ProfiNET Realtime Master

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SYBERA offers a ProfiNET Master for ProfiNET devices. This master library allows the RT control of ProfiNET IO devices. Based on the increasing requirements of networking within the industrial area, the ethernet communication plays a more and more important role for the control of devices. Different ethernet standards are available for the bus related communication, like SERCOS, Powerlink, EtherCAT and PROFINET. The communication principle rested characteristically on a deterministic process data-exchange and requires therefore for control and devices deterministic Soft- and hardware.

The direct control of the field bus devices with a PC and the operating system windows became relevant with the introduction of so-called realtime extensions.  An example therefor is the realtime extension of SYBERA that enables ethernet update cycles upto 50 µsec. The Ethernet based bus-communication differs not only through a different protocol-specification, but rather also through the bus-topology. While EtherCAT realizes a ring-topology, PROFINET realizes a star topology.  While EtherCAT enables the typical Master/Slave-principle between control and devices, PROFINET consists of a provider/Consumer-model, which allows changing roles.  The PROFINET realtime communication prefaces a defined Master/Slave-relation. Similar to the EtherCAT master, SYBERA calls the new PROFINET stack a PROFINET master. With the new realtime PROFINET master the necessity of a separate controller-hardware falls. The PROFINET control can be realized simply by the PC by standard Ethernet adapters. The PROFINET master is offered as an open realtime library system and enables the developer for programming of a deterministic control applications  for PROFINET devices.

The SYBERA ProfiNET Master library allows the RT control of ProfiNET IO devices. The Open Master Library is based on the Ethernet Realtime Core. SYBERA provides therefore a library called SHAPNIOCORE for mastering the ProfinetIO states and sending and receiving of ProfinetIO frames in realtime. The Open ProfinetIO Realtime library allows handling of ProfinetIO data in realtime, without the need of an complex ProfinetIO management, nevertheless with the ability of interfacing all ProfinetIO interface levels.

The ProfinetIO Library is based on 4 Realtime Tasks, for sending (TX) and receiving (RX) of ProfinetIO frames, error handling and the realtime application task. The tasks are syncronized by an internal state machine. Thereby the error task recognizes framing errors and hardware latencies.

A ProfinetIO fieldbus system consists of several station devices (typically buscoupler devices). A station consists at least of one module (SLOT) and a module consists at least of one submodule (SUBSLOT). For proper operation the ProfinetIO devices needs first to be configured and a STATIONLIST must be created. Therefore SYBERA provides a program called STATIONGEN. STATIONGEN allows creating a stationlist by selecting modules from a module catalog. The catalog get its entries by the provides GSDML files. A module is inserted to the station list configuration.

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