The Allen-Bradley 1769-L19ER-BB1B is a CompactLogix 5370 Programmable Automation Controller (PAC) designed for high-performance control and communication. This 1769-L19ER-BB1B controller features dual Ethernet interfaces that function as a built-in Ethernet switch, supporting linear and redundant Ethernet/IP topologies. It provides 1 MB of user memory and includes a 1784-SD1 memory card. The controller also features one (1) USB communication port and supports up to thirty-two (32) controller tasks with one hundred (100) programs per task. In addition, the Allen-Bradley 1769-L19ER-BB1B includes sixteen (16) 24V DC discrete inputs and sixteen (16) 24V DC discrete outputs, with support for up to six (6) 1734 POINT I/O expansion modules for flexible system configuration.