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Automatic control function programming manual ladder language

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15.1.2 DNC1000 Exchange Mechanism<br />

Exchanges by Protocol<br />

15.1.2.1 Request Processing Procedure<br />

The automatic <strong>control</strong> <strong>function</strong> (requester) sends a (Read/Write) request to the server. This request, placed in a buffer,<br />

is queued. It is then processed by the server which sends an answer code and possibly data to the requester. The<br />

answer and data are recovered by the user programme.<br />

USER<br />

PROGRAMME<br />

(UNITE requester)<br />

TRANSMISSION<br />

MONITOR<br />

ANSWER<br />

ACQUISITION<br />

RECEPTION ANSWER<br />

QUEUE OF<br />

REQUESTS<br />

REQUEST<br />

Figure 15.2 - Request processing principle<br />

CNC<br />

FUNCTION<br />

(UNITE servers)<br />

REQUEST<br />

PROCESSING<br />

en-938846/4 15 - 5<br />

15

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