Rockwell-automation GMLC Reference Manual Manual de usuario Pagina 778

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Publication GMLC-5.2 - November 1999
Using Block Transfers 741
For example, the integer data file shown below (in hexadecimal format)
gets the Maximum Negative Travel value (data parameter 12) for axis 1
from the motion controller when specified in a BTW as shown in Getting
Data from the Motion Controller in this chapter. Word 0 specifies that this
block transfer is getting (7Dxx) data parameters for axis 1 (xx11). Word 1
specifies the first item as data parameter 12 (12 decimal = 000C hex).
Word 2 specifies 32-bit floating-point format (30xx) and that one item is
to be sent (xx01). Word 3 is the end-of-block delimiter (000D).
Data Table Report PLC-5/30
Address 0 1 2 3 4 5 6 7 8 9
N14:0 7D11 000C 3001 000D 0000 0000 0000 0000 0000 0000
N14:10 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N14:20 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N14:30 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N14:40 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N14:50 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N14:60 0000 0000 0000 0000
The returned value is stored in data file N7 as two 16-bit integers
representing the floating-point value. For example, a Maximum Negative
Travel value of –511.4872 is returned as C3FF in word 0 (the most
significant word) and BE5D in word 1 (the least significant word) as
shown below.
Data Table Report PLC-5/30
Address 0 1 2 3 4 5 6 7 8 9
N7:0 C3FF BE5D 000D 0000 0000 0000 0000 0000 0000 0000
N7:10 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N7:20 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N7:30 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N7:40 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N7:50 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
N7:60 0000 0000 0000 0000
See Getting Data from the Motion Controller in this chapter for more
information on the format returned values file.
If words 0 and 1 of the integer data file N7 are copied to word 0 of
floating bit file F16 in the PLC using a File Copy instruction (as shown in
32-bit Floating-Point Format in this chapter) the original floating-point
value is restored.
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