# Analyze transitions 0% for a long time during the implementation of RT-BOX and c2000

**URL:** <https://forum.plexim.com/t/analyze-transitions-0-for-a-long-time-during-the-implementation-of-rt-box-and-c2000/828>\
**Category:** RT Box\
**Tags:** rt-box, c2000\
**Created:** [August 6, 2020, 10:28pm UTC](https://forum.plexim.com/t/analyze-transitions-0-for-a-long-time-during-the-implementation-of-rt-box-and-c2000/828 "2020-08-06T22:28:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![shichenseu](https://avatars.discourse-cdn.com/v4/letter/s/43a26b/32.png) [@shichenseu](https://forum.plexim.com/u/shichenseu)\
**Post date:** [August 6, 2020, 10:28pm UTC](https://forum.plexim.com/t/analyze-transitions-0-for-a-long-time-during-the-implementation-of-rt-box-and-c2000/828/1 "2020-08-06T22:28:26Z")

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![191](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/1X/142568483563a9f5f78aea31844442dbf7cd14b9.png)

I am a little confused ,when I implement a very simple model with simple algorithm into the RT-BOX or c2000,it only takes a few seconds to comple the process ,but when the model is a little complex ,it almost can’t complete the analyze process, the transitions analyze process is still 0% even after an hour,so what can I do to simplify the model and algorithm？

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**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\
**Post date:** [August 10, 2020, 3:44pm UTC](https://forum.plexim.com/t/analyze-transitions-0-for-a-long-time-during-the-implementation-of-rt-box-and-c2000/828/2 "2020-08-10T15:44:40Z")

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Could you describe your controller or circuit in more detail?

My suspicion is that you are using discrete switching devices instead of components from the Electrical + Power Modules section of the PLECS Library.

Please refer to the [RT Box Tutorials on the Plexim website](https://plexim.com/support/tutorials?body_value=All&field_tutorial_product_value=2) for a complete description of why the power modules are useful. The “RT Box: Timing and Step-Size Selection” tutorial will give a basic introduction to sub-cycle averaging concept and the power modules. The “RT Box: Model Optimizations” tutorial will further explain the exact “Analyzing Transitions” error you are seeing and provide guidance on how to optimize your model.

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**Author:** ![shichenseu](https://avatars.discourse-cdn.com/v4/letter/s/43a26b/32.png) [@shichenseu](https://forum.plexim.com/u/shichenseu)\
**Post date:** [August 10, 2020, 9:38pm UTC](https://forum.plexim.com/t/analyze-transitions-0-for-a-long-time-during-the-implementation-of-rt-box-and-c2000/828/3 "2020-08-10T21:38:42Z")

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Thank U so much, I cannot express my gratitudes using my words!!!