Siemens NCM S7 Manual De Usuario
Glossary
234
SIMATIC NET NCM S7 for Industrial Ethernet
Release 6/2003
C79000–G8976–C129–07
B.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.
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.
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.
–> server.
Configuration data
Parameters that determine the modes and functions of a –> CP. They are set
and downloaded using the NCM S7 configuration tool.
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 transmis-
sion technique.
sion 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 de-
stination address.
stination address.
Frame trailer
A frame trailer consists of a checksum and the end identifier of the –> frame.