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27.4 DESIGN CASES
27.4.1 PLC Interface To a Robot
Problem: A robot will be loading parts into a box until the box reaches a prescribed weight. A PLC will feed parts into a pickup fixture when it is empty. The PLC will tell the robot when to pick up a part and load it into the box by passing it an ASCII string, "pickup".
Solution: The following ladder logic will implement part of the control system for the system in Figure 418.
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