Rockwell-automation 1788-FFCT NI-FBUS Configurator User Manual Manual de usuario descargar pdf (Pagina 78)

Publication 1788-UM052B-EN-P - April 2002

G-2

function block A named block consisting of one or more input, output, and

contained parameters. The block performs some control function

as its algorithm. Function blocks are the core components you

control a system with. The Fieldbus Foundation defines standard

sets of function blocks. There are ten function blocks for the most

basic control and I/O functions.

function block a fieldbus application that you create using F

OUNDATION Fieldbus

application

IEC International Electrotechnical Commission. A technical standards

committee which is at the same level as the ISO.

input parameter a block parameter that receives data from another block

ISA International Society for Measurement and Control

LAS see Link Active Scheduler

link a group of fieldbus devices connected across a single wire pair

with no intervening bridges

Link Active Schedule a schedule of times in the macrocycle when devices must publish

their output values on the fieldbus

Link Active A device that is responsible for keeping a link operational. The

LAS

Scheduler executes the link schedule, circulates tokens, distributes time and

probes for new devices.

Link master device a device that is capable of becoming the LAS

linkage a connection between function blocks

loop see control loop

Prefix meaning milli- and has a value of 10

-3

macrocycle the least common multiple of all the loop times on a given link

ML Manual Loader

OD object dictionary

OOS out of service

output parameter a block parameter that sends data to another block

PD Proportional Derivative

PID Proportional Integral Derivative

RC Ratio Control

s seconds

Term Definition

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Rockwell-automation 1788-FFCT NI-FBUS Configurator User Manual Manual de usuario Pagina 78