Statement List (STL) - DCE FEL ČVUT v Praze

Examples
Shift and Rotate Instructions
Contents ACCU1-H ACCU1-L
Bit 31 . . . . . . . . . . 16 15 . . . . . . . . . . 0
before execution of SSD 7 1000 1111 0110 0100 0101 1101 0011 1011
after execution of SSD 7 1111 1111 0001 1110 1100 1000 1011 1010
Example 1
STL Explanation
L MD4 //Load value into ACCU 1.
SSD 7 //Shift bits in ACCU 1 seven places to the right, according to the sign.
T MD8 //Transfer result to MD8.
Example 2
STL Explanation
L +3 //Load value +3 into ACCU 1.
L MD20 //Load contents of ACCU 1 into ACCU 2. Load value of MD20 into ACCU 1.
SSD //Shift number is value of ACCU 2- L- L => Shift bits with sign in ACCU 1 three
places to the right, fill free places with state of sign bit.
JP NEXT //Jump to NEXT jump label if the bit shifted out last ( CC 1) = 1.
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 11-5