SIEMENS 6DD-1681-0AF3
SM 338 operates in non-isochronous or isochronous mode, depending on systemparameters.In isochronous mode, data are exchanged between the DP master and SM 338 insynchronism to the PROFIBUS DP cycle.In isochronous mode, all 16 bytes of the feedback interface are consistent.If synchronism is lost due to disturbance or failure/delay of Global Control (GC), the SM 338
resumes isochronous mode at the next cycle without error reaction.If synchronism is lost, the feedback interface is not updated.
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SIEMENS 6DD-1681-0AF3
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