SMAR LD303, Operation And Maintenance Instruction Manual, Page: 3 / 110

Introduction
III
INTRODUCTION
The
LD303
is from the first generation of Profibus-PA devices. It is a transmitter for differential,
absolute and gauge pressure, level and flow measurements. It is based on a field-proven capacitive
sensor that provides reliable operation and high performance. The digital technology used in the
LD303
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.
The
LD303
is part of Smar's complete 303 line of Profibus-PA devices.
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 to be user friendly the function block concept was introduced.
The
LD303
, like the rest of the 303 family, has some Function Blocks built in, like Analog Input and
Totalizer Block.
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 configured locally using a magnetic tool, eliminating the need for a configurator or
console in many basic applications.
The
LD303
is available as a product on its own, but also replaces the circuit board for the LD301.
They use the same sensor board. Refer to the maintenance section of this manual for instructions
on upgrading. The
LD303
uses the same hardware and housing for the LD303.The
LD303
is part of
SMAR's
Series 303
of Profibus-PA devices.
The
LD303
, like its predecessor LD301, has some built-in blocks, eliminating the need for a
separate control device. The communication requirement is considerably reduced, and that means
less dead-time and tighter control is achieved, not to mention the reduction in cost. They allow
flexibility in control strategy implementation.
Get the best results of the LD303 by carefully reading these instructions.