Hello Yahya97

I´m not sure if this will work with a third party SCADA...

The solution you are referring to is for WinCC V7/8

Bye Murof

 Hi Yahya97,

Did you get the solution for this? I'm also trying the same S7-400H CPU withTIA 19 wincc professtional. I can able to read the values of @<...>@ForceConnectionState & @<...>@ConnectionState but for the @PLC1@ConfiguredAddress & @PLC1@AlternativeAddress & @PLC1@CurrentAddress I'm not able to read the values. 

Is there any syntax i have to use? can you share your testing backup. 

Yahya97

i have a simplex SCADA connected to CPU 1515R-2PN as shown in the attached system block diagram, and i want to use the software redundancy, I implemented everything mention in the link including the script and edited it to my connection name.

Before i do the test this is the State of the program:

1) @PLC1@ConnectionState is 1

2) @PLC1@ForceConnectionState is 1

3) @PLC1@ConfiguredAddress & @PLC1@AlternativeAddress & @PLC1@CurrentAddress are all correct.

Then I disconnect the ethernet cable between the Primary PLC X2 Port and the ethernet switch, this is what happens:

1) @PLC1@ConnectionState becomes 0

2) @PLC1@ForceConnectionState becomes 0

2) @PLC1@UseAlternativeAddress becomes 1

3) @PLC1@ForceConnectionState becomes 1

4) @PLC1@CurrentAddress becomes the alternative address

but the Wincc doesn’t connect to the secondary PLC even though the connection is established and I can ping it.

I was wondering if there is another missing step im not doing.

Hello Jaikumar sekar 

the Software Redundancy functionality from WinCC V8 should also work with WinCC Prof V19. I used it in older WinCC Prof versions, you would have to set scripts and Tags manually but it should work analog to WinCC V8 (But its not a released feature or WinCC Prof, so youhave to try and there is no example project available )

Bye Murof