Example on a redundant distributed system

This chapter describes stepwise how to create a redundant distributed system in WinCC OA via the wizard. Before you have to think of the topology and of the connections between the sub systems. In this example the following structure is used for the whole system:

Figure: Topology for a redundant distributed system

How to create the three systems via the wizard is described and is divided into three parts (the single steps of creating the system are described). The redundant and distributed system specific settings are not described in detail since the settings were already described in the chapters Creating a redundant system and Create a distributed system.

Create the whole system (settings for the project1)

Execute the following steps to create the project1 with the settings shown above (System name "Sys1" with System number 1):

1. Open the wizard for creating a new project from the project administrator panel.

2. Choose the project type Redundant distributed project and click on Next >.

3. Enter general settings like project name (in this case "Project1"), languages, project directory and click on Next >.

4. Create the redundancy settings for the "Project1" like shown in the following figure.

Figure: Redundancy settings for Project1

1. Click on Next > and create the settings for a distributed system in the next panel. The following figure shows the settings for "Sys1".

Figure: Settings for Sys1

1. Since the system "Sys1" is the server in this example no further settings are necessary in the area Connected Systems.

2. Click on Next > and then on OK to create the project.

Create the whole system (settings for the project2)

Execute the following steps to create the project2 with the settings shown above (System name "Sys2" with System number 2):

1. Open the wizard for creating a new project from the project administrator panel.

2. Choose the project type Distributed project and click on Next >.

3. Enter general settings like project name (in this case "Project2"), languages, project directory,... and click on Next >.

4. Create the distributed settings for the "Project2. The following figure shows the settings for "Sys2".

Figure: Settings for Sys2

1. The system "Sys2" has a connection to "Sys1". The Sys1 is redundant (the check box Redundant has to be activated). Choose the both computers on which the redundant system "Sys1" is configured via the appropriate buttons. The button with the green checkmark applies the settings (the settings are added into the selection list of the Connected Systems).

2. Click on Next > and then OK to create the project.

Create the whole system (settings for the project3)

Execute the following steps to create the project3 (System name "Sys3" with System number 3)

1. Open the wizard for creating a new project from the project administrator panel.

2. Choose the project type Distributed project and click on Next >.

3. Enter general settings like project name (in this case "Project3"), languages, project directory,... and click on Next >.

4. Create the distributed settings for the "Project3". The following figure shows the settings for "Sys3".

Figure: Settings for Sys3

1. The system "Sys3" has a connection to "Sys1" which is redundant (the check box Redundant has to be activated). Choose the both computers on which the redundant system "Sys1" is configured via the appropriate buttons. Additionally the network from "Sys3" to "Sys1" is redundant (the check box Redundant net has to be activated). The button with the green checkmark applies the settings (the settings are added into the selection list of the Connected Systems ).

2. The "Sys3" has additionally a connection to "Sys2". The connection to this system is not redundant. Choose the host (in this case eiwrk160) and the specific system number (for "Sys2" this is the number 2) via the spin button Number. Apply the settings (the settings are added into the selection list of the Connected Systems .)

3. Click on Next > and then OK to create the project.

You have to configure the correct start sequence of managers in redundant distributed projects. Refer to Creating a redundant system and Create a distributed system for further information.

You have configured and created the systems Sys1,Sys2 and Sys3 with the settings described above. Note that when you configure a hierarchical structure it is sufficient to have a connection in one direction (see also Figure of the hierarchical structure of a distributed system).

main()
{
  int sysId;
  string sysNam;
  sysNam = getSystemName();
  DebugN("NAME IST:",sysNam);
  sysId=getSystemId(sysNam);
  DebugN("ID IST:",sysId);
}