Open loop control system can be modified in to closed loop control system by providing a feedback.
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Hence closed loop control system is called automatic control system.
When ground wiring is not done properly, grounding of various points is not effective and potential differences exist between them resulting in currents flowing between them.
A fieldbus is a multidropping arrangement where multiple instruments communicate with special interface hardware using the same pair of wires and in most of the cases draw power from the same pair of wires.
Control System in which output quantity has no effect on the input quantity is called Open Loop Control System.
In Open loop control system the output can be varied by varying the input.
But due the external disturbance system output may change.Any variation in the output from the desired once again attained by varying the inputs manually.Advantages: Control system in which the output has an effect on the input quantity in such a manner that the input quantity will adjust itself based on the output generated is called Closed loop Control System.If the instrument is a handheld meter, then a grounded probe can almost always be used.The magnitude of the thermoelectric voltage depends on the closed (sensing) end as well as the open (measuring) end of the particular thermocouple alloy leads. You can't impress me, but I still expect you to try.