Technical data

Configuring time synchronization
5.5 Configuring the time synchronization of the OS
Time synchronization (V7.1)
86 Function Manual, 03/2009, A5E01216578-01
Configuring the OS server for time synchronization
In this configuration, use the NTP time server as the time source instead of a central plant
clock. The NTP time server is a reliable time source with the DCF 77 reception module or
GPS receiver module. Time master is the domain controller. The parameter assignment of
the domain controller as time master is described in the Microsoft literature at the Internet
address: (
http://support.microsoft.com/kb/816042/en-us) .
To assign parameters for the OS server additionally as time slaves of the domain controllers,
proceed as follows:
1. Open the OS server in the PCS 7 project on the engineering station.
2. Select the "Time synchronization" editor from the tree view of WinCC Explorer.
3. Select Open from the shortcut menu.
The "Time Synchronization" dialog box opens.
4. Select the "Synchronization via terminal bus (slave)" check box.
5. Activate the "Accept time from permanently defined computers" check box and select for
"Computer 1" the domain controller that is parameterized as the time master.
6. For "Computer 2", select an additional domain controller to act as a passive time master if
redundancy is possible.
7. Select the "Synchronization via plant bus (master, slave)" check box.