# Ignition Connection Problem with Siemens S7-300

**URL:** <https://forum.inductiveautomation.com/t/ignition-connection-problem-with-siemens-s7-300/26058>\
**Category:** Ignition\
**Created:** [June 24, 2019, 1:34pm UTC](https://forum.inductiveautomation.com/t/ignition-connection-problem-with-siemens-s7-300/26058 "2019-06-24T13:34:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![chris.neadley](https://avatars.discourse-cdn.com/v4/letter/c/97f17d/32.png) [@chris.neadley](https://forum.inductiveautomation.com/u/chris.neadley)\
**Post date:** [June 24, 2019, 1:34pm UTC](https://forum.inductiveautomation.com/t/ignition-connection-problem-with-siemens-s7-300/26058/1 "2019-06-24T13:34:06Z")

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Hi I am after some guidance hopefully, have a network with an S7-300 PLC with and S7-1200 polling it for data. I want to connect the S7-300 to ignition, this is where I am seeing the issue, Ignition will connect to the S7-1200 but not the 300.  
If i disconnect the S7-1200 PLC from the network ignition will connect straight to the S7-300 with no problems, has anyone come across this, I do not seem to be able to find any settings in Siemens hardware configuration and I am a bit at scratching my head now, I have changed the resourcing levels to accept a different number of connections but this hasn’t helped.

Anything to try would be good?

Regards

Chris

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**Author:** ![craigb](https://avatars.discourse-cdn.com/v4/letter/c/9f8e36/32.png) [@craigb](https://forum.inductiveautomation.com/u/craigb)\
**Post date:** [June 24, 2019, 6:51pm UTC](https://forum.inductiveautomation.com/t/ignition-connection-problem-with-siemens-s7-300/26058/2 "2019-06-24T18:51:23Z")

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IP address conflict ?

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**Author:** ![chi](https://avatars.discourse-cdn.com/v4/letter/c/0ea827/32.png) [@chi](https://forum.inductiveautomation.com/u/chi)\
**Post date:** [June 24, 2019, 7:13pm UTC](https://forum.inductiveautomation.com/t/ignition-connection-problem-with-siemens-s7-300/26058/3 "2019-06-24T19:13:08Z")

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The 1200 is polling the 300? What connection mechanism is used here?  
Check the connection resources in the hardware diagnostics (if available with your processor). Maybe the S7-1200 uses all resources of the S7-300.

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**Author:** ![chris.neadley](https://avatars.discourse-cdn.com/v4/letter/c/97f17d/32.png) [@chris.neadley](https://forum.inductiveautomation.com/u/chris.neadley)\
**Post date:** [June 28, 2019, 10:20am UTC](https://forum.inductiveautomation.com/t/ignition-connection-problem-with-siemens-s7-300/26058/4 "2019-06-28T10:20:40Z")

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Thanks for the replies, not an IP conflict, I will try check the resources.

I am more thinking this is a Siemens frist come frist server issue witht he S7-300 as the S7-1200 is dealing with Ignition and two other PLC’s all over Ethernet connection