# Siemens un-optimized addressing.....does this even work? **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [July 5, 2022, 8:00pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537 "2022-07-05T20:00:58Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [July 5, 2022, 8:00pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/1 "2022-07-05T20:00:58Z")
Has anyone here tried this and it works? If so, can i get an example? ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/3/73fe6d8cd868d156b6b7c83ac674eb704aeca2fa.png) ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [July 5, 2022, 8:14pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/2 "2022-07-05T20:14:56Z")
What is that from? ---
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [July 5, 2022, 8:16pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/3 "2022-07-05T20:16:37Z")
> [@Instance db siemens](https://forum.inductiveautomation.com/t/instance-db-siemens/40699): > > Hi, I’m doing a migration from WINCC to Ignition, so there are some tags in a DB wich is a instance DB of a FB, so it isn´t a GLOBAL DB. There is any way to acces this instance DB from Ignition? I’m working with Ignition V8.0.12 ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [July 5, 2022, 8:17pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/4 "2022-07-05T20:17:23Z")
I don’t know what the user you quoted is talking about, that’s not syntax the Ignition S7 driver recognizes. ---
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [July 5, 2022, 8:18pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/5 "2022-07-05T20:18:28Z")
Yeah, thats what i thought. I figured if it did work you guys would put it in the manual. LOTS of people would be interested in this, lol. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [July 5, 2022, 8:19pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/6 "2022-07-05T20:19:27Z")
I’m sure, but Siemens’ official stance on opening or providing documentation on the S7 protocol is basically… hard no. They want you to use OPC UA for open access, and if you don’t have a newer PLC that supports it then too bad. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [July 5, 2022, 8:21pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/7 "2022-07-05T20:21:08Z")
There is a little German company that has done an _excellent_ job reverse engineering the S7 protocol, including all the bits nobody else has figured out, and has a pretty good OPC UA server for it: [OPC-Server for common PLCs](https://www.tanindustrie.de/en/Opc.php) ---
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [July 6, 2022, 3:32pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/8 "2022-07-06T15:32:05Z")
Thanks alot sir. This will defiantly be a great add-on for us! ---
**Author:** ![craigb](https://avatars.discourse-cdn.com/v4/letter/c/9f8e36/32.png) [@craigb](https://forum.inductiveautomation.com/u/craigb)\ **Post date:** [July 6, 2022, 6:34pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/9 "2022-07-06T18:34:48Z")
I use devices like below for MQTT , You can browse all the areas of the plc optimized or not. I don’t use the OPC side as I send the info via MQTT but you can then create a OPC server using the plc tags. [https://www.maplesystems.com/product/modelname/cmt-svr-opcua](https://www.maplesystems.com/product/modelname/cmt-svr-opcua) Not sure how much the cost compares to the software kevin posted. ---
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [July 6, 2022, 8:44pm UTC](https://forum.inductiveautomation.com/t/siemens-un-optimized-addressing-does-this-even-work/61537/10 "2022-07-06T20:44:23Z")
Thanks Craig! we will look into it