Sankar

is it possible to convert a REALinto DWORD?

Structure of real numbers
A number of the real data type is 32 bits long in STEP 7. The individual bits have the following meanings (bit counting from right to left):

• Bit 0..22: mantissa of the real number (in the binary system).
• Bit 23..30: exponent of the real number (e = exponent -127).
• Bit 31: sign of the real number (0 -> positive, 1 -> negative)

You can calculate the real number using the following formula:
Sign * Mantissa * 2 ^{(Exponent -127)}

Fig. 01 below shows the graphical representation of the structure of real numbers with 32 bits as used in STEP 7.

More information on the structure of the REAL data type is available in the S7 Online Help under "Format of the REAL data type (floating-point numbers)".

Keywords:
Float, ==R, Floating-point number

CPU can interpret 32- bit memory area as a real number or a double word(digital number with structure explained above). this depends on the codes used to handle the variable.