Dreamer of NZ

Dearl all:
We know there is a status word in PLC, and content of status word is such as BR, OS, OV..., how can I read it via any function or other way?
But when I monitor program with STL, I can see this status word in the right window.

STEP7 online manual

L STW (instruction L with the address STW) loads ACCU 1 with the contents of the status word. The instruction is executed without regard to, and without affecting, the status bits.

NoteFor the S7-300 series CPUs, the statement L STW does not load the FC, STA, and OR bits of the status word. Only bits 1, 4, 5, 6, 7, and 8 are loaded into the corresponding bit positions of the low word of accumulator 1.