Hello,

I have a project with s7 400H system and Wincc on step 7 v5.6. I want to use s7 fault-tolerant connection between PLC and WinCC but i can't use setting "Enable max redundancy( with 4 connections path). The tick for this setting is faded and i can't select it. Pls tell me how to select it. 

I send a picture about this problem

Hi.

Two years have passed since you made this question. Since I am having the same problem, can you advice whether you found a solution?

Thank you.

Very valuable answer

Clear.Mind

Hello. I think my answer will not valuable for you, but  for another who faced with this task will be. I spent 4 hours for find solution. Most valuable siemens documentation is Process control system PCS 7 High Availability Process Control Systems (page 160).

My troubel was that i make wrong connection H system CPs  with Plant Bus A and B. Need to connect CP1 with PlantBusA and CP2 with PlantBusB on CPU A, but on CPU B need connect CP1 with PlantBusB and CP2 with PlantBusA. (check box is grayscalled because it screenshoted at cross-project network view).