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Automating Manufacturing Systems - Process Control and ...

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plc fb - 21.5<br />

21.5 PRACTICE PROBLEMS<br />

21.6 PRACTICE PROBLEM SOLUTIONS<br />

21.7 ASSIGNMENT PROBLEMS<br />

1. Develop a FBD for a system that will monitor a high temperature salt bath. The systems has<br />

start <strong>and</strong> stop buttons as normal. The temperature for the salt bath is available in temp.Ifthe<br />

bath is above 250 C then the heater should be turned off. If the temperature is below 220 C<br />

then the heater should be turned on. Once the system has been in the acceptable range for 10<br />

minutes the system should shut off.

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