ABB S800 I/O Manual page 62

Functional Description
The FCI is responsible for:
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Module Configuration and Supervision
The FCI stores the configuration for all configured I/O Modules in the station.
The FCI will continuously supervise all I/O modules being configured by the
PROFIBUS Master. It sends the status of all modules to the PROFIBUS Master via
PROFIBUS-DP/DPV1.
When the FCI detects an I/O module without configuration, which it has
configuration data for, it will automatically load the parameters to the module.
The module is then automatically set into operation by the FCI.
Signal Conditioning
The FCI performs the signal conditioning (for example, linearization and filtering)
for the more basic I/O modules. This means that the FCI has to make some
computation before moving the value to the module or after reading the value from
the module. The type of signal conditioning to perform depends on the module type
and its configuration (parameter settings).
Intelligent I/O modules do signal conditioning themselves. In this case the FCI only
has to move the value to or from the module. This means less load on the FCI which
can be used on other modules or services.
Dynamic Data Transfer
Figure 18
transferred back and forth between the user application and the actual process.
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Module configuration and supervision.
Performing signal conditioning on input and output values.
Dynamic data transfer.
gives an overview of how the exchange of dynamic process data is
Section 4 Operation
3BSE020926-600