Simatic S5 Memory Mapping
A-3
S5 UniLink Adapter Installation and Operation
A.2 Floating-Point Conversion
The TI500/TI505 floating-point representation is different from the S5
representation; therefore, the S5 PIM will have to perform a conversion.
The sign bit of the TI500/TI505 floating-point is the same as the sign bit of
the S5 mantissa. You can determine how the exponent and mantissa values
are derived from the equations below.
NOTE: The IEEE floating-point supported by the TI500/TI505 PLCs is only
a subset of the IEEE standard. Please refer to a Series 505 PLC
specification for this information.
313029282726252423222120191817161514131211109876543210
Sign Exponent Mantissa
TI500/TI505 value = () 2
(E–127)
(1.M)
I003650
Figure A-1 TI500/TI505 IEEE Floating-Point Value
313029282726252423222120191817161514131211109876543210
Exponent Mantissa
S5 value = () (M) 2
(+/–)
(E)
Mantissa
Sign
Exponent
Sign
I003651
Figure A-2 S5 Floating-Point Value
Description
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