In the early 1980s, ABB chose a floppy disk format that ended up not being the standard (IBM) a few years later (think VHS vs Beta). ABB stuck with this format until the S4 came out in late 1993.
Try contacting the great folks at GRP and see if they still have the S2 floppy to CF or USB. See attached.
I still have some new 5.25" floppies and cleaning disk I'm waiting to donate to a museum. I used to convert the upside-down full height 5.25" to half height and later on, the 5.25" to 3.5". The easy to configure Teac FD235HF series disk drives worked out well back then for both S2 & S3 replacement, Adept MC and Kawasaki AD too.