Sync OPC Tag from different PLC

Hello everybody,
I’ve two integer OPC TAG from two different PLC (example PLC1 and PLC2) .
I would like when PLC1 change write PLC2 with same value.
I tried with “Tag event script -> value changed” and works fine but, if I’ve PLC2 off, PLC1 change and then PLC2 on the value on PLC2 is old. In this way are not syncronized until PLC1 change.
How can I do to solve this problem ?
Thank you very much


Two ideas for you.

  • Use a transaction group.
  • Use a gateway timer script.

Thank you Jordan,
I will try with a transaction group.