User Manual

easy800 operation
99
08/04 AWB2528-1423GB
Marker double words always contain all data formats. When
several write accesses to MD, MW, MB or M (within an MD)
are made, it is the last write operation that is retained.
Number formats
easy makes computations with a signed 31 bit value.
The value range is:
–2147483648 to [phone]
The 32nd bit is the sign bit with a 31 bit value.
Bit 32 = state “0” means a positive number.
Example:
00000000000000000000010000010010
bin
=
412
hex
=1042
dec
Bit 32 = state 1 means a negative number.
Example:
11111111111111111101110010101110
bin
= FFFFDCAE
hex
= –9042
dec
32 bit MD49
32 bit MD50
…
32 bit MD95
32 bit MD96
h
You should only write the markers once.
Applies
to MD,
MW, MB,
M
Left = most
significant bit,
byte, word
Right = least
significant bit,
byte, word
h
The marker byte (MB) and marker word (MW) number
formats are unsigned.