Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador descarregar pdf (Página 223)

'!- -2+%+0/'*$.

Appendix B



B-92

Returns

Status Symbolic Name Meaning



 ,$- /'+* .0""$..%0(

  $.. &$ *0)!$- '*1 ('#

   '. *+/ "+**$"/$# +- +%%('*$

  *1 ('# /')$+0/ 1 (0$

  *1 ('# "+,-+"$..+- # / /2,$

  *1 ('# 4 # / /2,$

  $.. &$ (-$ #2 ,$*#'*&

  $.. &$ !+-/$#

  *1 ('# .'3$ %+- +,$- /'+*

  '3$ +% !0%%$- /++ .) ((

Description

Use the MSG_READ_HANDLER function to initiate the processing of

unsolicited message read 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 asynchronous. When this function is initiated, control is

returned to the application. Use MSG_WAIT to monitor/complete the I/O

operation. For the synchronous version of this command, see

MSG_READ_W_HANDLER.

C Example

See MSG_WAIT on page B-102 for a complete example of asynchronous

message processing.

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual do Utilizador Página 223