# Siemens S7-PLCSIM - Error Code -4, DoesNotExist

**URL:** <https://community.factoryio.com/t/siemens-s7-plcsim-error-code-4-doesnotexist/4115>\
**Category:** Support\
**Created:** [May 29, 2025, 3:01pm UTC](https://community.factoryio.com/t/siemens-s7-plcsim-error-code-4-doesnotexist/4115 "2025-05-29T15:01:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Chirez](https://avatars.discourse-cdn.com/v4/letter/c/7c8e57/32.png) [@Chirez](https://community.factoryio.com/u/Chirez)\
**Post date:** [May 29, 2025, 3:01pm UTC](https://community.factoryio.com/t/siemens-s7-plcsim-error-code-4-doesnotexist/4115/1 "2025-05-29T15:01:20Z")

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Hey guys, I have have tried for many hours to fix this issue, But I cannot connect to the PLC-Sim anymore on Factory IO. It has worked flawlessly for over a year while I’ve been in studying (We have used TIA18) - But now it doesn’t work anymore when I try to connect, I have also tried with TIA portal 19. I’ve tried to also re-install all the programs, and checked the licenses, but when I press “Connect” it says "Error Code : -4, DoesNotExist

I can modify the program in TIA portal without any issues, but got no connection to FactoryIO. Any suggestions?

> **[PLCSIM Does Not Exist — Postimages](https://postimg.cc/gxv473nq)**

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**Author:** ![adriana.silva](https://dub1.discourse-cdn.com/flex017/user_avatar/community.factoryio.com/adriana.silva/32/752_2.png) [@adriana.silva](https://community.factoryio.com/u/adriana.silva)\
**Post date:** [May 29, 2025, 3:51pm UTC](https://community.factoryio.com/t/siemens-s7-plcsim-error-code-4-doesnotexist/4115/2 "2025-05-29T15:51:20Z")

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Hello @Chirez,

Could you please confirm which PLC Model you have selected in Factory I/O, in the driver’s configurations?  
It seems like you are simulating an S7-1500, so that should be the selected model.

 ![image](https://europe1.discourse-cdn.com/flex017/uploads/factoryio/original/1X/d3972b1932a63a2ebfb53d9b1b328c6e43bda845.png)