Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 167)

API Library of Routines
Appendix B
CC_PLC_SYNC
B-36
Synchronize with PLC-5 program scan. This function can be used with a
direct-connect mode control coprocessor only.
C Syntax
#include <copro.h>
unsigned CC_PLC_SYNC ( )
Parameters
None.
Returns
Status Symbolic Name Meaning
0 CC_SUCCESS Operation successful
157 CC_E_NOTCONNECT PLC isnot connected or offline
Description
Use the CC_PLC_SYNC function to synchronize to the PLC-5
programmable-controller ladder scan. This routine will put the calling task
to sleep until the PLC-5 programmable controller signals the start of a new
ladder scan. Due to the multitasking of OS-9, it should be noted that this
function is most effective when only one task is synchronized to the PLC-5
programmable-controller scan and that task is a higher priority than the
other tasks.
C Example
unsigned status;
.
.
.
status = CC_PLC_SYNC();
.
.
.
CC_PLC_SYNC