Product Overview
Fieldbus Overview
A
F
OUNDATION
fieldbus
network consists of links and devices. A link is the
serial bus that connects the devices on the network. There are three types of
devices:
Links and Devices
●
Link master: The LevelPRO with
F
OUNDATION
fieldbus
has link
master capabilities. This device type controls communications traffic on
a link and prevents multiple devices from communicating data at the
same time. A link master may also be the Link Active Scheduler (LAS),
which is the device that is currently controlling access to the fieldbus. A
fieldbus network may have more than one link master per link, but
there may be only one LAS at a time.
●
Basic device: This device type can communicate on the fieldbus
network, but it cannot become the LAS.
●
Bridge: This device type connects two or more links in a fieldbus
network.
A device is identified by its device tag and device ID. The device tag is the
unique name you assign to it, and the device ID is a unique identifier
assigned by the manufacturer. The device ID cannot be changed.
Blocks
Blocks allow you to configure and control the fieldbus gauge. A block is
identified by its block tag, which is similar to the device tag. The block tag
uniquely identifies the block on the network.
Linkages connect two blocks and enable the transfer of data from one
function block to another. The LevelPRO supports the following blocks:
●
One resource block (RB): Contains device information, such as the
device tag and device ID.
●
One transducer block (TB): Allows you to configure or view setup
parameters and access system diagnostic tools.
●
One analog input block (AI): Makes manufacturer's input data
available to other functions at its output.
The figure below illustrates the default interconnections of the blocks.
1-2
LevelPRO with
F
OUNDATION
™ fieldbus
Application Guide
Thermo Fisher Scientific
Содержание LevelPRO Series
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