Rockwell Automation GMLC Reference Manual - Manual (Page 766)

Publication GMLC-5.2 - November 1999
Using Block Transfers 729
Be careful to choose the number of decimal digits such that the expected
maximum values of items in the motion controller can be represented
with the required precision in the PLC.
32-bit Floating Point Format
When the most significant digit of word 2 in the BTW data file is 3,
values are transferred as IEEE-format 32-bit floating point values. In the
PLC data file, each 32-bit floating point value is stored as two contiguous
16-bit integers. File Copy (COP) instructions must be used in the PLC to
transfer these two integers from a floating bit (F) file to the integer (N)
BTW data file for transfer to the motion controller.
RIO Adapter Block Transfer Read
32-bit Signed BCD Format Maximum Item Values
Number of
Decimal Digits
Maximum Item Value Dec. Hex.
0
1
2
3
4
5 0
1
2
3
4
5 ±79,999,999.0
±7,999,999.9
±799,999.99
±79,999.999
±7,999.999 9
±799.999 99
6
7
8
9
10 6
7
8
9
A ±79.999 999
±7.999 999 9
±0.799 999 99
±0.079 999 999
±0.007 999 999 9
11
12
13
14
15 B
C
D
E
F ±0.000 799 999 99
±0.000 079 999 999
±0.000 007 999 999 9
±0.000 000 799 999 99
±0.000 000 079 999 999