1. The power to the M172 should be turned off (no connections to the USB mini port for programming).
2. Insert the USB stick and then apply power.
3. At boot-up the M172 will detect the USB memory stick and will copy the project from the USB device into the PLC.
4. When the copy process is finished only the Green LED on the M172 will be lit.
5. Remove USB memory stick and then power cycle the M172 PLC.
6. The new program will begin operating.

Modicon M172 Logic Controller Hardware Guide

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