Siemens SIMATIC S7-1200 Reference Manual page 22

Basic instructions
Read/write access
Recommendation: Symbolic programming.
✔ ✔
Read data in little endian format
✔ ✔
Write data in little endian format
✔ ✔
Read data in big endian format
✔ ✔
Write data in big endian format
Read memory address
✔ ✔
Read memory bit
✔ ✔
Write memory address
✔ ✔
Write memory bit
✔ ✔
Write memory area
✔ ✔
Legacy
Recommendation: Symbolic programming
✔ ✔ ✔ Move block
✔ ✔ ✔ Move block not interruptible
✔ ✔ ✔ Fill block
A5E33284667-AF
Extended instructions
Description
Technology
STL
LAD/FBD
(not S7-1200)
BLKMOV
UBLKMOV
FILL
Communication
SCL
READ_LITTLE
WRITE_LITTLE
READ_BIG
WRITE_BIG
PEEK
PEEK_BOOL
POKE
POKE_BOOL
POKE_BLK
Page 21