Tags do not update after PLC power cycle (Ignition + Siemens Symbolic Driver, S7-1200 G2)

Ignition
1

After powering off the PLC for maintenance and turning it back on, Ignition does not update the tags automatically.

The PLC was powered off for more than one hour. During this time, the tag values in Ignition did not go into error state; instead, they showed a value of 0.

After powering the PLC back on, the tags still do not update and remain unchanged. However, when I refresh or re-save the device connection settings, the communication is immediately restored and the tags start updating correctly.

I am using:

  • Ignition Siemens Symbolic Driver

  • Siemens S7-1200 G2 PLC

Has anyone experienced similar behavior?
Any guidance would be greatly appreciated. Thank you.

2 Likes
2

The library we leverage for backing the new Symbolic Driver had some compatibility problems with the Siemens S7-1200 G2 devices. In 8.3.3 the library has been updated to a version that should have better compatibility. Is it possible to download the 8.3.3 RC1 and see if this issue is resolved for you?

1 Like
3

+1 to what Garth said. I wouldn't expect to be able to connect to a G2 S7-1200 with 8.3.2 or earlier. I'm surprised it even works sometimes.

4

Hi, thank you for your response. I’m working with Gateway Version 8.3.4-SNAPSHOT (b2025122409) and the module version is Siemens Enhanced Driver 1.3.4-SNAPSHOT (b2025122409).

5

I've not seen this, but I can try to reproduce it soon. Is it something you can reproduce again? If so, turn on debug logs for the Siemens driver before reproducing, then take a look or share those logs to see if there's anything relevant.

6

Hello, the system is currently running, and I can’t perform this test in the near future.
Please let me know if you are able to test it on your side.
Thank you.