# BC100, Codesys cannot find with IO Fault

**URL:** <https://www.wago.community/t/bc100-codesys-cannot-find-with-io-fault/1208>\
**Category:** CODESYS\
**Created:** [September 17, 2024, 8:30pm UTC](https://www.wago.community/t/bc100-codesys-cannot-find-with-io-fault/1208 "2024-09-17T20:30:39Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![durallymax](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@durallymax](https://www.wago.community/u/durallymax)\
**Post date:** [September 17, 2024, 8:30pm UTC](https://www.wago.community/t/bc100-codesys-cannot-find-with-io-fault/1208/1 "2024-09-17T20:30:39Z")

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Have two 750-8000’s on the bench, both FW 01.03.03(03).

Tried connecting to them without any cards attached, could network with them but Codesys cannot connect (tried scanning and manually defining). Tried with just a 750-600 attached. Same result. Added a 750-430 along with 750-600(which clears IO Fault), after a reboot Codesys can connect.

Have not experienced this with PFC200 (750-8212). Is this the intended operation or am I doing something wrong?

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**Author:** ![WagoIcard](https://sea2.discourse-cdn.com/flex016/user_avatar/www.wago.community/wagoicard/32/1508_2.png) [@WagoIcard](https://www.wago.community/u/WagoIcard)\
**Post date:** [September 18, 2024, 12:01am UTC](https://www.wago.community/t/bc100-codesys-cannot-find-with-io-fault/1208/2 "2024-09-18T00:01:31Z")

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Hello, indeed those are normal.  
The PFC series use a linux OS and an internal bus driver. Since the internal bus can be deasctivated, the linux OS and the runtime can still run without the internal bus.  
On the 750-8xx and 750-800x the internal bus in directly linked to the runtime and the firmware (non linux based).

In short, the PFC series don’t need anything (But having a 750-600 to protect the internal bus contact is higly recommended) and the 750-8xx and 750-800x need at last one module and a 750-600.

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**Author:** ![WagoKurt](https://sea2.discourse-cdn.com/flex016/user_avatar/www.wago.community/wagokurt/32/11_2.png) [@WagoKurt](https://www.wago.community/u/WagoKurt)\
**Post date:** [September 25, 2024, 5:41pm UTC](https://www.wago.community/t/bc100-codesys-cannot-find-with-io-fault/1208/3 "2024-09-25T17:41:15Z")

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I recommend you that you can ping the 750-8xxx devices from your laptop. Then make sure you are running the latest Codesys IDE from WAGO download center, which will come with the target drivers for your controllers.

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**Author:** ![durallymax](https://avatars.discourse-cdn.com/v4/letter/d/9fc348/32.png) [@durallymax](https://www.wago.community/u/durallymax)\
**Post date:** [September 25, 2024, 6:21pm UTC](https://www.wago.community/t/bc100-codesys-cannot-find-with-io-fault/1208/4 "2024-09-25T18:21:24Z")

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@WagoIcard thanks for the explanation, that tracks with my experience and makes sense.

@WagoKurt ping was fine (I realize I didn’t quite spell that out in original post), no issues in Codesys provided it has an IO card attached. Latest versions on everything, at that time.