# Write data from PLC SIM to factory i/o

**URL:** https://community.factoryio.com/t/write-data-from-plc-sim-to-factory-i-o/3842
**Category:** Uncategorized
**Created:** [March 19, 2025, 5:53pm UTC](https://community.factoryio.com/t/write-data-from-plc-sim-to-factory-i-o/3842 "2025-03-19T17:53:23Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![ngoquocchinh12a1](https://avatars.discourse-cdn.com/v4/letter/n/ed8c4c/32.png) [@ngoquocchinh12a1](https://community.factoryio.com/u/ngoquocchinh12a1)
#### Post date: [March 19, 2025, 5:53pm UTC](https://community.factoryio.com/t/write-data-from-plc-sim-to-factory-i-o/3842/1 "2025-03-19T17:53:23Z")

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I use WINCC to make an example to turn on and off the light bulb and it still works. When connecting to Factory i/o via PLCsim, it cannot be turned on or off via HMI, but HMI can still show the light on when pressing the button on Factory i/o. Please help me, thank you everyone.