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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
IF303 may be configured by a third party terminal or operator console.
The
IF303 contains three input transducer blocks, one physical block, one display transducer block ,
three analog input and three totalizer function blocks.
Function Blocks are not covered in this manual. For explanation and details of function blocks, see
the “Function Blocks Manual”.
Offline Configuration
1. First run “Download to PG/PC” option to assure valid values.
2. Run after the Menu Device option to configure the required parameters using the related menus.
NOTE
It is not advisable to use the “Download to Device” option. This function can misconfigure the equipment.
Transducer Block
Transducer block insulates function block from the specific I/O hardware, such as sensors and
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 blocks
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 Input/Output Function blocks is called channel.
Normally, transducer blocks perform functions, such as linearization, characterization, temperature
compensation, control and exchange data to/from hardware.
How to Configure a Transducer Block
The transducer block has an algorithm, a set of contained parameters and a channel connecting it to
a function block. 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, 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 manufacturers specific ones are
defined only by 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 guide line to help the user to make common tasks. The
Configuration Tool identifies each method associated to the parameters and enables the interface
to it.
Terminal Number
The terminal number, which references a physical input, which is sent internally from the specified
transducer output to function block.
It starts at channel one (1) for transducer number one until channel three (3) for transducer number
three.
The channel number of the AI block and TOT block is related to the transducer’s terminal number.
Channel number 1, 2, 3 corresponds bi-univocally to the terminal block with the same number.
Therefore, all the user has to do is to select combinations: (1.1), (2.2), (3,3) for (CHANNEL,
BLOCK).