Allen-Bradley 1747-L040B SLC 500 Processor Module

Allen-Bradley 1747-L040B SLC 500 Processor Module is a fixed-hardware CPU for the SLC 500 family, combining a 1K-word memory CPU with an integrated power supply in a single module designed to fit in a 1747 chassis with accompanying I/O modules. The L040B variant provides 40 I/O points in a fixed package: 24 digital inputs (120 V AC) and 16 digital outputs (120–240 V AC triac outputs). It supports DH-485 serial communications, enabling networked control or PC connections for programming and monitoring. The processor runs a compact control program stored in its 1K words of user memory and interfaces with standard SLC 500 programming workflows (RSLogix 500). This module is intended for compact automation tasks such as small machines, conveyors, and packaging lines where a simple, standalone controller is suitable. When combined with compatible 1747 I/O modules and a power supply, the 1747-L040B forms a complete fixed-controller solution for single-chassis applications, offering straightforward setup and maintenance within legacy Allen-Bradley control systems.