Manual VIPA System 300S SPEED7 Chapter 4 Deployment CPU 313SC/DPM
HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45 4-19
The RS485 interfaces may be set to PtP- (point to point) or Profibus DP
master communication respectively the behavior of synchronization
between DP master system and CPU may be set:
Deactivated Deactivates the RS485 interface
PtP With this operating mode the Profibus DP master
is deactivated and the RS485 interface acts as an
interface for serial point to point communication.
Here data may be exchanged between two
stations by means of protocols.
More about this may be found at chapter
"Deployment RS485 for PtP communication" in
this manual.
Profibus-DP async
Profibus DP master operation asynchronous to
CPU cycle.
Here CPU cycle and cycles of every bus DP
master run independently.
Profibus-DP syncIn CPU is waiting for DP master input data.
Profbus-DP syncOut
DP master system is waiting for CPU output
data.
Profibus-DP syncInOut
CPU and DP master system are waiting on each
other and form thereby a cycle.
Normally the cycle 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 SPEED-Bus Profibus DP
master and the SPEED7 CPU can be configured by means of a hardware
configuration as shown above.
The different modes for the synchronization are in the following described.
Function
RS485 X3
Synchronization
between master
system and CPU
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