Allen-Bradley 1720-L740 Printed Circuit Board

The Allen-Bradley 1720-L740 Printed Circuit Board is a legacy replacement PCB from Rockwell Automation, identified by the part number 1720-L740. It is used to service older Allen-Bradley control systems that rely on this specific board in their chassis.

Intended as a field-replaceable component, the 1720-L740 restores electronic pathways within compatible modules, supporting the host controller’s signaling and interconnect interfaces. The exact role of the board depends on the module family and firmware version originally paired with it.

Application contexts typically include legacy PLC installations where downtime recovery depends on a direct PCB replacement rather than a full module refresh. Because replacement accuracy hinges on matching the host equipment, verify fit against your device documentation and Rockwell Automation’s compatibility resources.

Distributors such as Zoro, IMS Supply, and York Controls list the part as 1720-L740. Availability and exact fit should be confirmed against your equipment’s documentation to ensure the replacement aligns with the original hardware configuration.