Rockwell Automation GMLC Reference Manual - Manual (Page 772)

Publication GMLC-5.2 - November 1999
Using Block Transfers 735
If the PLC is getting data from the motion controller, no data values need
be specified in the BTW data file and thus the end-of-block delimiter is
word 3 (nn - 0). The data returned by the BTR is stored in the BCD (D)
file specified in the BTR. After completing the BTR, this file contains the
return values, as shown below.
3
4 First Data Item Value Least Significant Word
First Data Item Value Most Significant Word
5
6 Second Data Item Value Least Significant Word
Second Data Item Value Most Significant Word
2 nn+1
2 nn+2
Last Data Item Value Least Significant Word
Last Data Item Value Most Significant Word
2 nn+3 End-of-Block Delimiter (000D hex)
RIO Adapter Block Transfer Read
Word-Swapped 32-bit Signed BCD
Returned Values Data File Format
Word Description
0
1 First Data Item Value Least Significant Word
First Data Item Value Most Significant Word
2
3 Second Data Item Value Least Significant Word
Second Data Item Value Most Significant Word
2 nn-2
2 nn-1
Last Data Item Value Least Significant Word
Last Data Item Value Most Significant Word
2 nn End-of-Block Delimiter (000D Hex)
RIO Adapter Block Transfer Write
Word-Swapped 32-bit Signed BCD Data File Format
Word Description