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Файл:PLC / FreePLCEbook-4.pdf
plc network - 28.22
28.5DESIGN CASES
28.5.1Devicenet
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 using Devicenet.
RS-232
"pickup" = pickup part
Robot
PLC
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feed part |
part waiting |
box full |
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Parts |
Parts Pickup |
Box and |
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Feeder |
Fixture |
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Weigh Scale |
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Figure 28.16 Box Loading System
Solution: The following ladder logic will implement part of the control system for the system in Figure 28.16.