15 Fieldbus specification
These instructions are based on the following:
4
Fieldbus Foundation Specification "Function Block Application Process Part 1 to 3"
Revision 1.5.
4
Fieldbus Foundation Specification "Transducer Block Application Process Part 1 to 2"
Revision PS 3.0.
15.1 Device description (DD)
The following device description files are needed to integrate the device described into the
host system:
Device Description: < 0101.ffo >, < 0101.sym > Capabilities File: < 010101.cff >
These device description files can be downloaded from the Internet, for example, at
www.fieldbus.org or www.samson.de.
15.2 FOUNDATION™ fieldbus block model
FOUNDATION™ fieldbus assigns all the functions and data of a device to three different
types of blocks. Each type of block has a different range of tasks to fulfill in the block model.
The following types of blocks are implemented in the SAMSON Type 3730-5 Positioner:
4
One Resource Block
The Resource Block contains all the specific characteristics associated with a device on the
Fieldbus, for example, device name, manufacturer number and serial number.
A device can only have one Resource Block.
4
One AO Transducer Block
Each AI or AO Function Block has a Transducer Block which contains all data and de
-
vice-specific parameters to connect the device to the process value (sensor or actuator).
The positioner output signal can be directly influenced over the AO Transducer Block.
4
Two DI Transducer Blocks
The DI Transducer Blocks connect binary input signals for transmission and processing
over the fieldbus.
4
One Analog Output Function Block
Function blocks are responsible for the control behavior of a F
OUNDATION™ fieldbus
device. A F
OUNDATION™ fieldbus application can be configured by connecting the in
-
puts and outputs of function blocks.
EB 8384-5 EN 75
Fieldbus specification
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