Then use software (if it's available) or a handheld programmer or the PLC's own faceplate to scroll through the ladder and document it all. I suspect that the easiest (and quite possible only) way of translating it would be to get hold of the PLC that uses that waveform as a backup medium, and restore it to the PLC. Unfortunately, the PLC's mind was blown even more, so by 11pm that night, it was in a skip and we had an S7-300 in it's place "Aha, the communications cable!".Įven with my exposure to some fairly old and obsolete equipment to date, that still blew my apprentice mind. He rummaged around some more and pulled out a 3.5mm jack cable. The deck had little white paint marks on the volume controls, indicating exactly where to set the volume to perform the backup and restore functions. He rummaged around some more and pulled out an old cassette deck. He rummaged around in the cupboard and pulled out a cassette. My supervisor came into the office and told me that an old GE Fanuc PLC had lost it's memory. When I was an apprentice, I saw something like this.
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