wincc实现软冗余手册

1 Software Redundancy

Within WinCC, the software redundancy feature makes it possible to monitor

critical sections of a plant by using a redundant connection to several PLCs.

Software redundancy considerably improves reliability when critical plant

sections are to be monitored. For example, a redundant connection to two

PLCs means that one PLC takes over if the other PLC fails. Using software

redundancy does not mean that you can only establish redundant connections

to the PLCs configured. It is still possible to connect any PLC in a non-

redundant layout. The switchover between redundant PLCs is performed

automatically in the event of a malfunction. However, a manual switchover is

also possible by specifying a tag (@ForceConnectionState).

Note

Establishing a redundant connection requires two PLCs.

Setting up software redundancy:

In order to use software redundancy under WinCC, the following settings are required in the Control Center:

Step 1

The computer properties must be set to the following values:

Step 2

Within the Alarm Logging system, the "short-term archive" must be

activated:

If the "short-term archive" has not yet been activated, proceed as follows: In the navigation window, open the pop-up menu of the "Archives" object and select the "Add/Remove" menu item. Within the "Assign Storage

Parameters" dialog box, activate the "Short-Term Archive Active" check box.

Step 3

Within the Alarm Logging, the system messages must be retrieved; select the "Options" and "WinCC System Messages" menu items for this

purpose. In the "WinCC system messages" dialog box, activate the "Create New System Messages Only" option and press the "Create" button. This procedure retrieves the system messages associated with software

redundancy.

Step 4

By means of the "DynWizEdit.exe" program, integrate the Dynamic

Wizard for software redundancy into the WinCC system (Graphics

Designer). This integration procedure requires the following steps: In the Windows Explorer, start the "C:\Siemens\WinCC\bin\DynWizEdit.exe"

program. Select the "German" language in the toolbar. Retrieve the

"C:\Siemens\WinCC\wscripts\wscripts.deu\SW_Redundanz.wnf" script by selecting the "Dynamic Wizard" and "Retrieve Wizard Script" menu

items. The compilation progress is shown in the output window. After the compilation has been completed successfully, the new entry "Establish

Redundant Connection" appears in the "Dynamic Wizard" window.

Step 5

Integrate the "SIMATIC S7 PROTOCOL SUITE" communications driver within the tag management.

Step 6

Within the required bus type (e.g. MPI), create a logical connection in the "SIMATIC S7 PROTOCOL SUITE" communications driver. Give an

expressive name to this connection.

Step 7

Open an existing picture in the Graphics Designer. Within the Dynamic-Wizard (in the "System Functions" tab), start the "Establish Redundant

Connection" program by double-clicking.