SMAR fy303, Operation, Maintenance & Instruction Manual

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FY303 – Operation, Maintenance and Instructions Manual
2.4
Introduction to Fieldbus Application
From a Fieldbus point of view, the
FY303 is not an assembly of electronics, housing and sensor
forming a positioner, but a network node containing function blocks.
Basically, it contains one output transducer block, one resource block, one display transducer block
and Analog Output block.
These blocks are models of the functionality that the
FY303 provides for a control system. They can
loosely be said to make up part of the application that is performed in the FY303 .
Function Blocks
Models the basic user configurable functionality of the device. Typically this functionality was
previously available in individual devices. For example, the analog output block
provides the
functionality of what is known as a positioner. It makes the Fieldbus signal available to the FY303
output hardware. It also optionally performs output reversing.
All information regarding to Function Blocks are available on the “Function Blocks Instruction
Manual”.
Transducer Blocks
These are responsible for the interface between the function blocks and the
FY303 output channel
hardware.
Output transducer block
It is responsible for the processing of the output signal, such as output characterization and trim.
Display transducer block
It is responsible for the display and local adjustment.
Physical Block
It is responsible for monitoring the operation of the device. It also contains device information such
as serial equipment number.
The Local Indicator
The local indicator is required for signaling and operation in local adjustment. The parameters
desired by the user to be viewed on the LCD display should be configured in the display block.
Normal Indicator
During normal operation, the FY303 remains in the monitoring mode and the display will always
indicate the variable of monitoring configured in the display block. The user can configure up to six
parameters and chooses up to two to switching on the LCD. For details, please see the general
manual. It is recommended configuring the position of the valve in % (percentage).
The possible configuration and monitoring operation are shown on.