Siemens Simatic S7-300 CPU 31xC Series User Manual

Configuring
4.11 Planning subnets
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
4-43
Example: Installation of a PROFIBUS subnet
The figure below shows you the basic principles of a PROFIBUS subnet installation.
S5-95U
PG
1
3
S7-300
CPU
PS
CPU
31x-2 DP
MASTER
MPI-addr. 0
MPI-addr. 3
PROFIBUS
addr. 2
PROFIBUS
addr. 3
PROFIBUS
addr. 4
PROFIBUS
addr. 5
PROFIBUS
addr. 6
PROFIBUS
addr. 7
3
CPU
PS
ET 200M
CPU
PS
ET 200M
CPU
PS
ET 200 M
3
S7-300
CPU
PS
DP-CPU
CPU
PS
ET 200M
CPU
PS
ET 200M
CPU
ET 200B ET 200B
CPU
ET 200B
CPU
ET 200B
PROFIBUS
addr. 12
PROFIBUS
addr. 11
PROFIBUS
addr. 10
PROFIBUS
addr. 9
PROFIBUS
addr. 8
1
1
2
Key to numbers in the figure
(1) Terminating resistor enabled.
(2) PG connected by means of a stub cable for maintenance purposes

Siemens Simatic S7-300 CPU 31xC Series Specifications

General

Series	S7-300 CPU 31xC
Power Supply	24 V DC
Communication Interfaces	MPI, PROFIBUS DP
Programming Languages	LAD, STL, FBD, SCL
Operating Temperature	0°C to +60°C
Memory	48 KB - 512 KB
Dimensions	40 x 125 x 130 mm (varies by model)