Central Pneumatic 43760 Specifications download pdf (Page 21)

Section 3

3.1

CONFIGURATION

This section describes the TT383 blocks. They follow the Profibus PA specifications, but concerning

the transducer blocks, the input transducer block and display, they have some special features. The

303 Smar family is integrated in Profibus View, from Smar and in the Simatic PDM, from Siemens.

It is possible to integrate any Smar device in Profibus with any configuration tool for Profibus PA

devices. It is necessary to provide a Device Description or Drive according to the configuration tool.

In this manual it is possible to find some examples using Profibus View or Simatic PDM.

In order to assure correct values in the offline configuration, first run “Download to PG/PC” option to

assure valid values. After, run the Menu Device option to configure the required parameters using

the related menus.

NOTE

In offline configuration, it is not recommendable to use the “Download to Device” option. This

function can misconfigure the equipment.

Transducer Block

Transducer block insulates function blocks from the specific I/O hardware, such as sensors,

actuators. Transducer block controls access to I/O through manufacturer specific implementation.

This allows the transducer block to execute as frequently as necessary to obtain good data from

sensors without burdening the function blocks that uses 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 a Transducer Block

The transducer block has an algorithm which is a set of contained parameters. It means that it is no

possible to link these parameters to other blocks and publish this link via communication 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 transducer parameter cannot be linked in input and output of

others blocks.

The transducer parameters can be divided in manufacturers’ standard and specific parameters.

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 for its manufacturer. As common manufacturer specific parameters, we have calibration

settings, material information, linearization curve, etc.

When you perform a standard routine such as calibration, you are guided step by step by a method.

The method is generally defined as guideline to help the user to make common tasks. The

Configuration Tool identifies each method associated to the parameters and enables the interface to

it.

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Central Pneumatic 43760 Specifications Page 21