# Major comms issues with Rockwell PLCs **URL:** \ **Category:** Ignition\ **Created:** [March 31, 2021, 8:06pm UTC](https://forum.inductiveautomation.com/t/major-comms-issues-with-rockwell-plcs/45141 "2021-03-31T20:06:15Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [March 31, 2021, 8:45pm UTC](https://forum.inductiveautomation.com/t/major-comms-issues-with-rockwell-plcs/45141/3 "2021-03-31T20:45:51Z")
Were there any firmware updates on affected processors? The very last v20 from Rockwell breaks IA's legacy drivers. See this and many similar topics: > [@Connecting to an AB compactlogix PLC](http://forum.inductiveautomation.com/t/connecting-to-an-ab-compactlogix-plc/42930): > > hello everyone. I am a new user, and I am having reading data from one of my A-B CompactLogix PLCs. I have others that I am connecting with just fine, but only reading analog data (DINTS and Floats). In this new one I am trying to read the bits from the Input and Output cards directly. it is a 1769-L35E CompactLogix5335E PLC running revision 20.19 firmware. For example I am trying to read all 16 bits from an input card in slot 2 of the local rack. The tags I’ve built OPC tags, Data Type = B… --- _[View the full topic](https://forum.inductiveautomation.com/t/major-comms-issues-with-rockwell-plcs/45141)._