Route Control Server; Reaction Of Route Control Servers To Failure - Siemens SIMATIC PCS 7 Function Manual

Failure, Switchover and Return of Fault-tolerant Components

6.6 Route Control server

6.6 Route Control server
6.6.1

Reaction of Route Control servers to failure

Functionality
Route Control applications and any configured WinCC applications are active on Route Control
servers. A Route Control client visualizes the route list of the Route Control server to which it
is interconnected.
Failure of the master Route Control server
If the master Route Control server fails, for example, due to failure of the operating system or
failure in an application, the standby Route Control server recognizes that the master is no
longer available based on redundancy mechanisms and takes over the role of master. The
new master automatically assumes all control functions of the running route control program,
even of routes already requested. The visualization continues, since the Route Control clients
automatically switch to the new master.
The status is synchronized between the active Route Control server and the AS. If
communication errors occurred, the Route Control program can only be continued manually.
Note
Data reliability
During the failover from the failed Route Control server to its redundant Route Control server,
no data from the automation process is visualized on a Route Control client. Operator inputs
during this failover time are neither accepted nor executed.
Operation of a route via a Route Control faceplate from a PCS 7 OS is possible during
redundancy failover of a Route Control server, if there is a communications connection
between PCS 7 OS and the automation system.
Activating process mode of Route Control servers
Note
Please note that you need to activate process mode for redundant Route control servers one
after the other. One of the two Route Control servers will take on the property of Master server,
depending on the configuration.
PC station identified as faulty
Additional information on this is available in the section "Failure, failover and restarting of
redundant OS servers (Page 196)".
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Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA