The correct answer is C. both (a) and (b).
A programmable controller (PLC) is a solid-state electronic device that uses a programmable memory to store instructions for controlling various types of machines. PLCs are used in a wide variety of industries, including manufacturing, process control, and transportation.
One of the advantages of PLCs is that they allow faster machine checkout than standard relay logic. This is because PLCs can be programmed off-line, which means that the machine does not need to be shut down while the programming is being done. This can save a significant amount of time, especially for large or complex machines.
Another advantage of PLCs is that they are easier to troubleshoot than standard relay logic. This is because PLCs have a built-in diagnostic system that can help to identify the source of problems. Additionally, PLCs can be programmed to generate error messages, which can be helpful in troubleshooting problems.
Overall, PLCs offer a number of advantages over standard relay logic, including faster machine checkout and easier troubleshooting. These advantages make PLCs a popular choice for machine control applications.
Here are some additional details about each option:
- Option A: A programmable controller allows faster machine checkout. This is because PLCs can be programmed off-line, which means that the machine does not need to be shut down while the programming is being done. This can save a significant amount of time, especially for large or complex machines.
- Option B: A programmable controller is easier to troubleshoot than standard relay logic. This is because PLCs have a built-in diagnostic system that can help to identify the source of problems. Additionally, PLCs can be programmed to generate error messages, which can be helpful in troubleshooting problems.
- Option C: Both (a) and (b). This is the correct answer, as PLCs offer both of the advantages mentioned in options A and B.
- Option D: All of the above. This is not the correct answer, as option C is the only option that is supported by the evidence.
- Option E: None of the above. This is not the correct answer, as option C is the only option that is supported by the evidence.