PROFIBUS DP syncInOut
CPU and DP master system are waiting on
each other and form thereby a cycle.
Default: PROFIBUS DP async
5.9.2.1.1 Synchronization between master system and CPU
Normally the cycles of CPU and DP master run independently. The cycle time of the CPU
is the time needed for one OB1 cycle and for reading respectively writing the inputs
respectively outputs. The cycle time of a DP master depends among others on the
number of connected slaves and the baud rate, thus every plugged DP master has its
own cycle time. Due to the asynchronism of CPU and DP master the whole system gets
relatively high response times. The synchronization behavior between every VIPA
PROFIBUS DP master and the CPU may be configured by means of a hardware configu-
ration as shown above. The different modes for the synchronization are in the following
described.
In PROFIBUS DP SyncInOut mode CPU and DP master system are waiting on each
other and form thereby a cycle. Here the whole cycle is the sum of the longest DP master
cycle and CPU cycle. By this synchronization mode you receive global consistent in-/
output data, since within the total cycle the same input and output data are handled suc-
cessively by CPU and DP master system. If necessary the time of the Watchdog of the
bus parameters should be increased at this mode.
In this operating mode the cycle time of the VIPA DP master system depends on the CPU
cycle time. After CPU start-up the DP master gets synchronized. As soon as their cycle is
passed they wait for the next synchronization impulse with output data of the CPU. So the
response time of your system can be improved because output data were directly trans-
mitted to the DP master system. If necessary the time of the Watchdog of the bus param-
eters should be increased at this mode.
Overview
PROFIBUS DP SyncInOut
PROFIBUS DP SyncOut
VIPA System 300S
+
Deployment CPU 314-6CF23
Setting VIPA specific CPU parameters > VIPA specific parameters
HB140 | CPU | 314-6CF23 | en | 19-01
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