Design Engineering

Compact encoders for Profinet IO networks PI-certified


General DPN

Posital announces that their Optocode rotary encoders with Profinet IO interfaces are now certified for IRT data transfer protocols. The certificate was issued by Profibus/Profinet International, the organization responsible for the Profinet protocol suite. The encoders also support RT and NRT  data transfers.

“Optocode encoders connected to Pronfinet IO networks with IRT can provide extremely fast response, with cycle times as low as one millisecond” reports Christian Fell, General Manager of Posital. “This combination can be used for the most critical motion control and industrial automation applications.”



Setup of these devices is straightforward: unit parameters are set via the control system with the use of a GSDML device file to enables easy configuration while a bootloader enables the installation of firmware updates via FTP. Existing Profibus systems can be easily migrated to the Profinet IO, since the device profile management has been retained. An integrated switch automatically recognizes crossover or standard Ethernet cable connections. The physical characteristics of these devices also make them easy to work with. The encoders are compact (only 58 mm in diameter) and don’t require a connection cap, terminating resistors or switches for address allocation. Like all Optocode encoders, the Profinet IO models use a proven opto-electronic scanning method that provides a resolution of 16 bits per revolution. Multi-turn versions can register up to 16,384 revolutions (214), for a total measuring range of 30 bits. Optocode encoders operate without backup batteries and instantly report current absolute position values, even after startup or power failure. They are available with special casings for demanding environments such the food or pharmaceutical industries, explosive atmospheres and mining applications.


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