Siemens SIMATIC ET 200AL, System Manual

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Glossary
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
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PROFINET device
A PROFINET device always has a PROFINET interface (electrical, optical, wireless). A lot of
devices also have a PROFIBUS DP interface to connect PROFIBUS devices.
PROFINET IO
Communication concept for the realization of modular, distributed applications within the
scope of PROFINET.
PROFINET IO is based on switched Ethernet with full-duplex operation and a bandwidth of
100 Mbps.
PROFINET IO Controller
Device used to address the connected IO devices. This means that the IO controller
exchanges input and output signals with assigned field devices. The IO controller is often the
controller on which the automation program runs.
PROFINET IO Device
A distributed field device that is assigned to one of the IO controllers (e.g. remote IO, valve
terminals, frequency converters, switches)
PROFINET IO System
PROFINET IO controller with assigned PROFINET IO devices.
PROFINET ring
Structure of a network. Common structures include:
•
Linear bus topology
• Ring topology
• Star topology
• Tree topology
Programmable logic controller
Programmable logic controllers (PLCs) are electronic controllers whose function is stored as a
program in the control unit. The structure and wiring of the device does not therefore
depend on the controller's function. A programmable logic controller is structured like a
computer. It consists of a CPU with memory, input/output modules and an internal bus
system. The IOs and the programming language are oriented to the requirements of the
control technology.