Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario descargar pdf (Pagina 70)

Chapter 5

-$'("& )' )%*

5-10

For example, a PLC-5 programmable controller initiates an unsolicited

READ MSG instruction to the control coprocessor. The READ MSG

instruction transfers one word of data. The order of events is:

! '&+)'$ '()'**') ()' )%

)*('&* ."+! 

 ')



+!&

!

 ')

 +)" )*

  "& +! ()' )% *

'& +! '& .') +!+ .* *&+

Note: !  ,&+"'& .)"+* + )'% +!

'&+)'$ '()'**') +' +! 0 ()' )%%$ '&+)'$$)

Check Status of Asynchronous MSG Functions (MSG_WAIT)

When your application program uses asynchronous MSG read/write

functions, you must include at least one MSG_WAIT in your program.

MSG_WAIT checks for the completion of any combination of pending

read/write message number and updates the message number in a read

and write mask.

Mask Functions

Use the MSG_ZERO_MASK function to zero all the bits in a mask from

previous operations when you use a MSG_WAIT function in your

program. All the mask functions are used with the MSG_WAIT function.

Table 5.H

Mask Functions for Unsolicited, Asynchronous Read and Write Functions

Function What It Does



$)* +! "+* "& +! %**  ).)"+ %*#* **'"+ ."+!  *("" %**  &,%)

 +* +! "+* "& +! %**  ).)"+ %*#* **'"+ ."+!  *("" %**  &,%)

 *+* +! "+* "& +! %**  ).)"+ %*#* **'"+ ."+!  *("" %**  &,%)

 * +' /)' $$ +! "+* "&  *("" %**  &,%)

Clear Pending Messages

See page 5-13 for information on using the CC_MKILL utility to clear

pending messages from the message handler.

TAG functions provide a means for the user to specify access to control-

coprocessor memory. Use TAG functions to access memory for:

external intelligent devices—i.e., ControlView connected to a serial port

multiple processes interacting on OS-9

You can configure the size of the TAG table using the CC_CFG utility.

The default size allows the creation of 1024 TAGs.

How to Use TAG Functions

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 311 312

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Manual de usuario Pagina 70

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