I have an issue with Reading tags from the PLC ( it’s a S7-1500 ). I’ve configured manually some tags as the Manual says: [S7-1500]DB1001,X0.0 for a Bolean tag inisde the DB1001 The PLC is connected and it’s seen by Ignition. If I enable the option “OPC Read After Write” inside the Scan Class, I’…

I found out what was the issue! I had one tag, with this grammar " [S7-1500]DB201,ISTRING1024.256 " for a string tag. The “I” before STRING was causing the issue! After I edit that grammar to “[S7-1500]DB201,STRING1024.256” everything went fine. Thanks to all for the help! I really appreciated it…

After the DB number should be a comma, not a full stop. So for your example above it should be [S7-1500]DB1001,X0.0

Ups :sweat_smile: I misswrote that part in the post. Inside Igntion it’s correctly written. Thanks anyway :slight_smile:

After everything you said, it should work. And read after write should not make any difference. How is the gateway connected to the PLC? Have you looked at the logs on the gateway page? There should be some indications what’s going on…

[image] zxcslo: Have you looked at the logs on the gateway page? There should be some indications what's going on... I'm full of this Warning message [image]

In my experience, in this case, the best you can do is: delete all tags in designer Tag Browser delete all scan classes close everything (clients, designer) delete the connection to PLC stop gateway restart PC/VM do everything in reverse order (plc connection, scan classes, tags…) I think, that S…

Can you provide support with your logs and a tag export or some other list of tags you have created for this device? There seems to be some internal error in the UA server happening, but there’s not enough information in the screenshot to know more.

“system_logs_26gen2018-16-11-42” <<— This file is too large for being uploaded here, i’m doing it with WeTransfer, here it is the link: https://wetransfer.com/downloads/2231c779e8d8d8a510a2a24fc614d7cc20180126152350/efdaf72c64ec31ff498217a6622be2a720180126152350/b5927b the other file is an export…

Looking at your tags.xml I see that you configured String tags with 256 bytes lenghts. Ignition siemens driver supports ONLY 202 bytes. Change your string tags and you’re good. I had the same problem some years ago (you can search the forum for my post) and spend many hours until I found the prob…

There are more options then using Ignition’s S7-driver with your S7/1500. First option, PLC firmware 2.0 and above has a built in OPC_UA server. Second option, use Simatic Net from Siemens. It does the absolute to symbolic conversion for you. This allows you to come in with ignition OPC_UA client…

Thank you for your suggestions Mike :wink: I’ll try what you suggest :slight_smile: Cheers,

Inductive Automation Forum

Can't Read Tags but can Write them

Ignition

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