Phase 4: Defining Master Server And Completing Upgrade - Siemens SIMATIC HMI Series System Manual

Migration
5.9 Upgrading a Redundant System in Normal Operation
5.9.6

Phase 4: Defining Master Server and Completing Upgrade

Introduction
After upgrading the system, all WinCC clients, for which no preferred server has been
configured, are connected to the master server. As a result of the redundancy switching for
upgrading, the original master server, Server1, was set to standby server. The original standby
server, Server2, was set to master server.
In order to restore the original status, the master server must be reset manually. Follow the
instructions in step 25. This step concludes the upgrading procedure of your redundant system
to the new WinCC version.
Further information on preferred servers in redundant systems is available in the WinCC
Information System under the topic "Configurations > Redundant Systems".
Initial Situation Prior to Phase 4
● Server1 is the standby server.
● Server2 is the master server.
● WinCC Client1 is connected to its preferred server, Server1.
● WinCC Client2 is connected to its preferred server, Server2.
Procedure, Phase 4
For a detailed description of the procedure, click working step 25:
25. Switch master server manually
In order to restore the initial situation of the system, define Server1 as the master server
manually.
Set the redundancy tag "@RM_Master" on Server1 from 0 to 1. You can query and set the
redundancy tag "@RM_Master" via an I/O field, for example:
1. Configure an I/O field in the multi-user project from Server1.
2. Link the I/O field with the @RM_Master tag.
3. Enter a "1" in the I/O field in Runtime. Server1 becomes the master server. As a result of
the redundancy switching, Server2 becomes the standby server.
Alternatively, the redundancy tag can be set via scripts.
Result of Phase 4
● Server1 is the master server.
● Server2 is the standby server.
● WinCC Client1 is connected to its preferred server, Server1.
● WinCC Client2 is connected to its preferred server, Server2.
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WinCC: General information and installation
System Manual, 02/2017, A5E40840020-AA