# Easy way to map OPC tags to other OPC tags **URL:** \ **Category:** Ignition\ **Tags:** python, scripting, ignition81\ **Created:** [December 27, 2023, 9:06pm UTC](https://forum.inductiveautomation.com/t/easy-way-to-map-opc-tags-to-other-opc-tags/83558 "2023-12-27T21:06:51Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Ali\_Ali](https://avatars.discourse-cdn.com/v4/letter/a/bbe5ce/32.png) [@Ali\_Ali](https://forum.inductiveautomation.com/u/Ali_Ali)\ **Post date:** [December 27, 2023, 9:06pm UTC](https://forum.inductiveautomation.com/t/easy-way-to-map-opc-tags-to-other-opc-tags/83558/1 "2023-12-27T21:06:51Z")
Hello everyone. I want your suggestions for the easiest way to map tags. I have two machines connected to my Ignition gateway, one talks OPC UA (Ignition is the OPC client), and the other one is AB PLC. I need to map some tags from the first machine to AB PLC tags inside Ignition. I know it's easy to do with scripting on tags themselves (On Value Change) with simple system.tag.write, but is there any other way that is more efficient. Thanks ---
**Author:** ![ryan.white](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ryan.white/32/73193_2.png) [@ryan.white](https://forum.inductiveautomation.com/u/ryan.white)\ **Post date:** [December 27, 2023, 9:13pm UTC](https://forum.inductiveautomation.com/t/easy-way-to-map-opc-tags-to-other-opc-tags/83558/2 "2023-12-27T21:13:55Z")
Take a look at [transaction groups](https://docs.inductiveautomation.com/display/DOC81/Understanding+Transaction+Groups), you can kind of set them up to do OPC to OPC. > [@OPC to OPC with transaction group](https://forum.inductiveautomation.com/t/opc-to-opc-with-transaction-group/40630): > > I would like to move data between PLCs using a transaction group. Is this possible? Otherwise you need to go scripting route, easiest would be to script all the values you want to transfer in a single script