Siemens SIMATIC NET S7-300 User Manual

1 Communication via Ethernet CPs in S7 Stations
A-27
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
1.4 S7 Communication on Industrial Ethernet
Application
S7 communication via Industrial Ethernet allows program-controlled
communication using communication SFBs/FBs via configured S7 connections.
Per job, up to 64 Kbytes of user data can be transmitted.
The Ethernet CP acts as an “S7 communication relay” by passing on the S7
functions via Industrial Ethernet. Depending on the configuration of the Ethernet
CP, data transfer is on the basis of the ISO transport or the ISO-on-TCP protocol
(TCP/IP with RFC 1006).
From the perspective of the user, S7 communication is identical over PROFIBUS
and Industrial Ethernet.
Nodes
Two situations can occur depending on device type and plant configuration:
 Client and server functionality at both ends
S7 connections can be operated between the following nodes with the entire
functionality of S7 communication:
- between S7 stations S7-300 and S7-400;
- between S7 stations and PC/PG stations with an Ethernet CP.
Ethernet
PC/PG with Ethernet CP
S7 - 400
S7 - 300
Ethernet CP
M7
* only TCP/IP
S7 - 300 / 400
Ethernet CP
PUT / GET
BSEND / BRECV
USEND / URECV
WAN *
Figure 1-3 Nodes Communicating on S7 Connections over Industrial Ethernet

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)