09.2008 Communication / PROFIBUS
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES Compendium Motion Control 8.2-85
Two time conditions which have to be complied with are
♦ "DP cycle" > "Equidistance master cyclical part" + 1000 µs
♦ "DP cycle" > "Equidistance master cyclical part" + "Equidistance
master acyclical part"" + "Master class 2"
The following auxiliary conditions are to be complied with at the present
time when clock synchronization at the isochronous PROFIBUS is used:
♦ Transfer rate: 12 Mbit/s (the performance of lower transfer rates is too
small for drives)
♦ Maximum number of nodes: 31
♦ Maximum distance: 100 m
♦ Only one master class 1 (the equidistance master)
♦ A maximum of one additional master (class 2, PG); it is recommended
that no additional master be used
♦ No repeater, no fiber optic cables (they cause different dead times)
♦ The CBP2 must be directly plugged onto the basic board (also via
adapter board). There must not be a technology board plugged in
between the basic unit and the CBP2
PROFIBUS offers you a bus system for all tasks. With SIMOLINK, you
can achieve better performance in clock synchronization. The following
table shows the differences in clock synchronization:
Criterion PROFIBUS SIMOLINK
Medium Copper Glass / plastic
Distance 100 m (12 Mbit/s)
Glass: 300 m
Plastic: 40 m per node
Max number of nodes 31 (no repeater) 200
Number of slaves/cycle 11 / 3.2 ms; 27 / 6.4 ms 100 per ms / < 1 ms
Max. telegram length 16 words n times 2 words
Auxiliary conditions
Comparison
PROFIBUS /
SIMOLINK
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