# Cc 100 751-9402 DIO problem

**URL:** <https://www.wago.community/t/cc-100-751-9402-dio-problem/2587>\
**Category:** Hardware and Linux\
**Tags:** cc100\
**Created:** [February 17, 2026, 7:58am UTC](https://www.wago.community/t/cc-100-751-9402-dio-problem/2587 "2026-02-17T07:58:25Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![huzlik](https://avatars.discourse-cdn.com/v4/letter/h/3d9bf3/32.png) [@huzlik](https://www.wago.community/u/huzlik)\
**Post date:** [February 17, 2026, 7:58am UTC](https://www.wago.community/t/cc-100-751-9402-dio-problem/2587/1 "2026-02-17T07:58:25Z")

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Hello, i have problem with DIO in 751-9402. When i have FW 28 i set DIO on DO in codesys and was fully functional. After upgrade to FW 30 (on the base of problém with Opc server - freezing opc server) i make new project with new DIO configuration, DO isnt functional. We directly set do to true bit led diode isnt light.

Where can be problem?