Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 220)

API Library of Routines
Appendix B
MSG_CLR_MASK
B-89
BASIC Example
The BASIC function code is 44.
DIM status : INTEGER
DIM msg_w_mask : INTEGER
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rem * MSG_CLR_MASK - clear bit in msg_w_mask for message 0
RUN AB_BAS (44,status,ADDR(msg_w_mask),0)
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References
MSG_READ_HANDLER(); MSG_WAIT();
MSG_WRITE_HANDLER();