# Any known S7400 connection issues?

**URL:** <https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314>\
**Category:** Ignition\
**Created:** [September 21, 2011, 9:05pm UTC](https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314 "2011-09-21T21:05:44Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![MiddleC](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@MiddleC](https://forum.inductiveautomation.com/u/MiddleC)\
**Post date:** [September 21, 2011, 9:05pm UTC](https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314/1 "2011-09-21T21:05:44Z")

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I have no trouble configuring S7300 device connections. However, cannot connect to any S7400 (e.g. CP443-1 communication processor) devices.

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**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:** [September 21, 2011, 10:55pm UTC](https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314/2 "2011-09-21T22:55:58Z")

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Nothing that I can think of unless you’ve got the wrong rack and slot configured (or those properties aren’t working correctly).

Maybe you can call into support and we can poke around?

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**Author:** ![MiddleC](https://avatars.discourse-cdn.com/v4/letter/m/839c29/32.png) [@MiddleC](https://forum.inductiveautomation.com/u/MiddleC)\
**Post date:** [September 22, 2011, 2:12am UTC](https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314/3 "2011-09-22T02:12:55Z")

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Well, don’t I feel like a DA…I didn’t modify device advanced settings. All S7300 cpus are in slot 2 while 400s are in slot 4.

Thank you Kevin.

[quote=“Kevin.Herron”]Nothing that I can think of unless you’ve got the wrong rack and slot configured (or those properties aren’t working correctly).

Maybe you can call into support and we can poke around?[/quote]

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**Author:** ![Antonio](https://avatars.discourse-cdn.com/v4/letter/a/6de8d8/32.png) [@Antonio](https://forum.inductiveautomation.com/u/Antonio)\
**Post date:** [January 31, 2017, 7:19am UTC](https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314/4 "2017-01-31T07:19:54Z")

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Hi MiddleC  
I have exactly the same problem with a S7 400 and CP443. Did you find out how to make it work?

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**Author:** ![MrPeter](https://avatars.discourse-cdn.com/v4/letter/m/ed655f/32.png) [@MrPeter](https://forum.inductiveautomation.com/u/MrPeter)\
**Post date:** [January 31, 2017, 12:24pm UTC](https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314/5 "2017-01-31T12:24:22Z")

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Hi!  
I have a connection s7-400:  
hostname = ip for CP443  
rack number = 0  
CPU slot number = 3

CPU slot is the problem for you ! The CP443 is in slot 4 the CPU is in slot 3., you need to put the cpu slot in ignition.  
Verifi this and should work !

Best regards !

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**Author:** ![Tobias](https://avatars.discourse-cdn.com/v4/letter/t/c67d28/32.png) [@Tobias](https://forum.inductiveautomation.com/u/Tobias)\
**Post date:** [February 1, 2017, 11:02am UTC](https://forum.inductiveautomation.com/t/any-known-s7400-connection-issues/3314/6 "2017-02-01T11:02:10Z")

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Thank you, it works 🙂