Siemens SIMATIC NET S7-300 User Manual

E Linking to Other Systems with FETCH/WRITE
A-308
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
a) Structure of FETCH Frames
The meaning and values of parameters shown without values in the following table
can be found in the section “Parameter Values“.
FETCH request frame FETCH response frame
0
System ID
=”S” 0 System ID =”S”
1 =”5” 1 =”5”
2
Length of header
=16d. 2 Length of header =16d.
3
ID OP code
=01 3 ID OP code =01
4
Length OP code
=03 4 Length OP code =03
5
OP code
=05 5 OP code =06
6
ORG field
=03 6 Ack field =0Fh
7
Length ORG field
=08 7 Length ack field =03
8
ORG ID
8 Error field =No
9
DBNR
9 Empty field =FFh
A
Start address
High Byte A Length empty field =07
B Low Byte B
C
Length
High Byte C
D Low Byte D free
E
Empty field
=FFh. E
F
Length empty field
=02 F
Data up to 64 K but
only if Error no. =0

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)