Siemens Simatic S7-300 CPU 31xC Series User Manual

Configuring
4.11 Planning subnets
S7-300, CPU 31xC and CPU 31x: Installation
4-58 Operating Instructions, Edition 08/2004, A5E00105492-05
Installation guidelines
PROFINET allows you to set up a high-performance and continuous communication system.
You can further increase performance by using the following installation guidelines.
• Interconnect a router between the office network and the PROFINET system. Use the
router to define access privileges for your PROFINET system.
• Set up your PROFINET in a star architecture where this is useful (for example: in a switch
cabinet).
• Keep the number of switches low. This increases clarity of your PROFINET system
architecture.
• Connect your programming device (PG) close to the communication partner (for example:
connect the PG and the communication partner to the same switch).
• Modules with PROFINET interfaces may only be operated in LANs where all nodes are
equipped with SELV/PELV power supplies or protection systems of equal quality.
• A data transfer device that ensures this safety must be specified for the coupling to the
WAN.
Reference
For detailed information on Industrial Ethernet networks or network components, refer to:
• the Internet URL http://www.siemens.com/automation/service&support.
• The STEP 7 Online Help. There you can also find further information on IP address
assignment.
• The Communication with SIMATIC (EWA 4NEB 710 6075-01) manual
• The SIMATIC NET manual: Twisted-Pair and Fiber Optic Networks
(6GK1970-1BA10-0AA0)

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)