Siemens SIMATIC HMI Series System Manual page 64

WinCC Release Notes
2.2 Notes on operation
Use of redundant servers
When redundant pairs of servers are implemented, the master and standby server must be
operated in the same IP/subnet band.
Network adapters with energy-saving mode
When using network adapters provided with energy-saving mode, the energy-saving mode
must not be activated.
Operation with multiple network adapters
If WinCC is used on a PC with more than one network adapter, observe the following:
Select the IP addresses which WinCC should use for communication with other WinCC
stations. In Windows Explorer, select the "Simatic Shell" directory. Click into the navigation
window of the dialog "Simatic Shell" and select "Settings..." in the shortcut menu. In the
"Settings" dialog that follows, select the IP address to be used.
If problems occur with the configuration and project management despite this setting, it could
be due to the assignment of the IP address by the DHCP server to the WinCC station being
too slow. In this case, the network administrator must define the IP address for each network
adapter on the WinCC station causing the problem.
To do this, press the Windows "Start" button and select "Settings" > "Control Panel". Open the
"Network Connections" folder and then the "LAN Connection" dialog. Click "Properties" in the
"General" tab. Open the "LAN Connection Properties" dialog and select the "Internet Protocol
(TCP/IP)" element from the list in the "General" tab by double-clicking it. Use the "Use the
following IP address" option button in the properties of Internet Protocol (TCP/IP) to define the
IP addresses.
Observe the information in the following chapter: "Special features for communication with a
server with multiple network adapters"
Network environment and network drives
Ensure that there are no unnecessary network drive connections.
In order to prevent delays following a restart of a distributed system, start the multi-user projects
first. The reason for this is the reaction of the master browser service (responsible for displaying
the network environment in the operating system) and administration of the domains and
working groups.
Operation with TCP/IP protocol
If the TCP/IP protocol is installed, the IP address must be valid and must not change in runtime
operation.
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WinCC: General information and installation
System Manual, 02/2017, A5E40840020-AA