Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 219)

API Library of Routines
Appendix B
MSG_CLR_MASK
B-88
Clears the bit associated with the specified message number.
C Syntax
#include
unsigned MSG_CLR_MASK (mask,msg_num)
unsigned *mask;
unsigned msg_num;
Parameters
mask
Address of the read or write mask used with the MSG_WAIT function.
This function will reset the bit corresponding to the message number.
msg_num
Number of the PLC-5 programmable controller message (0-31).
Returns
Status Symbolic Name Meaning
0 CC_SUCCESS Operation successful
133 CC_E_BAD_MSGID Message number invalid
Description
Use the MSG_CLR_MASK function to clear bits in the message
read/write masks.
C Example
See MSG_WAIT on page B-102 for a complete example of asynchronous
message processing.
MSG_CLR_MASK