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Section 3
3.1
CONFIGURATION
One of the many advantages of Fieldbus is that device configuration is independent of the
configurator. The
TP302 may be configured by a third party terminal or operator console.
The
TP302 contains one input transducer block, one resource block, one display block and function
blocks.
Transducer Block
Transducer block insulates function block from the specific I/O hardware, such as sensors,
actuators. Transducer block controls access to I/O through manufacturer specific implementation.
This permits the transducer block to execute as frequently as necessary to obtain good data from
sensors without burdening the function blocks that use the data. It also insulates the function block
from the manufacturer specific characteristics of certain hardware.
By accessing the hardware, the transducer block can get data from I/O or passing control data to it.
The connection between transducer block and function block is called channel. These blocks can
exchange data from its interface.
Normally, transducer blocks perform functions, such as linearization, characterization, temperature
compensation, control and exchange data to hardware.
How to Configure the Transducer Block
Each time when you select a field device on Syscon by instantiating on the operation menu,
automatically you instantiate one transducer block and it appears on screen.
The icon indicates that one transducer block has been created and by clicking twice on the icon, you
can access it.
The transducer block has an algorithm and a set of contained parameters.
The algorithm describes the behavior of the transducer as a data transfer function between the I/O
hardware and other function block. The set of contained parameters, it means, you are not able to
link them to other blocks and publish the link via communication, defines the user interface to the
transducer block. They can be divided into standard and manufacturer specific.
The standard parameters will be present for such class of device, as pressure, temperature,
actuator, etc., whatever is the manufacturer. Oppositely, the manufacturer’s specific ones are
defined only for its manufacturer. As common manufacturer specific parameters, we have calibration
settings, material information, linearization curve, etc.
When you perform a standard routine as a calibration, you are conducted step by step by a method.
The method is generally defined as guideline to help the user to make common tasks. The Syscon
identifies each method associated to the parameters and enables the interface to it.
Position Fieldbus Transducer
Description
The position Fieldbus transducer makes the position input reading PRIMARY_VALUE available to
the AI block. The engineering unit and the primary value range are selected from the XD_SCALE in
the AI block. The only unit allowed is this case is %. The AI block connected to this transducer has
the CHANNEL the same selection as TERMINAL_NUMBER. The supported mode is OOS and
AUTO. As the transducer block runs together with AI block, the transducer block goes to AUTO only
if the AI mode block is already in AUTO. The sensor module temperature may be read from the
SECONDARY_VALUE parameter.
Warning messages may appear in primary value status or in the block error in certain condition as
explain below.