bit shift left SFTL

[yeap6211]

May I know where to keep more infor about this mitsubishi FX1N SFTL instruction as i want to use this SFTL in my PLC program.
The mitsubishi manual not detail enough.Thank you

 

[Goody]

--|X0|---[STLP X1 M1 K10 K1]

When X0 becomes true check the state of X1 and move that state to M1 in a stack of 10 bits(K10). Do this for 1 scan (P)
On the next operation of X0 shift left all the bits from M1 to M10 1 step (K1) and insert the state of X1 into M1