# VFD Modbus "timedout" problem

**URL:** <https://forum.onefinitycnc.com/t/vfd-modbus-timedout-problem/17947>\
**Category:** Spindle/VFD (Aftermarket/Unsupported)\
**Created:** [January 8, 2023, 5:49pm UTC](https://forum.onefinitycnc.com/t/vfd-modbus-timedout-problem/17947 "2023-01-08T17:49:47Z")\
**Posts on this page:** 1\
**Showing post:** 12

<div class="post-metadata">

**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [January 9, 2023, 9:05pm UTC](https://forum.onefinitycnc.com/t/vfd-modbus-timedout-problem/17947/12 "2023-01-09T21:05:14Z")

</div>

Hey Henrik,

the Onefinity Controller offers [PWM](https://en.wikipedia.org/wiki/Pulse-width_modulation) output that you get at the [corresponding pin](https://buildbotics.com/manual-v1-0/#pwm) and that is adjusted with the [PWM settings](https://buildbotics.com/manual-v1-0/#pwmspindle) on [TOOL page](https://buildbotics.com/manual-v1-0/#tooltab). It is usually needed by [PWM spindles](https://buildbotics.com/connecting-a-pwm-spindle-to-the-buildbotics-controller/).

Besides ModBus and Analog 0-10 V input, [my VFD](https://industrial.omron.co.uk/en/products/mx2) also has a PWM input. If your VFD has only analog 0-10 V voltage input but no PWM input, you need a [PWM to voltage converter](https://www.ebay.com/sch/i.html?&_nkw=pwm+to+voltage+converter) module. Take care to choose one that works with 3.3 V PWM input.

---

_[View the full topic](https://forum.onefinitycnc.com/t/vfd-modbus-timedout-problem/17947)._