Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 232)

13–17 PLC Addressing
Publication 1770Ć6.5.16 - October 1996
PLCĆ5 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: PLCĆ5 type read
2.0 = FF FF FF BF
1000.00 = 00 00 7A 44
low high low high
low word high word
exponent
MSB Ć mantissa
middle MSB Ć mantissa
LSB Ć mantissa
Example: PLCĆ5 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