Siemens SIMATIC NET S7-300 User Manual

5 Configuring Communication Connections
A-103
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
5.3 Connections
Characteristics of a Connection
A communication connection allows program-controlled communication between
two nodes on Industrial Ethernet with the following characteristics:
 The data transfer is bi-directional, in other words, it is possible to transmit and
receive on the connection simultaneously.
 Both stations have the same rights, in other words, each station can trigger the
send and receive procedures in response to events.
 The address of the communication partner is specified in the configuration.
Exceptions to this are:
- free UDP connections
Here, the address is specified at the FC interface in the user program.
- programmed communication connections (see Chapter 6)
Communication
connection
Ethernet CP
Ethernet
node
SIMATIC S7 station
with Ethernet CP
receive
send
receive
send
Ethernet
node
receive
send
receive
send
Communication
connection
Figure 5-2 Sending and Receiving via one Communication Connection

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)