Siemens SIMATIC HMI series System Manual

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.
Migration
5.9 Upgrading a Redundant System in Normal Operation
WinCC: General information and installation
160 System Manual, 02/2017, A5E40840020-AA

Siemens SIMATIC HMI series Specifications

General

Series	SIMATIC HMI
Category	Control Panel
Display Type	TFT LCD
Touch Screen	Yes (resistive or capacitive, depending on model)
Processor	Varies by model (e.g., ARM-based processors)
Storage	Varies by model (e.g., Flash memory, microSD card slot)
Communication Interfaces	Ethernet, USB
Protection Class	IP65 (front panel), depending on model
Operating Temperature	0 to 50°C, -20 to 60°C
Power Supply	24 V DC
Memory	128 MB, 256 MB