Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 236)

API Library of Routines
Appendix B
MSG_WRITE_HANDLER
B-105
Handles a PLC-5 programmable-controller message-write instruction.
C Syntax
#include <copro.h>
unsigned MSG_WRITE_HANDLER (variable,buff_size,msg_num,
items,timeout,CC_type,plc_type,
iostat)
short *variable;
unsigned buf_size;
unsigned msg_num;
unsigned items;
unsigned timeout;
unsigned cc_type;
unsigned plc_type;
int *iostat;
Parameters
variable
Address of a buffer that stores the write data.
buff_size
Size of the write buffer in bytes.
msg_num
Number of the PLC-5 programmable-controller message (0-31).
items
Number of data items to be written by the PLC-5 programmable
controller. The number and size of the items cannot be greater than
234 bytes—e.g., maximum of 58 floating-point values of 4 bytes each
are
<
234 bytes.
timeout
Timeout value in seconds. When using a value of CC_FOREVER
(defined in COPRO.H), this function keeps the write handler posted
until a message has been received.
MSG_WRITE_HANDLER