Title: +038=360.000-OU045T_03-PCD2.m4160 PLS SBC - Hardware Manual.pdf
If a flash card is plugged into the PCD and a backup is run, this module is automatically written to and the backup is also created on the onboard flash (provided sufficient memory space is available).3With a restore with a memory module plugged in, the content of the flash module is restored and then (where possible) copied to the onboard flash.Where multiple flash modules suitable for backing up the user program memory are installed on the PCD, the first from the left will be read/written to (sequence: M1, M2).In order to copy to the backup flash, the control must be in a STOP state. Where necessary, a reminder message will appear. The copying process may take up to 30 seconds. During the "Copy Program to Flash..." operation, the Run/Halt LED on the PCD flashes alternately red and green, and the Run and Halt LEDs also flash alternately.Program backup to backup flash