Figure 1.5 Fieldbus Devices Contain Device Applications And Function Blocks - Flowserve Logix 3400IQ User Instructions

Application
An application is software that contains function block data and operating parameters (objects)
which help define the operation of a device such as, sensor data acquisition or control algorithm
processing. Some devices may contain more than one application.
Function Blocks
Usually, a device has a set of functions it can perform. These functions are represented as function
blocks within the device. See Figure 1.5. Function blocks are software that provide a general structure
for specifying different device functions. Each function block is capable of performing a control func-
tion or algorithm. Device functions may include analog input, analog output, and Proportional Integral
Derivative (PID) control. These blocks can be connected together to build a process loop. The action
of these blocks can be changed by adjusting the block's configuration and operating parameters.
Function Block
Block Parameters
Function Block
Block Parameters
Figure 1.5 Fieldbus Devices Contain Device Applications and Function
Logix 3400IQ Digital Positioner Interface Application
The Logix 3400IQ digital positioner contains the electronics interface compatible for connecting to a
fieldbus network. Logix 3400IQ digital positioner application is configured using a fieldbus configura-
tion software program. The NI-FBUS Configurator software allows the user to configure blocks,
change operating parameters and create linkages between blocks that make up the Logix 3400IQ
digital positioner application. The changes to the Logix 3400IQ digital positioner application are then
written to the device and initialized.
Fieldbus Device
Device Application
Function Block
Block Parameters
Function Block
Block Parameters
Fieldbus LAN
Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
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