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.