Communications
configuring
System- and communication configuring D7-SYS - SIMADYN D
3-173
Edition 12.2003
When configuring the system, it should be noted that the number of
nodes is restricted by the following factors:
•
Pulse frequency set in MASTERDRIVES MC
The sampling time for the time sector to be synchronized is obtained
from this pulse frequency (parameter number P340).
•
Data quantity to be transferred
The number of telegrams which are to be sent along the SIMOLINK
ring between the SL master and the slaves.
The following formula applies:
P745
1
2
µs
6.36
µs
3.18181
P746
N
∗
−
+
=
•
with P746=bus cycle time (this depends on the pulse frequency and the
time sector to be synchronized)
•
with P745=number of channels
•
with 6.36
µ
s=telegram run time
When the MASTERDRIVES MC pulse frequency is set to 5 kHz, for
example, the following values are determined:
No. of nodes
No. of channels
0.8 ms (T2)
1.6 ms (T3)
3.2 ms (T4)
1 124 201 201
2 62 124 201
3 41 83 167
4 31 62 125
5 24 49 100
6 20 41 83
7 17 35 71
8 15 31 62
Table 3-64
Node table for various bus cycle times (drive converter/inverter time sectors
in brackets)
Number of nodes
Node tables
