Siemens SIMOVERT MASTERDRIVES Manual page 372

05.2006
Auxiliary conditions
Comparison
PROFIBUS /
SIMOLINK
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
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
Medium
Distance
Max number of nodes
Number of slaves/cycle
Max. telegram length
Compendium Motion Control
PROFIBUS
Copper
100 m (12 Mbit/s)
31 (no repeater)
11 / 3.2 ms; 27 / 6.4 ms
16 words
Communication / PROFIBUS
SIMOLINK
Glass / plastic
Glass: 300 m
Plastic: 40 m per node
200
100 per ms / < 1 ms
n times 2 words
8.2-85