.Modelica_LinearSystems2.Controllers.Types.PID_representation .Modelica_LinearSystems2.Controllers.Types.PID_representationtype PID_representation = enumeration(gains "Gains representation: G_PID = kp + ki/s + kd*s", timeConstants "Time constants representation: G_PID = k*(1 + 1/Ti/s + Td*s)");