# Modbus ExceptionCode 0x01 (IllegalFunction)

**URL:** <https://forum.inductiveautomation.com/t/modbus-exceptioncode-0x01-illegalfunction/14039>\
**Category:** Ignition\
**Created:** [April 13, 2017, 2:37pm UTC](https://forum.inductiveautomation.com/t/modbus-exceptioncode-0x01-illegalfunction/14039 "2017-04-13T14:37:56Z")\
**Posts on this page:** 1\
**Showing post:** 22

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**Author:** ![patrixmith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/patrixmith/32/75926_2.png) [@patrixmith](https://forum.inductiveautomation.com/u/patrixmith)\
**Post date:** [April 13, 2017, 6:01pm UTC](https://forum.inductiveautomation.com/t/modbus-exceptioncode-0x01-illegalfunction/14039/22 "2017-04-13T18:01:22Z")

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It’s all good.

Yeah, quite strange, especially since all of the registers I am asking for under this device are returning with good, changing values that match the PLC.

I’ll keep digging into the device and it’s communication configuration.

Cheers, Kevin.

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