Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual do Utilizador descarregar pdf (Página 229)

Detailed Flowcharts

Appendix D

D19

Figure D.22

Message Queue

FIRST

LAST

NEXT

MESSAGE

SIZE

STATUS

Network

Data

Block

NEXT

MESSAGE

SIZE

STATUS

Network

Data

Block

0

MESSAGE

SIZE

STATUS

Network

Data

Block

ROOT

MESSAGE

CONTROL BLOCKS

MESSAGES

The Address of a

Queue is the

Address of its Root.

NOTE: Messages are added to the

end of the queue and removed

from

the head.

10092–I

Figure D.23

UNLINK

Subroutine

RETURN

An Implementation

Input:

UNLINK

Address of Queue

Output:

Message Control Block

Dependent Routine

that Removes a

Message from a Queue

•

•

10093–I

1 2 ... 224 225 226 227 228 229 230 231 232 233 234 ... 238 239

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