Siemens SIMATIC HMI Series System Manual page 66

WinCC Release Notes
2.2 Notes on operation
Information for using routers and firewalls
Using routers
WinCC V7 can also be used to connect WinCC clients to WinCC servers via routers.
WinCC clients without their own project cannot be used for configuration with the routers, only
for WinCC Runtime. There are no restrictions for WinCC clients with their own project.
The following is required when using routers:
● WinCC must use the correct IP address of the WinCC stations.
● The WinCC stations must be capable of resolving the physical computer name (NETBIOS
name) of the other computers in the WinCC project.
● The WinCC stations must be capable of reaching each other via TCP/IP and ICMP without
any problems. When testing the connection using Ping, it must be possible to access the
computers immediately.
● Activate multicast forwarding to the network routers between the servers and the clients.
Speed of the network connections
For slow network connections, we recommend:
● Restricting the quantity of data to be transferred, for example, by avoiding complicated
graphics.
● Using the local pdl cache of the WinCC client.
● Using the ISDN router for a WinCC client in multi-link mode (channel bundling). Bandwidths
below 128 Kbps have proved insufficient.
● Integrate only one WinCC client for each additional ISDN channel.
● The operation of WinCC via ISDN routers depends on the stability and availability of the
ISDN network.
● Reserve the maximum bandwidth of the connection for WinCC.
Note
Connection via ISDN and operation using slow connections has not been approved for
clients without a local project.
Connecting to an office network with a central firewall
Some network configurations can increase the load on the firewall.
You can avoid the described reaction by assigning unique IP addresses to all WinCC stations.
Basic system characteristics
● With a standard installation of Windows, the computer is assigned a random IP address
from the DHCP server.
66
WinCC: General information and installation
System Manual, 02/2017, A5E40840020-AA