The Allen-Bradley 1797-ACNR15 is a FLEX Ex ControlNet communication adapter from Rockwell Automation, specifically engineered for use in hazardous area environments. As part of the FLEX Ex product family, this intrinsically safe (I.S.) module provides connectivity between ControlNet networks and up to eight (8) FLEX Ex I/O modules. It features two (2) redundant ControlNet coaxial media ports, ensuring high network availability and fault tolerance. The 1797-ACNR15 is certified for Ex ib IIB/IIC T4, AEx ib IIC T4, and Class I, Division 1, Groups A–G, T4 hazardous area classifications. Designed for intrinsically safe communication and distributed I/O architecture, this adapter enables reliable ControlNet networking in process automation systems operating within explosive or hazardous environments.