Rockwell Automation 2711 PanelView 550/900 Profibus Communications User Guide - Manual (Page 42)

PROFIBUS DP Communications 42
Publication 2711-6.3
The following are terms you may see when working with
PROFIBUS communications. Also refer to the glossary in the
PanelBuilder User Manual.
CONSISTENCY
The PROFIBUS DP protocol allows the association of “data
consistency requirements with blocks of data exchanged between a
PLC master and its slaves. A “consistent” block of data must always
be read or written as a whole because contained data is not
independent. For example, when a block holds both real data and
data identification, or when data granularity exceeds 2 bytes (e.g.
floating point data).
DP
acronym for Decentralized Periphery. A German standard (DIN
19245/Part3) which specifies a simplified user interface with
PROFIBUS Link Layer services and protocol for use with
decentralized peripherals.
ELECTRONIC DATA SHEET
a file with a .gsd extension that is created each time a PanelView
application is generated. The PROFIBUS network manager may
have the ability to read and automatically extract the required
network information.
GSD
File extension for the electronic data sheet. An electronic data sheet
(.gsd) is created each time a PanelView application is created.
MODULE
PROFIBUS DP nomenclature for data grouped together for
transmission over the network.
MULTIPLEX BLOCK
The blocks (1 through 127) that are transferred only when a request
is made by the DP Master. Each multiplex block contains up to 15
words of data.
MULTIPLEX MODULE
Up to 16 words of data grouped together for transmission. Each
multiplex module consists of a command/status word (word 0) and a
multiplexed data block up to 15 words.
PROFIBUS
acronym for PROcess FIeld BUS. A German standard (DIN 19245 /
Part 1, 2 and 3) which specifies a fieldbus for communications at the
process level.
PANELBUILDER
A Microsoft Windows based program for developing applications for
a PanelView terminal.
Glossary