Appendix; Block Model - Endress+Hauser iTEMP TMT 165 FOUNDATION Fieldbus Betriebsanleitung

FOUNDATION Fieldbus temperature transmitter
Endress+Hauser
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Appendix

11.1 Block model

In the FOUNDATION Fieldbus all the device parameters are categorised according to
their functional properties and task and are generally assigned to three different blocks.
A block may be regarded as a container in which parameters and the associated
functionalities are contained. A FOUNDATION Fieldbus device has the following block
types:
• A Resource Block
The resource block contains all the device-specific characteristics of the device.
• One or more transducer blocks (transmission blocks)
The transducer block contains all the measuring technology and device-specific
parameters of the device. The measurement principles (e.g. flow, temperature) are
depicted in the Transducer blocks in accordance with the FOUNDATION Fieldbus
specification.
• One or more function blocks
Function blocks contain the automation functions of the device. We distinguish
between different function blocks, e.g. Analogue Input Function Block, Analogue Out-
put function block, PID function block (PID controller), etc. Each of these function
blocks is used to process different application functions.
Different automation tasks can be realised depending on the arrangement and
connection of the individual blocks. In addition to these blocks, a field device may have
any number of further blocks, e.g. several Analogue Input Function Blocks if more than
one process variable is available to from the field device.
Blocks used by the TMT 165
The TMT 165 has the following blocks:
• A Resource Block
• A Transducer Block for the measuring principle flow
• Three function blocks
• Two Analogue Input Function Blocks for the process variables
Volume Flow and Totaliser
• A PID function block
The sensor signal is first prepared specifically for the temperature in the measuring
block (the transducer block). The process variable is then passed to the Analogue Input
Function Blocks for technical processing (e.g. scaling, limit value processing). The
process variables go through the complete function block algorithm and are available
to other function blocks, e.g. the PID block, as a starting variable for connecting the
desired application function.
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