Siemens SIMATIC ET 200AL, System Manual

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Description
2.1 Introduction to PROFINET
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
2.1.3 PROFINET interface
Overview
PROFINET devices of the SIMATIC product family have one or more PROFINET interfaces
(Ethernet controller/interface). The PROFINET interfaces have one or more ports (physical
connection options).
In the case of PROFINET interfaces with multiple ports, the devices have an integrated switch.
PROFINET devices with two ports on one interface allow you to configure the system in a line
or ring topology. PROFINET devices with three or more ports on one interface are also ideal
for setting up tree topologies.
Properties and rules for naming the PROFINET interface and its representation in STEP 7 are
explained in the following.
Properties
Every PROFINET device on the network is uniquely identified via its PROFINET interface. For
this purpose, each PROFINET interface has:
•
A MAC address (factory default)
• An IP address
• A PROFINET device name
Identification and numbering of the interfaces and ports
Interfaces and ports for all modules and devices in the PROFINET system are identified with
the following characters:
Table 2- 3 Identification for interfaces and ports of PROFINET devices
Element Symbol Interface number
Interface X In ascending order starting from
number 1
Port P In ascending order starting from
number 1
(for each interface)
Ring port R
Examples of identification
Three examples illustrate the rules for identifying PROFINET interfaces:
Table 2- 4 Examples for identifying PROFINET interfaces
Sample labeling Interface number Port number
X2 P1 2 1
X1 P2 1 2
X1 P1 R 1 1 (ring port)