
13–17PLC Addressing
Publication
17706.5.16 - October 1996
PLC5 Floating Point
PLC-5 type reads and type writes use the IEEE floating point.
(This is the default for PLC-5 processors.) This means data is
returned:
• low word then high word
• low byte then high byte
Example:
PLC5
type read
2.0 =
FF
FF FF
BF
1000.00 = 00 00 7A 44
low high
low
high
low word
high word
exponent
MSB mantissa
middle MSB mantissa
LSB mantissa
Example:
PLC5
word range read
1000.00 =
7A
44 00
00
2.0 =
FF
BF FF
FF
3.0 =
40
C0 00
00
low high
low
high
low word
high word
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