KROHNE IFC 090 i Converter FOUNDATION FIELDBUS - Manual (Page 8)

Supplementary Documentation Page 8 of 44
IFC090, IFC090 i with FF
Foundation Fieldbus Principles
IFC090 FF 01/2006
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3.2 Transducer Block
Transducer Blocks represent the interface between the device specific hardware (i.e. input/output functions) and
the FF specified Function Block model. Since there might be multiple functions in a device (measurement
values, positioning functions, etc), an FF device can have several Transducer Blocks1.
They provide device specific information in terms of sensor/actuator functions (e.g. type of sensor, range of
process value, etc) and they make available the process values to the function blocks or provide the actuator
input values obtained from function blocks to the hardware respectively.
3.3 Function Blocks
The main functional behavior of the FF device is implemented in one or several Function Blocks. Depending on
the device type there are Input Blocks (e.g. flow device → Analog Input Block, Discrete Input, etc), Output
Blocks (e.g. valve → Discrete Input, etc), or Control Blocks (PID, etc). These blocks have input and/or output
parameters to be linked to other devices and to control systems by the Fieldbus.
1 Note: This does not imply that an FF device has to have several Transducer Blocks if it provides several
functions.