Allen-Bradley 1785-L40B Overview The Allen-Bradley 1785-L40B is a PLC-5/40 processor module, part of the classic PLC-5 family used in a wide range of legacy industrial control systems. With 48K words of user memory, support for Remote I/O and Data Highway Plus (DH+), and a battery-backed RAM, this processor is well-suited for medium-to-large applications requiring robust logic control and network connectivity. It includes a mode keyswitch for secure operation. Key Features User Memory: 48K words Communication: Remote I/O Data Highway Plus (DH+) 57.6K baud default communication speed Processor Type: PLC-5/40 Backplane Compatibility: Standard PLC-5 chassis Memory Type: Battery-backed RAM Keys: RUN, PROG, REM selectable via onboard keyswitch Programming Software: RSLogix 5 Expansion: Supports I/O and communication expansion modules Technical Specifications Catalog Number: 1785-L40B Platform: PLC-5 Power Supply: 5V DC via backplane Memory Retention: Battery-backed (replaceable battery) Mounting: PLC-5 chassis Baud Rate: Configurable up to 57.6 kbps (DH+) Operating Temperature: 0°C to 60°C Certifications: UL, CSA, CE Status Indicators: LED diagnostics for power, communication, and fault Applications Legacy system automation and upgrades Water/wastewater treatment facilities Automotive and assembly lines Chemical and process control Infrastructure and facility automation Why Choose the 1785-L40B Reliable for existing PLC-5 system maintenance and expansion Dual communication options support complex topologies Strong memory capacity for sophisticated control logic Long-standing Allen-Bradley reputation for industrial reliability Order Now The Allen-Bradley 1785-L40B PLC-5/40 processor is available and ships worldwide.
