Glossary term
PROFINET
protocoleBasics
Also known as
PROFINET IOPROFINET IRT
Definition
Industrial real-time Ethernet standard defined by PI (PROFIBUS & PROFINET International) and standardised as IEC 61158/IEC 61784. Three performance classes: NRT, RT and IRT (cycle < 1 ms). Replaces PROFIBUS on new installations.
Questions using this term
- A GSDML file (Generic Station Description Markup Language) is provided by the manufacturer of a PROFINET IO Device and is imported into the engineering tool (e.g. TIA Portal) to integrate the device into the project.1. Architecture · GSDML
- PROFINET defines three device roles: IO Controller (equivalent to the PLC master), IO Device (equivalent to a slave: sensor, actuator) and IO Supervisor (engineering PC used for diagnostics and configuration).1. Architecture · Device-Rollen-Modell
- The PROFINET Update Time of an IO Device is configurable individually depending on the application: typical values range from 1 to 128 ms in RT, and down to 250 us in IRT.2. Real-time classes · Update Time
- PROFINET supports several physical topologies: star (via switches), line (daisy-chain through ports integrated in the devices) and ring (with MRP for redundancy), and they may be combined within the same network.3. Topology & cabling · Unterstützte Topologien
- LLDP (Link Layer Discovery Protocol, IEEE 802.1AB) lets PROFINET devices identify each other and automatically discover the network topology, which is exploited by diagnostic tools such as PRONETA or the TIA Portal Topology Editor.4. Diagnostics · LLDP
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