Allen-Bradley 1757-FFLD2, Руководство пользователя

Страница: 20 / 184

20 Rockwell Automation Publication 1757-UM012A-EN-P - July 2011
Chapter 2 RSFieldbus Software Basics
Strategy Window The Strategy window shows a graphic representation of the blocks, parameters,
and links in a control strategy.
To open the Strategy window, you must first create a control module.
See page 48 for more information.
Function Blocks and Parameters
Functions that can be performed by a device are represented as function blocks.
The set of function blocks available is dependent on the types of devices on your
fieldbus network. Function blocks contain algorithms and algorithm-controlling
parameters.
The standard blocks for fieldbus devices include the following:
You can change or set the action of a block by changing the settings of its
parameters. A block parameter that is written to the bus is referred to as an output
parameter. A block parameter that is receiving data is referred to as an input
parameter.
Blocks are linked, or connected, inside the devices. These links let you send data
from one block to the other block. Links connect blocks within the same device
and blocks that are in different devices.
For more information on function blocks, see Chapter 2 in the
FOUNDATION Fieldbus Design Considerations Reference Manual,
publication
RSFBUS-RM001 .
•
Analog Input (AI)
•
Discrete Output (DO)
•
Analog Output (AO)
•
Proportional Derivative (PD)
•
Discrete Input (DI)
•
Proportional Integral Derivative (PID)