A redundant automation system including a set of redundant PLCs including of a pair of PLCs each equipped with two communication couplers. In at least one embodiment, the GMM circuit includes a common compute block to generate feature a vector sum indicative of a weighted sum of differences squares between the feature vector and a mixture component of the GMM speech recognition algorithm. The computer-telephony controller refers to a mapping between the label value and an identifier of a communications terminal; and initiates the requested first computer-telephony event controlling operation of the communications terminal. A first transistor pair is coupled between the first p-channel transistor and the second n-channel transistor, and a second transistor pair is coupled between the second p-channel transistor and the first n-channel transistor. The through holes are each sized and shaped to receive a retaining pin extending through the first side of the nub and through the opposite side of the nub to thereby couple the tank wall section to a second tank wall section.