Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 230)

API Library of Routines
Appendix B
MSG_SET_MASK
B-99
BASIC Examples
The BASIC function code is 45.
DIM status : INTEGER
DIM msg_w_mask : INTEGER
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rem * MSG_SET_MASK - set bit in msg_w_mask for message 2
RUN AB_BAS (45,status,ADDR(msg_w_mask),2)
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References
MSG_READ_HANDLER(); MSG_WRITE_HANDLER();
MSG_WAIT(); MSG_CLR_MASK(); MSG_TST_MASK();
MSG_ZERO_MASK();