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unified hmi communication with s7 400H PLC with automatic hmi connection switch over witout script

2/18/2025 12:58 PM	Rate (0)
prajwalpednekar Regular Member Joined: 4/16/2021 Last visit: 11/18/2025 Posts: 2 Rating: (0)	unified HMI communication with s7 400H PLC with automatic HMI connection switch over without script. for redunducy

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2/18/2025 3:29 PM	Rate (0)
itafusna Gold Expert Joined: 2/17/2020 Last visit: 12/26/2025 Posts: 1251 Rating: (237)	Hi, I believe that it is not possible to perform the automatic connection change. This is only possible with an S7-1500R/H system, pointing to its system/virtual IP address. When communicating Unified systems with S7-400H redundant systems, you need the script (ChangeConnection function) to change the connection from one CPU to the other within the S7-400H system when the switchover occurs.
	A rating will be well appreciated.
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2/20/2025 10:41 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 12/19/2025 Posts: 16612 Rating: (1943)	Hello prajwalpednekar It should work similar to this one: https://support.industry.siemens.com/cs/ww/en/view/96837136 (with some small changes regarding WinCC Unified) Bye Murof
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