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Automatic control function programming manual ladder language

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3.1 Principle of Exchanges<br />

Variables<br />

Exchanges between the automatic <strong>control</strong> <strong>function</strong> and the NC <strong>function</strong> are via a memory space accessible to both<br />

<strong>function</strong>s called the exchange area.<br />

Exchanges with the discrete input/output cards are processed directly by the automatic <strong>control</strong> <strong>function</strong>.<br />

REMARK The terms inputs and outputs are defined with respect to the automatic <strong>control</strong><br />

<strong>function</strong>.<br />

An input is a variable read by the automatic <strong>control</strong> <strong>function</strong>.<br />

An output is a variable written by the automatic <strong>control</strong> <strong>function</strong>.<br />

NC <strong>function</strong><br />

- CNC software<br />

- Part<br />

programme<br />

- etc . . . .<br />

AUTOMATIC CONTROL FUNCTION INPUTS<br />

Write %R<br />

Read %W<br />

EXCHANGE AREA<br />

Read %R<br />

Write %W<br />

AUTOMATIC CONTROL FUNCTION OUTPUTS<br />

Figure 3.1 - Principle of exchanges<br />

<strong>Automatic</strong> <strong>control</strong><br />

<strong>function</strong><br />

- Monitor<br />

- User<br />

programme<br />

Read %Irc<br />

Write %Qrc<br />

- <strong>Automatic</strong><br />

<strong>control</strong>s<br />

- Machine panel<br />

en-938846/6 3 - 5<br />

3

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