Several Statements & Functions only apply to certain firmware revisions of the PLC's but the manual, generally, not specified which applies in each case.
e.g.:
SetSysem 5, x works on firmware r47 & above
SetSystem 6, x works on firmware r47 & above
...........
Please could in future developments, put this information in the manuals?
Meanwhile, you can make a publication that collect all this information?