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This Paper is about the Impressed Current Cathodic Protection (ICCP) control and monitoring system, which brings protection against the corrosion of the ship's hull in the sea. Protection of the ship's hull can be made because iron's corrosion potential can be transferred to an immunity range when the ICCP system compels a protective current to be sent to the ship's hull. The ICCP system is composed of a power supply, anode, reference electrode and controller. AC sources from the ship's generator are converted to DC sources in terms of power supply, and a protective current is sent to ship's hull though anode. The controller operates to increase the protective current at the anode if the value of the detected potential is lower than that of the setting potential, but it operates to decrease it if the former is higher than the latter. The controller fully senses whether or not the detected potential is within a range of protection and then it is automatically controlled to increase or decrease the amount of protective current to be sent to the anode. The monitoring system with RS 232/485 communication is also studied in order to check the normal state of the system at a long distance, because an operator does not always watch over this system and thus the system cannot operate well because of his or her negligent management. I suggest that this system can accomodate a vessel's automation and will be very useful.

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