S400 Remote I/O Units makes it possible to distribute the system’s inputs and outputs to distances of up to 750 m from the Process Station. The Process Station and the various I/O units communicate via the ABB MasterFieldbus serial bus
The laying of cable represents a major part of the costs involved in such a system. For this reason it is obviously advantageous to be able to transmit a large number of signals serially between the Process Station and one I/O unit and to have separate signal wires only between the I/O unit and the process. The more spread out the process, the greater the advantages offered by Distributed I/O.
S400 I/O for Advant Master Life cycle status
S400 I/O moved into the Classic life cycle phase in 1999, to Limited in 2005 and finally to the Obsolete phase in 2015.
ABB strongly recommends customers to evolve S400 remote I/O to S800 I/O by the use of S800 I/O evolution kits, enabling a quick and easy replacement.