Rockwell Automation Allen-Bradley ControlLogix 1756-MVI Programming Reference Manual page 45

MVIbp_GetProcessorStatus
Example:
MVIHANDLE handle;
WORDstatus;
MVIbp_GetProcessorStatus(handle, &status);
if (status & MVI_PROCESSOR_STATUS_RUN)
// Processor is in Run Mode
else
// Processor is not in Run Mode or there is no connection
MVI Backplane API
Publication 1756-RM004B-EN-P - October 2000
3-23