Acknowledgment; Time-Of-Day Synchronization - Siemens CP 1243-8 IRC Operating Instructions Manual

4.4

Acknowledgment

Acknowledgment of frames
The receipt of a sent frame is monitored and acknowledged in different ways. The
mechanisms differ depending on the type of communication:
● Telecontrol communication
Frames sent by the master station are acknowledged immediately by the CP when
received.
Frames sent by the CP are acknowledged by the master station.
– Inter-station communication
● Open User Communication
The successful sending and receipt of frames is indicated by status displays of the
program blocks.
With TCP segments, the protocol-specific acknowledgement mechanisms are used.
4.5

Time-of-day synchronization

Time-of-day synchronization
With applications that require time-of-day synchronization (e.g. telecontrol), you need to
synchronize the time of day of the CP regularly. If you do not synchronize the time of day of
the CP regularly, there may be deviations of several seconds per day in the time information
of the CP.
Configuring time-of-day synchronization
Configuration in STEP 7 V5
If you configure the time-of-day synchronization for the proxy in STEP 7 V5, this information
is adopted when you import the configuration data in STEP 7 Basic.
CP 1243-8 IRC
Operating Instructions, 06/2015, C79000-G8976-C385-01
Received frames are acknowledged immediately by the CP. The acknowledgement
frame is forwarded by the master station to the sending CP.
Configuration and operation
4.4 Acknowledgment
47