Endress+Hauser iTEMP TMT85, Руководство по эксплуатации

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Operation via FOUNDATION Fieldbus TM
iTEMP TMT85
66 Hauser
14 Operation via FOUNDATION Fieldbus TM
14.1 Block model
With FOUNDATION Fieldbus
TM
, all the device parameters are categorized according to
their functional properties and task and are generally assigned to three different blocks. A
block can be regarded as a container that contains parameters and the functionalities
associated with these parameters. A FOUNDATION Fieldbus
TM
device has the following
block types:
• A Resource Block (device block):
The Resource Block contains all the device-specific features of the device.
• One or more Transducer Blocks:
The Transducer Blocks contain the measuring- and device-specific parameters of the
device.
• One or more function blocks:
The function blocks contain the automation functions of the device. A distinction is
made between different function blocks, e.g. Analog Input function block, Analog Output
function block, etc. Each of these function blocks is used to execute different application
functions.
Different automation tasks can be implemented depending on how the individual function
blocks are arranged and connected. In addition to these blocks, a field device may have
other blocks, e.g. several Analog Input function blocks if more than one process variable is
available from the field device.
1 x Advanced
Diagnostic
1 x Display
1 x Sensor 1
FOUNDATION
Fieldbus
TM
1 x Sensor 2
Resource
Block
3 x Analog Input
1 x Input Selector
Function Blocks
Transducer Blocks
Function Block
1 x PID
Function Block
max. 6 x
Analog Input
Function Blocks
A0042923
 19 TMT85 block model
14.2 Resource Block (device block)
The Resource Block contains all the data that clearly identify and characterize the field
device. It is like an electronic version of the field device nameplate. In addition to
parameters required to operate the device on the fieldbus, the Resource Block makes
information available such as the order code, device ID, hardware version, firmware
version, etc.
Another task of the Resource Block is to manage general parameters and functions that
have an influence on the execution of the remaining function blocks in the field device.
The Resource Block is therefore a central unit that also checks the device status and in
doing so influences and controls the operability of the other function blocks and therefore
of the device. The Resource Block does not have any block input and block output data and
therefore cannot be linked to other blocks.
The primary functions and parameters of the Resource Block are listed below.