ABB EL3020 Gas Controller

An S800 I/O Station can consist of a base cluster and up to 7 additional I/O clusters. The basecluster consists of a Fieldbus Communication Interface and up to 12 I/O modules. I/O clusters 1 to 7 consist of an Optical Modulebus modem and up to 12 I/O modules. An S800 I/O Station can have a maximum of 24 I/O modules. I/O clusters 1 to 7 are connected tothe FCI module through an optical expansion of the Modulebus.

The Fieldbus Communication Interface module communicates with its I/O modules over the Modulebus. The Modulebus can support up to 8 clusters, one base cluster and up to 7 I/O clusters. The base cluster consists of a communication interface module and I/O modules. An I/O clusterconsists of an Optical Modulebus modem and I/O modules. The Optical Modulebus modems areconnected via optical cables to an optional Modulebus Optical port module on the communicationinterface module. The maximum length of the Optical Modulebus expansion is dependent on thenumber of Optical Modulebus modems. The maximum length between two clusters is 15 m (50 ft.) with plastic fibre and 200 m (667 ft.) with glass fibre. Factory-made optical cables (plasticfibre) are available in lengths of 1.5, 5 and 15 m (5, 16 or 49 ft.). The Optical Modulebusexpansion can be build up in two ways, a ring or a duplex communication.

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