SMAR if303, Руководство по эксплуатации, техническому обслуживанию и инструкциям, Страница: 3 / 52

Introduction
III
INTRODUCTION
The IF303 is a converter mainly intended to interface analog transmitters to a Profibus PA network.
The IF303 receives up to three current signal typically 4-20 mA or 0-20 mA, and makes them
available to Profibus PA system. The digital technology used in the IF303 enables an easy interface
between the field and the control room and it has several interesting features that reduce
considerably the installation, operation and maintenance costs.
The
IF303 is part of SMAR's complete 303 line of Profibus PA devices.
Profibus PA, is not only a replacement for 4-20 mA or intelligent/smart transmitter protocols, it
contains much more.
The digital technology used in the
IF303 enables the choice of several types of transfer functions, an
easy interface between the field and the control room and several interesting features that
considerably reduce the installation, operation and maintenance costs.
Some of the advantages of bi-directional digital communications are known from existing smart
transmitter protocols: Higher accuracy, multi-variable access, remote configuration and diagnostics,
and multi-dropping of several devices on a single pair of wires.
The system controls variable sampling, algorithm execution and communication so as to optimize
the usage of the network, not loosing time. Thus, high closed loop performance is achieved.
Using Profibus technology, with its capability to interconnect several devices, very large control
schemes can be constructed. In order too be user friendly the function block concept was introduced
The
IF303 , like the rest of the 303 family, has some Function Blocks built in, like Analog Input and
Totalizer Blocks.
The need for implementation of Fieldbus in small as well as large systems was considered when
developing the entire 303 line of Profibus-PA devices. They have common features and can be
configured locally using a magnetic tool, eliminating the need for a configuration tool or console in
many basic applications.
Get the best result of the
IF303 by carefully reading these instructions.
This product is protected by US patent number
5,706,007 .