POSITAL Absolute encoder

PROFINET Technology PROFINET is an Industrial Ethernet standard merging plant automation with other enterprise IT resources. It provides comparable functionality to PROFIBUS. Established IT standards are employed as basis of communication: TCP, UDP, and IP. XML is used as description language for device profiles (GSDML files). Two ways of using PROFINET are available: PROFINET IO, similar to PROFIBUS DP as a distributed I/O system and PROFINET CBA as a modular component based system for larger systems. PROFINET offers scalable communication for different applications in industrial automation: PROFINET NRT (non real time) is suited for non-time-critical process automation with clock rates of roughly 100 msec. PROFINET RT (real time) offers a communication channel with optimized performance (10 msec clock rate) for most factory automation tasks PROFINET IRT (isochronous real time) employs special communication hardware to enable clock rates of less than 1 msec and a jitter precision of less than 1 μsec. This channel is mainly of use for motion control applications. PROFINET IO uses a view of distributed I/O similar to PROFIBUS DP. IO controllers (e.g. PLCs) run an automation program, IO devices (e.g. absolute encoders) are remotely assigned field devices, and IO supervisors (e.g. programming devices) are used for commissioning and diagnostics. The engineering of PROFINET IO is done similar to PROFIBUS. The field buses (i.e. Ethernet topologies) are assigned to control systems during configuration. The IO device is configured in the actual system based on the contents of its GSDML file. After completion of the engineering the installer loads the data for the expansion into the IO controller (PLC) and the IO controller assumes data exchange with the IO device. An IO device is addressed within PROFINET (and also possibly by external IT components) through its IP address. Data can be exchanged from the IO controller to the IO device (and vice versa) cyclically (for process data). Apart from this, parameter data can be exchanged acyclically during engineering of the IO device or by the use of PLC programming blocks.

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