# Modbus error "FC Not Valid" Yaskawa ga500

**URL:** https://discourse.nodered.org/t/modbus-error-fc-not-valid-yaskawa-ga500/58616
**Category:** Industrial
**Created:** [18 February 2022 18:23 UTC](https://discourse.nodered.org/t/modbus-error-fc-not-valid-yaskawa-ga500/58616 "2022-02-18T18:23:19Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Bester1234](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bester1234/32/56698_2.png) [@Bester1234](https://discourse.nodered.org/u/Bester1234)
#### Post date: [18 February 2022 18:23 UTC](https://discourse.nodered.org/t/modbus-error-fc-not-valid-yaskawa-ga500/58616/1 "2022-02-18T18:23:19Z")

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Can someone assist me with this error

"FC Not Valid"

2/18/2022, 7:27:29 PM[node: 876daccbf05b1c27](http://192.168.10.113:1880/#)msg : string[12]

"FC Not Valid"

none of the write Function Codes work, the same error on all Write functions this is a Yaskawa Drive ga500  
reading registers works fine

please assist

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<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [19 April 2022 18:23 UTC](https://discourse.nodered.org/t/modbus-error-fc-not-valid-yaskawa-ga500/58616/2 "2022-04-19T18:23:40Z")

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