# In PLECS, the offline simulation results of the same simulation model differ greatly from the HIL simulation results. How can this problem be solved?

**URL:** <https://forum.plexim.com/t/in-plecs-the-offline-simulation-results-of-the-same-simulation-model-differ-greatly-from-the-hil-simulation-results-how-can-this-problem-be-solved/3054>\
**Category:** RT Box\
**Tags:** plecs, rt-box\
**Created:** [May 8, 2026, 11:22am UTC](https://forum.plexim.com/t/in-plecs-the-offline-simulation-results-of-the-same-simulation-model-differ-greatly-from-the-hil-simulation-results-how-can-this-problem-be-solved/3054 "2026-05-08T11:22:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Yinyu\_yan](https://avatars.discourse-cdn.com/v4/letter/y/bbce88/32.png) [@Yinyu\_yan](https://forum.plexim.com/u/Yinyu_yan)\
**Post date:** [May 8, 2026, 11:22am UTC](https://forum.plexim.com/t/in-plecs-the-offline-simulation-results-of-the-same-simulation-model-differ-greatly-from-the-hil-simulation-results-how-can-this-problem-be-solved/3054/1 "2026-05-08T11:22:39Z")

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I have built a model that can run successfully in RT-BOX 1. When running purely in PLECS offline, all simulation waveforms are normal. However, when the model is executed in RT-BOX 1, the waveforms are completely inconsistent with those from the offline simulation.

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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:** [May 8, 2026, 1:29pm UTC](https://forum.plexim.com/t/in-plecs-the-offline-simulation-results-of-the-same-simulation-model-differ-greatly-from-the-hil-simulation-results-how-can-this-problem-be-solved/3054/2 "2026-05-08T13:29:51Z")

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There isn’t enough information here to help you. The issues could range from model construction, application, HIL implementation, signal mapping, etc. You will have to post a model for additional guidance.