# \#safemotion

**URL:** https://community.br-automation.com/tag/safemotion/170.md

[Latest](https://community.br-automation.com/latest.md) · [Categories](https://community.br-automation.com/categories.md) · [Tags](https://community.br-automation.com/tags.md)

---

## [Upgrading from 8BVIxxx-1 and 8BVIxxx-3 SafeMOTION ACOPOSmulti modules to 8BVIxxx-4 modules](https://community.br-automation.com/t/upgrading-from-8bvixxx-1-and-8bvixxx-3-safemotion-acoposmulti-modules-to-8bvixxx-4-modules/9234)

<div class="topic-metadata">

**Author:** [@lukas.struber](https://community.br-automation.com/u/lukas.struber)\
**Replies:** 1\
**Last updated:** [April 15, 2026, 1:12pm UTC](https://community.br-automation.com/t/upgrading-from-8bvixxx-1-and-8bvixxx-3-safemotion-acoposmulti-modules-to-8bvixxx-4-modules/9234 "2026-04-15T13:12:56Z")

</div>

When upgrading the ACOPOSmulti SafeMOTION hardware in a machine from 8BVIxxx-1 or 8BVIxxx-3 SafeMOTION ACOPOSmulti modules to 8BVIxxx-4 modules it is important to note that the hardware upgrade in Automation Studio needs…

---

## ["Alive test" position lag error tolerance](https://community.br-automation.com/t/alive-test-position-lag-error-tolerance/9634)

<div class="topic-metadata">

**Author:** [@Swee\_Hoe](https://community.br-automation.com/u/Swee_Hoe)\
**Replies:** 10\
**Last updated:** [January 13, 2026, 9:27am UTC](https://community.br-automation.com/t/alive-test-position-lag-error-tolerance/9634 "2026-01-13T09:27:18Z")

</div>

From the help: Tuning rule for position lag error tolerance The position lag error tolerance is not permitted to be higher than half of one pole length! It refer to mechanical pole length or electrical pole length?