Siemens SIMATIC S5-135U System Manual

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2-2 System ManualC79000-G8576-C199-072.1 ApplicationThe S5-135U/155U programmable controllers comprise a central controller(CC) and, if required, one or more expansion units (EUs). You need EUswhen there are insufficient slots in the CC for the modules to be used.Various interface modules (IMs) are available for communication betweenthe CC and the EUs and between the EUs. It is therefore possible to install anEU or EUs in the immediate vicinity of the CC (centralized configuration) orat some distance (distributed configuration). A combination of both types ofconfiguration is also possible by connecting additional EUs in a centralizedconfiguration with a distributed EU (see Figure 2-5).This is clarified on the following pages.Centralized and Distributed Configuration of a Programmable Controller

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