# Wago 750-880-040-001 Library error in Codesys v2.3

**URL:** <https://www.wago.community/t/wago-750-880-040-001-library-error-in-codesys-v2-3/2674>\
**Category:** CODESYS\
**Created:** [April 15, 2026, 5:00am UTC](https://www.wago.community/t/wago-750-880-040-001-library-error-in-codesys-v2-3/2674 "2026-04-15T05:00:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tolga.kizginel](https://avatars.discourse-cdn.com/v4/letter/t/a87d85/32.png) [@Tolga.kizginel](https://www.wago.community/u/Tolga.kizginel)\
**Post date:** [April 15, 2026, 5:00am UTC](https://www.wago.community/t/wago-750-880-040-001-library-error-in-codesys-v2-3/2674/1 "2026-04-15T05:00:42Z")

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I have Wago 750-880-040-001 models, older models I think. They’re set as the target device on Codesys v2.3, but when I select the device, 104 protocol dissappears and gives an error. How can I fix this? I can’t find the library online. Also, I couldn’t download the old program. In the old program, it was set to 2405, but the addresses are incorrect. I need to find the library and change the 104 addressing. WagoConfigToolLIB.lib error is given by the codesys program. Wago device has another program inside of it but I couldnt taken the program from the codesys.

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**Author:** ![RobPaq](https://avatars.discourse-cdn.com/v4/letter/r/ecb155/32.png) [@RobPaq](https://www.wago.community/u/RobPaq)\
**Post date:** [April 15, 2026, 8:32am UTC](https://www.wago.community/t/wago-750-880-040-001-library-error-in-codesys-v2-3/2674/2 "2026-04-15T08:32:01Z")

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Hello,  
I’m not sure it’s what you are looking for but if the configurator is not in the ‘PLC Configuration’,  
You can do the following :

 ![image](https://us1.discourse-cdn.com/flex016/uploads/wago/original/2X/6/6c439482b4047801d0f437da7bad60d3488a88cf.png)

You have now the configurators available:

 ![image](https://us1.discourse-cdn.com/flex016/uploads/wago/original/2X/d/d1ec83c03719a8874f7ac2a6d6383528e51b42dc.png)

 ![image](https://us1.discourse-cdn.com/flex016/uploads/wago/original/2X/a/ad550ec4b9f95688f7df7ba1ce37ae7d05fc75e0.png)

Previous configurations are going to be erased.  
Back-up first.

Hope it helps,