The Allen-Bradley 1756-DHRIO is a communication module from the ControlLogix series that supports both Remote I/O (RIO) and Data Highway Plus (DH+) network protocols. It features two embedded communication channels, labeled Channel A and Channel B, each equipped with a 3-pin terminal for wiring DH+ or RIO networks. Additionally, the module includes a single 8-pin mini-DIN port wired in parallel with Channel A, providing flexible connection options for system integration. The 1756-DHRIO enables reliable data exchange between ControlLogix controllers and legacy Allen-Bradley networks, making it suitable for hybrid and migration automation environments.