Abstract: A method is described for acquiring data for relay-based controller tuning of a controller controlling a system. The method includes determining, based on controller output constraint, a relay amplitude representing an amplitude of a relay signal to be added to steady state controller output to obtain a sum signal to be fed to the system as system input during the acquiring data for relay-based controller tuning; and starting acquiring controller output data and system output data when detecting a steady state of system output while controller output is fed to the system as system input.

Abstract: A subsea communication adapter for providing communication between a first subsea unit including a communication interface operating according to a first communication method and a second subsea unit including a communication interface operating according to a second communication method is provided. The subsea communication adapter includes a first communication interface operating according to the first communication method and a second communication interface operating according to the second communication method. A conversion unit is configured to convert between the first communication method and the second communication method. The conversion includes at least a conversion between a first communication protocol of the first communication method and a second communication protocol of the second communication method.

Abstract: A method is described for acquiring data for relay-based controller tuning of a controller controlling a system. The method includes determining, based on controller output constraint, a relay amplitude representing an amplitude of a relay signal to be added to steady state controller output to obtain a sum signal to be fed to the system as system input during the acquiring data for relay-based controller tuning; and starting acquiring controller output data and system output data when detecting a steady state of system output while controller output is fed to the system as system input.

Abstract: A method for detecting a steady-state in a process plant, the method includes: receiving a process value of the process plant, determining a recursive mean of the process value, calculating an arithmetic mean of the process value within a pre-determined window, determining a standard deviation of the process value within the pre-determined window and based on the calculated arithmetic mean, determining an upper limit and a lower limit of the process value based on the recursive mean of the process value and on the determined standard deviation, determining whether the calculated arithmetic mean is between the determined upper limit and the determined lower limit, and if the calculated arithmetic mean is between the determined upper limit and the determined lower limit, generating a first index indicating that the calculated arithmetic mean is between the determined upper limit and the determined lower limit.

Abstract: A subsea communication adapter for providing communication between a first subsea unit including a communication interface operating according to a first communication method and a second subsea unit including a communication interface operating according to a second communication method is provided. The subsea communication adapter includes a first communication interface operating according to the first communication method and a second communication interface operating according to the second communication method. A conversion unit is configured to convert between the first communication method and the second communication method. The conversion includes at least a conversion between a first communication protocol of the first communication method and a second communication protocol of the second communication method.

Abstract: A subsea communication device is configured for data communication with a topside device over a first communication link. The subsea communication device includes a plurality of second interface units for data communication with plural subsea units over second communication links which are point-to-point communication links. A processing circuit of the subsea communication device is provided for signal and data conversion.