Siemens SIMATIC NET System Manual

Basics of communication with Industrial Ethernet
1.3 Technologies of Industrial Ethernet
Industrial Ethernet
System Manual, 09/2019, C79000-G8976-C242-10
27
User-Network Interface
A deterministic data transfer between two devices can only work if the communication
requirements of the devices match the resources available in the network. A suitable
transmission path must be made available for time-critical OPC UA data. The User Network
Interface (UNI) automatically takes on this decentralized coordination task. The special
advantage for users is that a system is not required for the central configuration.
1.3 Technologies of Industrial Ethernet
1.3.1 Communications media
Selection of media
Industrial Ethernet provides you with three different technologies to solve your automation
task:
● Electrical cabling
● Optical cabling
● Wireless/radio
Guide to selection
The following table shows with of the three communications media is best suited to which
requirements:
Twisted pair network
Fiber-optic network
Wireless linking
Suitability for high transmis-
sion rates
● *
1)
*
Inter-building networking -- ● *
EMC
*
●
●
Simple cable installation
●
*
--
Range of cables for special
use cases
• Cables for indoors and
outdoors according to the
cable characteristics
• Trailing cable
• Cable free of halogens
• Ship cable
• FastConnect cables
• Cables for indoors and
outdoors
• Trailing cable
• Cable free of halogens
--
The effect of failure of a
network section
In a ring, no effect. In simple
structures, the network
breaks down into two isolat-
ed subnetworks
In a ring, no effect. In simple
structures, the network
breaks down into two isolat-
ed subnetworks
If there are overlapping wire-
less cells, the client roams to
another AP

Siemens SIMATIC NET Specifications

General

Category	Industrial Communication Software
Manufacturer	Siemens
Operating Systems	Windows, Linux
Protocols Supported	PROFIBUS, PROFINET, OPC UA
Compatibility	Siemens PLCs, Third-party devices with supported protocols