Sinumerik Alarm 17020 Channel %1 block %2 illegal array index 1
%1 = Channel number
%2 = Block number, label
A read or write access has been programmed to an array variable with invalid 1st array index. The valid array indices must be contained within the defined array size and the absolute limits (0 – 32 766).
– Alarm display.
– Interface signals are set.
– Correction block is reorganized.
Correct the specification of array elements in the access instruction to match the defined size.
Clear alarm with NC START or RESET key and continue the program.
- Siemens Diagnostics Guide by Siemens