# Siemens S7-300 slow response time

**URL:** <https://forum.inductiveautomation.com/t/siemens-s7-300-slow-response-time/38925>\
**Category:** Ignition\
**Created:** [September 22, 2020, 10:52am UTC](https://forum.inductiveautomation.com/t/siemens-s7-300-slow-response-time/38925 "2020-09-22T10:52:22Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Sonny\_Vallgren](https://avatars.discourse-cdn.com/v4/letter/s/e19b73/32.png) [@Sonny\_Vallgren](https://forum.inductiveautomation.com/u/Sonny_Vallgren)\
**Post date:** [September 22, 2020, 10:52am UTC](https://forum.inductiveautomation.com/t/siemens-s7-300-slow-response-time/38925/1 "2020-09-22T10:52:22Z")

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Hi all,

We have a setup using 7.9.10 connecting to a Siemens 317fpn/dp on the PLC:s internal ethernet interface.  
The PLC is configured to use 50% of the cpu for communication and the PLC scan cycle time is still below 10ms. So not much load on the PLC because of the plc program.

Twice a day almost on a daily basis we get slow response reading tags in ignition.  
The issue remains for about 30 minutes and then it goes back to normal.

Bad response:

 ![bad response](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/f/af0e5dd29dae1a93800064c7f8eec401304c49e2.png)

Normal response:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/8/a/8a143faeed4f1520b085c5bb888a70f1b1f6e524.png)

Any ideas?

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [September 22, 2020, 12:25pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-300-slow-response-time/38925/2 "2020-09-22T12:25:22Z")

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Do you have some form of automatic PLC backup system that runs regularly? I would expect PLC programmer operations to create this sort of conflict. The open protocol Ignition uses has lower priority than programmer actions.

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<div class="post-metadata">

**Author:** ![Sonny\_Vallgren](https://avatars.discourse-cdn.com/v4/letter/s/e19b73/32.png) [@Sonny\_Vallgren](https://forum.inductiveautomation.com/u/Sonny_Vallgren)\
**Post date:** [September 22, 2020, 12:33pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-300-slow-response-time/38925/3 "2020-09-22T12:33:17Z")

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No, nothing else connects to the PLC.

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<div class="post-metadata">

**Author:** ![Sonny\_Vallgren](https://avatars.discourse-cdn.com/v4/letter/s/e19b73/32.png) [@Sonny\_Vallgren](https://forum.inductiveautomation.com/u/Sonny_Vallgren)\
**Post date:** [September 23, 2020, 3:38am UTC](https://forum.inductiveautomation.com/t/siemens-s7-300-slow-response-time/38925/4 "2020-09-23T03:38:53Z")

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Is there a way to log “Mean response time” or “Load factor”.  
It would be great for troubleshooting, pinpoint the hours when the error occurs.