All I/O modules are connected to a high speed Bus Interface Module (BIM) via a proprietary bus system called “Railbus” and one BIM can control up to 32 modules. The module carrier provides the transmission medium for the Railbus and by plugging a module onto a carrier, connections are made between the module and the bus. The connectors on the carrier also provide the power supply links to the module. Additionally, 2/1 modules can use intrinsically safe wiring to send and receive signals into hazardous areas.

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