discontinued effective January 31, 2017. In legacy installations, the 1747-AIC is commonly used to support DH-485 token-passing networks and to connect DH-485 peripherals—such as PICs, HHTs, or DTAM modules—via compatible cables and adapters, enabling programming, data exchange, and monitoring across the network.