User guide

13–17PLC Addressing
Publication 17706.5.16 - October 1996
PLC5 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: PLC5 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: PLC5 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