Siemens SIMATIC NET S7-300 User Manual

1 Communication via Ethernet CPs in S7 Stations
A-30
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
Notes on S7 Communication between PC/PG Station and S7 Station
Applications in a PC/PG station communicate with the S7 station over an OPC
interface or SAPI-S7 interface for operator intervention, monitoring and control.
The S7 stations use the integrated communication SFBs/FBs (client and server
functionality at both ends).
The following general requirements must be met by a PC/PG station for S7
communication:
 The following are installed in the PC/PG:
- an Ethernet CP
- there is an interface for S7 communication installed: SOFTNET S7 for Ind.
Ethernet or software from the SIMATIC NET CD.
 The CPs in the S7 stations are supplied with a MAC/IP address (use the default
MAC address or set an IP address).
 The CPs in the S7 stations are supplied with a MAC/IP address (use the default
MAC address or set an IP address).
To use S7 communication with the SIMATIC S7 PLC from a PC, address the
required CPU module in the SIMATIC S7 PLC that you want to communicate with
in your PC application.
S7 Communication via Routers (one-sided Client and Server Functionality)
It is possible to reach the S7 station from an application (OPC server) of the
PC/PG station that is attached to another subnet. The subnets must be connected
over a router such as the IE/PB Link. An S7 station or a PC connected to both
subnets can also serve as a router.
In this configuration, the S7 station can only be addressed by the PC/PG station as
a communications server on S7 connections configured at one end.
The requirements for the configuration of the PC/PG station are identical to those
for operation in the same subnet (see above); the CP in the PC/PG station must
also have routing capability.
In this situation, configure a one-ended S7 connection to the PC/PG station in the
other subnet for the PC/PG station in STEP 7 NetPro. You can then access data in
the S7 station in your user program using the functions PUT (writing) and GET
(reading).

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)