Siemens SINUMERIK 840Di Manual page 241

06.03
DP cycle
T
DP
Master application
cycle T
MAPC
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
On tab card "Clock synchronization" the following parameters are now set for
each type of DP slave:
S
Equidistant DP cycle T
S
Master application cycle T
S
Actual-value sensing T
S
Setpoint acceptance T
DP slave properties
General Configuration Clock synchronization
Synchronize drive to equidistant DP cycle
Network settings in msec:
Equidistant bus cycle activated
Equidistant DP cycle:
2.000
Master application cycle
2.000
[msec]:
DP cycle [msec]:
2.000
Actual-value sensing [msec]: 0.125
Setpoint acceptance [msec]:
1.500
Adjust
OK
Fig. 7-11 Dialog: DP slave properties
The DP cycle time of the DP slave 611U must be set to the cycle time of the DP
master displayed under "equidistant DP cycle".
Notice
For DP cycle time T the following condition must be fulfilled:
DP
DP cycle = isosynch. DP cycle
The parameter: Master Application Cycle T
tween the master application (NC position controller) and the equidistant DP
cycle.
Using ratios other then 1:1, the dead times of the position controller can be re-
duced if NC hardware of the lower performance range is used.
7 PROFIBUS DP Communication
7.3 SIMATIC S7 project
DP
MAPC
I
O.
Cyclic portion of equidistant master
Factor
= 1 x
Factor
x
= 16
Factor
x
= 1
Factor
x
= 12
defines the integer ration be-
MAPC
1.258
Basic time [msec]
2.000
Basic time [msec]
0.125
Basic time [msec]
0.125
Basic time [msec]
0.125
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