# Rockwell Firmware Compatibility

**URL:** <https://forum.inductiveautomation.com/t/rockwell-firmware-compatibility/35910>\
**Category:** Ignition\
**Created:** [June 23, 2020, 12:23pm UTC](https://forum.inductiveautomation.com/t/rockwell-firmware-compatibility/35910 "2020-06-23T12:23:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bakern](https://avatars.discourse-cdn.com/v4/letter/b/3bc359/32.png) [@bakern](https://forum.inductiveautomation.com/u/bakern)\
**Post date:** [June 23, 2020, 12:23pm UTC](https://forum.inductiveautomation.com/t/rockwell-firmware-compatibility/35910/1 "2020-06-23T12:23:10Z")

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Hello,

How do I know what firmware version of drivers are compatible with certain versions of Rockwell PLC’s? I tried flashing a 1769-L32E to a version 20.18 and Ignition would not communicate with it. I had to back it down to 20.14. I will be growing the system and want to flash these PLC’s up to newer. I will be upgrading Ignition from 7.5.11 to 7.9.14

Thank you,

Nic

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [June 23, 2020, 12:30pm UTC](https://forum.inductiveautomation.com/t/rockwell-firmware-compatibility/35910/2 "2020-06-23T12:30:48Z")

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The “legacy” CompactLogix and ControlLogix driver (the only options back in 7.5) only work up to 20.15 I think.

In firmware v21 they disabled direct memory access and implemented a new API for accessing tags. Then in later versions of 20.xx they also disabled direct memory access but did not provide the new API; only the old and much slower symbolic access is available.

The new Logix driver introduced in 7.7 can be used for these later 20.xx versions and all 21+ firmwares.

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**Author:** ![code\_skin](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@code\_skin](https://forum.inductiveautomation.com/u/code_skin)\
**Post date:** [June 23, 2020, 12:39pm UTC](https://forum.inductiveautomation.com/t/rockwell-firmware-compatibility/35910/3 "2020-06-23T12:39:29Z")

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I can confirm the following with the driver introduced in 7.7:

- Logix Driver \>= 20.12
- Legacy Driver \<= 20.11

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**Author:** ![bakern](https://avatars.discourse-cdn.com/v4/letter/b/3bc359/32.png) [@bakern](https://forum.inductiveautomation.com/u/bakern)\
**Post date:** [June 23, 2020, 1:28pm UTC](https://forum.inductiveautomation.com/t/rockwell-firmware-compatibility/35910/4 "2020-06-23T13:28:41Z")

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thank you for the quick reply