Emerson DeltaV™ Digital Automation System Concepts Function blocks
Function blocks are building blocks for creating the continuous and discrete
algorithms that perform the control or monitoring for the process. The DeltaV
Library contains function block templates for analog control (bias/gain, lead/lag,
PID, etc.), Logical, I/O (analog and discrete input/output), and other basic functions.
Each function block contains parameters that can be modified to customize the
algorithm. Algorithms range from simple input conversions to complex control
strategies. Function blocks can be combined into composite function blocks to build
complex algorithms.
In addition to Function Block algorithms, the DeltaV system supports Sequential
Function Charts (SFCs) as well as Command-driven and State-driven algorithms
for control tasks requiring sequencing strategies.
Parameters are the user-defined data used within a module’s algorithm to perform its
calculations and logic. Parameters can be described by the type of information they
provide, such as input or output. Tables listing the parameters and their properties are
included in the Books Online information.
The DeltaV system includes a library of pre-engineered module templates with basic
characteristics. You can customize these library modules or create your own modules
from scratch. Your customized modules can be added to the library, making them
available for reuse in the development of your control strategy.