Problems connecting to S7-1500

[funkey]

Hello,
I have connected WinCCOA to a lot of Siemens PLCs, only one is an S7-1500. Every time the server restarts, all other PLC get connected, but it last at least two or three minutes to get the S7-1500 connected properly.
After getting this error message it works:

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WCCOAs7      (1), 2015.08.05 15:04:38.073, SYS,  SEVERE,     13/s7, Allgemeiner AGLink-Fehler (0xfff50005) für S7_1500(21/1), 14, 33028

I get a similar message for the other PLCs right after the S7 driver has started, but then it is a warning only with this error number: 0xfff5001c.

I hope there is something I can do against it.
Thanks for any help

Best regards
Christoph

[Gertjan van Schijndel]

Did you try one of the following config entries?

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[s7]
UseOneConnection = "Y"
UseConnections = 1

[funkey]

I have about 20 PLCs and I need to have at least two connections to the most of them. And I cannot setup this for every PLC. But do you think this is the problem? A S7-1500 should accept more than one connection?

[Gertjan van Schijndel]

If I remember correctly the driver sets up the connections simultaneously, which causes the delay. When the connections are established after each other, it works better.

[funkey]

But then is nothing I can do about it, right? There is no delay setting for additional connections?

[Gertjan van Schijndel]

The only thing you can do is limit the number of connection to one. Why can you not do this?

[funkey]

Because of the amount of data. I cannot poll all data from some PLCs within two seconds with only one connection.

[Gertjan van Schijndel]

Perhaps you could optimize the data communications. Reduce the number of memory blocks the driver has to read and/or look into the 'Unsolicited' receive mode options (TSPP and/or unicos).
Another option to use 2 connections with the PLC is to define the PLC twice and spread the poll data over these connections.

[funkey]

The system now runs for more then 10 years and I don't want to reconfigure the hole system because of a driver bug. There was no problem with version 3.9, but since V3.11 I get this error messages from S7 driver when connecting to the PLCs. I know there is another option, I could use a second S7 driver instance for the S7-1500 PLC and for PLCs with few datapoints. But this is not the way I want to go.