01/2007
8.3 Creating a PROFIBUS configuration
8-188
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
Note
You are advised not
to activate the option ”Times Ti and To same for all slaves”
in the ”Synchronization of the slaves” group.
On tab card ”Clock synchronization” the following parameters are now set for
each type of DP slave:
– Equidistant DP cycle T
DP
– Master application cycle T
MAPC
– Actual value acquisition Ti
– Setpoint transfer T
o
.
Factor
General
Isochronous bus cycle activated
Network settings in ms
Synchronize drive to equidistant DP cycle
Cycle synchronizationConfiguration
Cyclic portion of isochronous master
Increment/base time [ms]
2.000
Isochronous DP cycle:
1.258
2.000
2.000 2.000
0.125
0.125
0.12512
1
16
1
1.500
0.125
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OK
Comparison
DP slave properties
Factor
Factor
Factor
Increment/base time [ms]
Increment/base time [ms]
Increment/base time [ms]
=
=
=
=
x
x
x
x
Time To [ms]
(setpoint acceptance):
Time Ti [ms]
(actual value acquisition):
Master application
cycle [ms]:
DP cycle [msec]:
Fig. 8-9 Dialog box: DP slave properties
The ”DP cycle” of DP slave S120 must be set to the cycle time of the DP master
displayed under >”Isochronous DP cycle” in group box ”Network settings in ms”.
Notice
For DP cycle time T
DP
the following condition must be fulfilled:
DP cycle = isochron. DP cycle
DP cycle
T
DP
8 PROFIBUS DP Communication
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