mirror_untrue
The two commands
L RS 33 and L RS 34
Mean that you are loading a word (33 and 34) from the system data range into ACCUM 1
TIR 2 means that you are transfering the contents of ACCUM 2 indirectly into a memory word addresed in ACCUM 1
LIR 0 means that you are loading the contents of a memory word, addressed by ACCUM 1 into ACCUM 1,
In the two above (TIR and LIR) 0 = ACCUM1 and 2 = ACCUM2 for both commands.
As for their Step 7 equivalents, that would depend on the context in what they were originally used and where the data is now stored in the S7 PLC, a L and T command would probably suffice, with a pointer to the correct memory area in the S7.
That's about all the help I can give, without seeing the program.
If I remember rightly, are the system data ranges addressed as S, or as I would call them S flags. I am not sure on that, perhaps someone would like to put me right on that.
Paul