T04-C16 troubleshooting answers
1 question with answers cited from the manufacturer manuals.
- 0ControlLogix 5570 Major Fault T04:C16 after program download, what to check?
A Major Fault T04:C16, or 'Unknown Instruction', indicates the controller encountered an instruction it doesn't recognize during program execution. This typically happens after a program download, especially if the proje…