Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 199)

ASCII Module
PLC-2 Family Processors
Appendix A
AĆ31
Figure A.11
Example Block Transfer Operation
EN
BTR
BLOCK XFER READ
RACK
GROUP
MODULE
012
7
1=HIGH
FD110:0000
DN
64
FB200:0012
ER DATA
LENGTH
CNTL
CNTL
CNTL
CNTL
12
15
13
Data File
(Up to 64 words)
FD110
FB200
0
63
12
21
Control File
(10 words)
ASCII
I/O Module
Block Transfer instruction goes true.
Appropriate status bits are set/reset, and the control file tells the
I/O scanner module the address of the data file.
Data from the block transfer I/O module is transferred to the block transfer
data file in the processor data table.
Upon completion of the block transfer, the appropriate status bits are set/
reset.
NOTE: The direction of data flow is reversed for a write block transfer
operation.
Rack 12,
Module Group 7,
Upper Slot
Word File
You must create the data file
large enough to handle the block
length that you entered in the block
transfer instruction.
This file is created automatically
when you
enter the block transfer instruction
into your program.
Data
Flow
4 2
3
1
1
2
3
4