Introduction
III
INTRODUCTION
The TP303 is from the first generation of Profibus-PA devices. It is a transmitter for position
measurements. It can measure displacement or movement of rotary or linear type. The digital
technology and communication provide an easy interface between the field and control room and
several interesting features that considerably reduce the installation, operation and maintenance
costs.
The TP303 is versatile and reliable, and has very high accuracy. It may be used for control valve
stem position measurement, or in any other position sensing application such as louvers, dampers,
crushers, etc.
Since the TP303 uses a non-contact magnetic coupling for position sensing, it less sensitive to
vibration than other solutions, resulting in longer operational life. Deadband due to mechanical
imprecision is avoided. The TP303 mounts to any linear or rotary valve, actuator or a variety of other
devices through the use as VDI/VDE and IEC/NAMUR etc.
The TP303 is very versatile; users can standardize one position indicator for all different kinds of
control valves and other machines, keeping spares and training to a minimum.
The TP303 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 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 TP303, 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 be
configured locally using a magnetic tool, eliminating the need for a configurator or console in many
basic applications.
The TP303 is available as a product on its own, but also replaces the circuit board for the TP301.
They use the same sensor board. Refer to the maintenance section of this manual for instructions
on upgrading. The TP303 uses the same hardware and housing for the TP302.The TP303 is part of
Smar's 303 Series of Profibus-PA devices.
The TP303, like its predecessor TP301, 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 TP303 by carefully reading these instructions.
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