09.2008 Communication / PROFIBUS
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES Compendium Motion Control 8.2-89
General
♦ Output data:
Data which a slave receives cyclically from the master and forwards
to the slave application or the I/O's.
♦ Input data:
Data sent cyclically to the master by a slave.
♦ Process data:
For drives, all input and output data
♦ Technological functions:
Controls and sequence control for automation of application-specific
processes
Clock synchronization
♦ Synchronization:
Creating synchronism (simultaneity, time consistency)
♦ Clock synchronization:
Clock synchronization refers to the synchronization of the sample
times of the control with the connected drives.
♦ Clock synchronous application:
in the control software in digital drives and control system. The
starting times and the length of the sampling times in various devices
are synchronized exactly with each other.
♦ Equidistance:
The same distance. The bus cycle time is always constant. Any free
bus time is filled up with blank telegrams.
♦ Isochronous mode:
Profibus service for clock synchronization; produces a time-constant,
i.e. equidistant bus cycle with a clock pulse signal at the start of the
cycle.
Definitions
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