The cards on PLC can't be replaced by ordinary cards, just like MMC cards on PLC, which are exactly the same as those on ordinary cameras. Replacement is ok, but PLC will never read it. Ordinary cards are commercial cards, and the cards on PLC are industrial cards, which also contain the patents and interests of manufacturers and will not be allowed to be replaced so easily. Especially the MMC card of Siemens, don't read it directly in the computer, it will lose the program.
As for the problem of replacing CF card with U disk, it goes without saying.