Number of connection count of Modbus TCP Driver

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dongil
Posts: 32
Joined: Mon Oct 07, 2013 1:42 am

Number of connection count of Modbus TCP Driver

Post by dongil » Wed Jan 09, 2019 10:27 pm

I tested about modbus tcp driver today.

When I set active for one device. The device got two connection number.

Why WinCC OA need two connection for one device active ?

Is there any way to get one connection ? We are only read from the device.

dongil
Posts: 32
Joined: Mon Oct 07, 2013 1:42 am

Re: Number of connection count of Modbus TCP Driver

Post by dongil » Tue Jan 15, 2019 9:39 pm

WinCC OA version is 3.15.

I tested it.
I have no idea why.. but some time it got one connection. sometimes it got 2 connection.
can you give me a answer why?

gschijndel
Posts: 20
Joined: Tue Jan 15, 2019 2:12 pm

Re: Number of connection count of Modbus TCP Driver

Post by gschijndel » Wed Mar 13, 2019 1:31 pm

With the default settings both servers of a redundant system will connect to the device.
At the Modbus PLC configuration you can configure that only the active server should connect to the PLC with the setting 'Only active driver'.

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3 posts • Page 1 of 1