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Glossary
These are explanations of the most important technical terms and
abbreviations from the manual.
Advanced
PPI
The extension of the PPI protocol of the S7-200 series, normally only com-
patible with CPUs of the S7-22x series and higher
ANP See
auto negotiation
ASCII
American Standard Code for Information Interchange describes a character
set that includes the Latin alphabet in upper and lower case, the ten Arabic
numerals, as well as some punctuation marks and control characters
Autobaud
Also called "auto sensing," is a function supporting automatic adjustment
of the baud rates in a network
Auto
negotiation
ANP describes a function that automatically recognizes and configures
communication partners in the network
Baudrate
The speed set on a bus system
Bit
Binary digit describes the smallest digital information unit. Defines 0 or 1
Broadcast
Data packet transmitted to all stations in a network
Browser
Also known as Web browser, is a program for viewing Internet pages. In
addition to addressing and referencing other positions in the text, a
graphical user interface be displayed, for example Web interface.
Bus
Buses are connection systems for electronic components. For example, the
MPI Bus is a connection medium for S7
Byte
A byte denotes a series of 8 bits that constitute a logical data entity
CAT5-TCP
cable
Category 5 Ethernet cable that supports a data rate of 100 Mbps over a dis-
tance of 100 m
Client
A device that requests services. The requests are sent to a server, which re-
turns the relevant answers to the client.
Computer
In this manual, this refers to the programmer (PG) or personal computer
(PC).
DHCP
Dynamic Host Configuration Protocol, DHCP server
can dynamically pass
an -> IP address and other parameters to
DHCP clients on request.
DNS
Domain Name System is a shared database system in LAN as well as in the
internet that transforms IP addresses into plain text addresses
Domain
name
The domain is the name of an Internet page. It consists of the name and
an extension. The domain of Systeme Helmholz is: www.helmholz.de
Firewall
A service running on a server that blocks certain services/ports and prohib-
its unauthorized access
Flow
Control:
A process that sends a break frame if the data buffer is almost full.
Gap
The Gap Update Factor specifies after how many token cycles the master
checks whether an additional master is signaling its presence on the bus
Gateway
This is a machine that works like a router. Unlike a router , a gateway can
also route data packets from different hardware networks.
