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Automating Manufacturing Systems - Process Control and ...

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plc serial - 27.14<br />

on many new instruments.<br />

27.4 DESIGN CASES<br />

27.4.1 PLC Interface To a Robot<br />

Problem: A robot will be loading parts into a box until the box reaches a prescribed<br />

weight. A PLC will feed parts into a pickup fixture when it is empty. The PLC will tell the<br />

robot when to pick up a part <strong>and</strong> load it into the box by passing it an ASCII string,<br />

"pickup".<br />

PLC<br />

RS-232<br />

"pickup" = pickup part<br />

Robot<br />

feed part part waiting box full<br />

Parts<br />

Feeder<br />

Parts Pickup<br />

Fixture<br />

Box <strong>and</strong><br />

Weigh Scale<br />

Figure 27.12<br />

Box Loading System<br />

Solution: The following ladder logic will implement part of the control system for<br />

the system in Figure 27.12.

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