Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 159)

API Library of Routines
Appendix B
CC_PLC_BTR
B-28
Requests the PLC-5 programmable controller to perform a block-transfer
read from an intelligent I/O module.
Important: You can use this function only if the coprocessor is connected
directly to the PLC-5 programmable controller.
C Syntax
# include
unsigned CC_PLC_BTR (r,g,m,size,retry,data_ptr,iostat)
unsigned char r;
unsigned char g;
unsigned char m;
unsigned char size;
unsigned char retry;
unsigned short *data_ptr;
unsigned *iostat;
Parameters
r
The assigned rack number in which the target I/O module resides.
g
The I/O group number that specifies the target I/O module.
m
The module slot number within the I/O group.
size
The number of words to be read from the I/O module.
retry
The retry value for doing the block transfer. If the value is, 0 the
processor will retry the transfer one time before returning. If the value
is 1, the processor will repeatedly attempt the transfer from an
unresponsive module for four seconds.
data_ptr
The address of a data buffer that will store the block transfer read data.
iostat
CC_PLC_BTR