High-performance measurement technology in PROFINET environment
The scalable and highly flexible peripheral system SIMATIC ET 200 is known from automation and serves to connect process signals to a higher-level controller.
With the “High Speed” (HS) peripheral modules, process values can be captured and output extremely quickly. With the SIMATIC ET 200 peripheral system, this allows a realization of metrological applications in conjunction with a SIMATIC controller, e.g. for in-line testing.
The “High Speed” peripheral modules not only support very small send clocks, but are also able to quickly capture and buffer measured values in time equidistant sub clocks.
The buffered measured values are sent as data packages to the controller during each send clock. This functionality is called Oversampling . The advantage is that with an inexpensive SIMATIC controller (e.g. S7-1515), measured values (max. 16 measured values per 0.750ms) can be efficiently captured or output.
The following figure shows the components used for the oversampling function.
The following application example shows the realization of high-performance analogue recording of measured values with a CPU 1515-2 PN with an ET 200SP peripheral system.