Siemens SIMATIC ET 200AL, System Manual

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Glossary
PROFINET with STEP 7
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Function Manual, 05/2021, A5E03444486-AL
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.
Proxy
The PROFINET device with proxy functionality is the substitute for a PROFIBUS device on
Ethernet. The proxy functionality allows a PROFIBUS device to communicate not only with its
master but also with all devices on PROFINET.
With PROFINET, existing PROFIBUS systems can be integrated into the PROFINET
communication with the aid of an IE/PB link, for example. The IE/PB Link PN IO then handles
communication via PROFINET on behalf of the PROFIBUS components.
In this way, you can link both DPV0 and DPV1 slaves to PROFINET.
Real-time
Real-time means that a system processes external events within a defined time.
Real-time communication
Group error for RT and IRT.
PROFINET uses its own real-time channel (RT) rather than TCP/IP for communication of time-
critical IO user data.
Redundant systems
Redundant systems are characterized by the fact that important automation components are
present multiple times (redundantly). Process control is maintained if a redundant
component fails.
Router
A router interconnects two subnets. A router works in a similar way to a switch. With a router,
however, you can also specify which communication devices may communicate via the
router and which may not. The communication devices on various sides of a router can only
communicate with one another if you have explicitly enabled communication between these
devices via the router. Real-time data cannot be exchanged beyond subnet boundaries.
RT
PROFINET IO with R eal T ime communication (RT) is the optimal transmission method for
time-critical applications in factory automation. PROFINET IO frames are prioritized over
standard frames in accordance with IEEE802.1Q. This ensures the required determinism in
the automation technology.