Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 242)

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Appendix B

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B-111

Returns

Status Symbolic Name Meaning



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Description

Use the MSG_WRITE_W_HANDLER function to initiate the processing

of unsolicited message-write instructions from the PLC-5 programmable

controller. This function puts an entry in the Message Control Table

(MCT) for the requested message number (0-31). When the PLC-5

programmable controller executes that message number, data from the

PLC-5 programmable controller is transferred to the specified user buffer.

This function is synchronous. When this function is initiated, the

application program stops until the function completes or fails. For the

asynchronous version of this command, see MSG_WRITE_HANDLER.

C Example

short variable [4] /* buffer to receive write 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 written by PLC-5 */

int iostat; /* iostatus return value */

int rtn_val; /* function return value */

rtn_val = MSG_WRITE_W_HANDLER (&variable, sizeof (variable), msgnum, items,

timeout, cc_type, PLC_type, &iostat);

1 2 ... 237 238 239 240 241 242 243 244 245 246 247 ... 311 312

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 242