Statement List (STL) - DCE FEL ČVUT v Praze

Conversion Instructions
3.7 DTR Double Integer (32-Bit) to Floating-Point (32-Bit
IEEE-FP)
Format
Description
Status word
Example
DTR
DTR (conversion of a 32-bit integer number to a 32-bit IEEE floating point number)
interprets the content of ACCU 1 as a 32-bit double integer and converts it to a 32-bit
IEEE floating point number. If necessary, the instruction rounds the result. (A 32-bit
integer has a higher accuracy than a 32-bit floating point number). The result is
stored in accumulator 1.
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - - - - -
STL Explanation
L MD10 //Load the 32-bit integer into ACCU 1.
DTR //Convert from double integer to floating point (32-bit IEEE FP); store result
in ACCU 1.
T MD20 //Transfer result (BCD number) to MD20.
DTR
MD10
MD20
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 1 0 0
Integer (32 bit) to IEEE floating-point (32 Bit)
"+500" Integer
31 30... 22...
...0
0 1 0 0 0 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
8-bit exponent
1 bit
Sign of the mantissa
23-bit mantissa
"+500" IEEE-FP
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 3-7