Eaton easySafety, Руководство пользователя

Страница: 123 / 695

Circuit diagram elements
119
02/16 MN05013001Z EN
Number formats
The easySafety device processes calculations with a signed
31-bit value.
The value range is:
–2147483648 to +2147483647
With a 31-bit value, the 32nd value is the sign bit.
Bit 32 = status 0 -> positive number.
Example:
00000000000000000000010000010010
bin
=
412
hex
= 1042
dec
Bit 32 = status 1 -> negative number.
Example:
11111111111111111101110010101110
bin
=
FFFFDCAE
hex
= –2147474606
dec
h
The values of the data types marker byte (MB) and marker
word (MB) are processed as unsigned. This must be
remembered particularly if you wish to transfer the output
of a standard function block which can take on negative
values to the input of a standard function block and wish
to buffer the value in the marker range.
If a used variable can take on negative values and you
wish to store this in the marker range, you must assign a
marker double word for it.