Statement List (STL) - DCE FEL ČVUT v Praze

3.5 ITD Integer (16 Bit) to Double Integer (32-Bit)
Format
Description
Status word
Example
ITD
Conversion Instructions
ITD (conversion of a 16-bit integer number to a 32-bit integer number) interprets the
contents of ACCU 1-L as a 16-bit integer and converts it to a 32-bit double integer.
The result is stored in accumulator 1. Accumulator 2 remains unchanged.
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - - - - -
STL Explanation
L MW12 //Load the integer number into ACCU 1.
ITD //Convert from integer (16-bit) to double integer (32-bit); store result in
ACCU 1.
T MD20 //Transfer result (double integer) to MD20.
Example: MW12 = "-10" (Integer, 16-bit)
Contents ACCU1-H ACCU1-L
Bit 31 . . . . . . . . . . 16 15 . . . . . . . . . . 0
before execution of ITD XXXX XXX XXX XXX 1111 1111 1111 0110
X X X
after execution of ITD 1111 1111 1111 1111 1111 1111 1111 0110
(X = 0 or 1, bits are not used for conversion)
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 3-5