Allen-Bradley 1747-L542 NSNBC01 Programmable Logic Controller

The Allen-Bradley 1747-L542 NSNBC01 is a SLC 500 Series CPU (5/04) designed for compact, legacy Rockwell automation applications. It provides an RS-232 port for programming and diagnostics and a DH+ (Data Highway Plus) communications port to connect with other SLC 500 or PLC-5 devices, enabling straightforward integration into existing control networks. The processor includes 32 KB of memory for program and data storage, placing it in the L542 family of 1747 CPUs, and it supports the 1747 I/O ecosystem used in SLC 500 racks. A conformal-coated variant, 1747-L542-CC, is available for environments with higher humidity or contamination. Typical applications include discrete control on small- to mid-sized manufacturing lines, packaging operations, and material-handling tasks where a compact, compatible Rockwell PLC is appropriate for retrofits or upgrades that rely on DH+ networking and RS-232 programming interfaces.