The Allen-Bradley 1747-L542 is an SLC 5/04 processor from the SLC 500 series, providing robust control with 4096 inputs/outputs and analog I/O support for 480 devices. It features a 32 KB battery-backed RAM, fast program scan time, and uses RSLogix500 software. Connectivity includes Data Highway Plus and RS-232, with reliable operation in 0-60°C environments. Manufacturer Industrial Automation Brand Allen-Bradley Part Number/Catalog No. 1747-L542 Series SLC 500 Inputs 4096 Module Type SLC 5/04 Processor Outputs 4096 Programming software RSLogix500 software Analog I/O 480 Memory Up to 32 KB, Battery Backed-RAM Program Scan Time 0.9 ms/K User Memory 32,000 Words I/O Chassis 3 Chassis Module Slots 30 I/O Scan Time 0.225 milliseconds Communication Data Highway Plus (DH+), RS-232 Ambient Temperature 0 to 60 degrees Celsius Backup Memory 1747-M13 Battery back-up memory Yes; 1747-BA UPC 10662468417454 UNSPSC 32151705