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<strong>S7</strong>-<strong>200</strong> CPU<br />

4.1 PLC<br />

PLC<br />

4–1<br />

Partition your process or machine.<br />

Create the functional specifications of the units.<br />

Design the hard-wired safety circuits.<br />

Specify the operator stations.<br />

Create the PLC configuration drawings.<br />

Create a list of symbolic signal-naming conventions (optional).<br />

4-1 PLC<br />

4-2

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