General Section - Siemens SIMATIC NET S7-300 Manual

D.1

General Section

Baud rate
-> transmission rate
Broadcast
A broadcast is like "calling all stations": Using one broadcast frame, you can
reach all nodes that are prepared to accept broadcast frames.
Bus segment
Part of a -> subnet. Subnets can consist of bus segments and connectivity
devices such as repeaters and bridges. Segments are transparent for
addressing.
Client
A client is a device or, in general terms, an object that requests a service from a
-> server.
Configuration data
Parameters that determine the modes and functions of a-> CP. They are set and
downloaded using the NCM S7 configuration tool.
CP
Communications Processor. Module for communications tasks.
CSMA/CD
CSMA/CD (Carrier Sense Multiple Access with Collision Detection); a
transmission technique.
Frame
A message from one PROFIBUS/Ethernet station/node to another.
Frame header
A frame header consists of an identifier for the -> frame and the source and
destination address.
Frame trailer
A frame trailer consists of a checksum and the end identifier of the -> frame.
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
D Glossary
A -297