Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 228)

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Appendix B

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B-97

C Example

short variable [4] /* buffer to store read data */

unsigned timeout = 45; /* 45 second timeout */

unsigned msgnum = 10; /* plc message number 10 */

unsigned cc_type = 3; /* CC_WORD = 3; */

unsigned plc_type = 3; /* PLC_WORD = 3; */

unsigned items = 4; /* 4 words of data to be read */

int iostat; /* iostatus return value */

int rtn_val; /* function return value */

variable [0] = 1;

variable [1] = 9;

variable [2] = 9;

variable [3] = 2;

rtn_val = MSG_READ_W_HANDLER ( variable, sizeof (variable), msgnum, items,

timeout, cc_type, PLC_type, &iostat);

BASIC Example

The BASIC function code is 40.

DIM status : INTEGER

DIM iostat : INTEGER

DIM msgrbuf(5) : INTEGER

rem * MSG_READ_W_HANDLER - Set up handler to allow for a synchronous message

rem * read of msgrbuf. This function will wait for

rem * completion of the I/O before returning to the user.

rem * Size of buffer is 20 bytes, message number is 0,

rem * number of items to read is 5, the timeout value is

rem * 6 seconds, the coprocessor data type is integer,

rem * the plc data type is short and iostat gets the I/O

rem * completion code.

RUN AB_BAS (40,status,ADDR(msgrbuf(1)),20,0,5,6,5,3,ADDR(iostat))

References

MSG_WRITE_W_HANDLER();

Also see asynchronous functions

MSG_READ_HANDLER(); MSG_WRITE_HANDLER();

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 228