Siemens SIMATIC NET S7-300 User Manual

5 Configuring Communication Connections
A-154
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
5.8 FETCH/WRITE Mode
FETCH/WRITE
The FETCH/WRITE services allow direct access to the system memory areas on
the SIMATIC S7 CPU from SIMATIC S5, SIMATIC PC stations, or from devices of
other ranges.
 FETCH: Read data directly
 WRITE: Write data directly
Connection Types
The FETCH/WRITE services can be configured and used in SIMATIC S7 on the
following connection types:
 ISO transport connections
 ISO-on-TCP connections
 TCP connections
Configuration
Depending on the station type, the following modes can be configured for the
connection endpoint:
 SIMATIC S7 Station: FETCH PASSIVE / WRITE PASSIVE
If you select the FETCH PASSIVE or WRITE PASSIVE mode for the ISO
transport connection, you can access the system areas on a SIMATIC S7 PLC
from a SIMATIC S5 station or other non-S7 station (unspecified 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)