Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 232)

API Library of Routines
Appendix B
MSG_TST_MASK
B-101
BASIC Example
The BASIC function code is 46.
DIM status : INTEGER
DIM msg_w_mask : INTEGER
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rem * MSG_TST_MASK - test bit in msg_w_mask for message 1
RUN AB_BAS (46,status,ADDR(msg_w_mask),1)
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References
MSG_READ_HANDLER(); MSG_WRITE_HANDLER();
MSG_WAIT(); MSG_SET_MASK(); MSG_CLR_MASK();
MSG_ZERO_MASK();