Siemens NCM S7 appendix General Section

Models: NCM S7

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Glossary

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.

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 transmis- 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.

Frame trailer

A frame trailer consists of a checksum and the end identifier of the –> frame.

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SIMATIC NET NCM S7 for Industrial Ethernet

Release 6/2003

C79000–G8976–C129–07

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Siemens NCM S7 appendix General Section