| classification of control equipment through the functional command and communication relationships of its component parts or through its spatial and device-related arrangement Note 1 to entry: For control structures, a distinction is made between on the one hand functional command and communication structures and on the other hand spatial and device-related arrangements. In terms 351-55-09 to 351-55-11 and 351-47-38 to 351-47-40 centralized, decentralized and hierarchical are used exclusively in a functional sense. In the spatial and device-oriented sense the terms compact and distributed are used in 351-54-02 and 351-54-03. Note 2 to entry: This entry was numbered 351-31-08 in IEC 60050-351:2006.
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