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According to their control action, industrial controllers can be classified as follows

141. According to their control action, industrial controllers can be classified as follows:

1. ON - OFF Controller
2. Proportional Controller
3. Integral Controller
4. All of the above

Answer: D) All of the above

Explanation:

According to their control action, industrial controllers can be classified as follows:

1. ON - OFF Controller
2. Proportional Controller
3. Integral Controller