T04-C20 troubleshooting answers
1 question with answers cited from the manufacturer manuals.
- 0ControlLogix 5570 T04:C20: Invalid Array Subscript in Run, what to check?
A ControlLogix or CompactLogix controller displaying a Major Fault T04:C20 indicates a program fault where an array subscript was too large for the array, or the .POS or .LEN value of a CONTROL structure was invalid. Thi…