Allen-Bradley 1756-DHRI0 Communication Interface Module

The Allen-Bradley 1756-DHRI0 Communication Interface Module is a DH+/RIO bridge/scanner in the ControlLogix 1756 family, designed to link a DH+ Remote I/O network to the 1756 backplane. As a DH+/RIO interface, it handles Data Highway Plus communications for remote I/O devices and serves as the gateway for data exchange between the DH+ network and the ControlLogix controller. Typical applications include integrating legacy DH+ Remote I/O devices into modern ControlLogix systems, enabling remote I/O data transfer and network bridging within a single chassis. Verified physical and electrical characteristics include an open enclosure and a 1-slot width, with backplane current requirements of 5 V at 1.7 mA and 24 V at 850 mA, a maximum power dissipation of 4.5 W, operating temperature range of 0 to 60 °C (32 to 140 °F), and a unit weight of about 0.64 lb, with the module designed for installation in 1756 ControlLogix chassis.