Siemens SIMATIC ET 200AL - Page 939

Glossary
Communication
Function Manual, 12/2017, A5E03735815-AF
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PROFINET IO
IO stands for input/output; distributed I/O (fast, cyclic data exchange with real-time
capability). From the perspective of the user program, the distributed I/O is addressed in
exactly the same way as the centralized IO.
PROFINET IO as the Ethernet-based automation standard of PROFIBUS & PROFINET
International defines a cross-vendor communication, automation, and engineering model.
With PROFINET IO, a switching technology is used that allows all devices to access the
network at any time. In this way, the network can be used much more efficiently through the
simultaneous data transfer of several devices. Simultaneous sending and receiving is
enabled via the full-duplex operation of Switched Ethernet.
PROFINET IO is based on switched Ethernet with full-duplex operation and a bandwidth of
100 Mbps.
Programming device
Programming devices are essentially compact and portable PCs which are suitable for
industrial applications. They are identified by a special hardware and software configuration
for programmable logic controllers.
Protocol
Agreement on the rules by which the communication between two or more communication
partners transpires.
PtP
P
oint-
t
o-
P
oint, interface and/or transmission protocol for bidirectional data exchange
between two (and only two) communications partners.
Ring topology
All devices of a network are connected together in a ring.
Root CA certificates
→ See also root certificate