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All people today have seen a PC and will most properly have their own.
This was not true back in the 1980ies

My very first PC-XT
(The Taiwan Bamboo model)

Year: 1984

Price then: 10.000 kr ($1300)

CPU: 8088
Math-Coprocessor: 8087

RAM: 640kB (more then enough)

No harddisk (would have cost more then the PC alone)

2 x 5 1/4" floppy disc drives

CGA graphics adapter 480x640 pixels with 256 colors

RS232 COM + Printer-Port



 Modern PLC's do have many similarities with PC's