2.6 PRACTICE PROBLEM SOLUTIONS
3. A PLC is a computer based controller that uses inputs to monitor a process, and uses outputs to control a process using a program.
5. A PLC could replace a few relays. In this case the relays might be easier to install and less expensive. To control a more complex system the controller might need timing, counting and other mathematical calculations. In this case a PLC would be a better choice.
6. The ladder logic outputs were modelled on relay logic diagrams. The output in a relay ladder diagram is a relay coil that switches a set of output contacts.
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