Siemens SIMATIC NET S7-300 User Manual

D Glossary
A-297
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
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.

Siemens SIMATIC NET S7-300 Specifications

General

Product Type Designation	SIMATIC NET S7-300
Mounting	DIN rail mounting
Protection Class	IP20
CPU Models	Various models available (e.g., CPU 312, CPU 314)
Communication Interfaces	MPI, PROFIBUS DP
Power Supply	24 V DC power supply required. Different power supply modules available.
I/O Modules	Digital input modules, digital output modules, analog input modules, analog output modules
Programming	STEP 7 software
Supply Voltage	24V DC or 120/230V AC (depending on model)
Digital Inputs	Available via digital input modules
Digital Outputs	Available via digital output modules
Analog Inputs	Available via analog input modules
Analog Outputs	Available via analog output modules
Communication Functions	MPI, PROFIBUS DP, Ethernet (depending on model)
Protocols	MPI, PROFIBUS DP, TCP/IP (depending on model)
Operating Temperature	0°C to 60°C
Storage Temperature	70 °C
Memory	Depends on CPU model (e.g., 32 KB to 1.5 MB)