Allen-Bradley 1785-L40B PLC-5 DH Processor Module

The Allen-Bradley 1785-L40B PLC-5/40 Processor Module is a standard PLC-5/40 controller that combines a four-channel DH+ / Remote I/O interface with 48K words of SRAM, delivering ample memory for program and data in demanding automation tasks. It supports up to four independent DH+/Remote I/O networks, enabling flexible network topologies where each channel can connect different DH+ or Remote I/O devices without bottlenecks. This Series A–E family processor (1785-L40B) is designed as a PLC-5/40 controller, with a backplane current requirement of about 3.3 A at 5 V and memory architecture configured for robust, battery-backed operation in industrial environments.