The Allen-Bradley 1747-PSD is a program storage device designed for use with the SLC 500 series, providing flexible and secure program management for industrial automation systems. It features a four-position selector switch that allows users to choose between Program Transfer, Memory Module, Clear Memory, and Secondary Industrial Programming Station modes. A pushbutton executes the selected function, enabling precise control of program storage operations. The 1747-PSD includes a battery compartment that holds two AAA 1.5V batteries (not included), ensuring Class I, Division 2, Groups A, B, C, and D certification when used with batteries. Red and green LED indicators provide clear operational status, and the module accepts 7–30 VDC user-supplied power from a Class 2 power supply, offering reliable and versatile operation for SLC 500 controllers.