I/O Module Functionality; Data Scanning Principles - ABB S800 I/O User Manual

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The transportation of dynamic data between the Advant Fieldbus 100 and the
ModuleBus is the main task for the FCI. The FCI has a dedicated memory area
where it sends the output values and reads the input values. The CPU in the FCI
performs the rest of the data transportation. It reads output values from the memory
and writes to the I/O Modules via the ModuleBus and vice versa.
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The data transfer between Advant Fieldbus 100 and the ModuleBus is not
synchronized. Read and write operations are performed from and to a dual port
memory in the FCI.
The ModuleBus data is scanned (read or written) cyclically, depending on the I/O
module configuration. On one scan all digital modules, 1/4 of the analog modules
and 1/10 of the slow analog modules are scanned. It takes 4 scans to read all analog
modules and 10 scans to read all slow analog modules.
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All S800 I/O modules have some common functionality. This makes it easier for the
other parts in the system, that is, the Advant Controller, the I/O Station,
the configuration tools and above all for the user. This section describes these
common functions of the I/O modules.
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3BSE 020 925R101