Code 17020: [Channel %1: ] Block %2 illegal array index 1

Parameters: %1 = Channel number %2 = Block number, label Definitions: General: A read or write access has been programmed to an a rray variable with an invalid 1st array index. The valid array indices must lie within the defined array size and the absolute limits (0 - 32,766). PROFIBUS I/O: An invalid slot / I/O area index was used while reading/writing data. Cause: 1.: Slot / I/O area index >= max. number of available slot / I/O areas. 2.: Slot / I/O area index references a slot / I/O area that has not been configured. 3.: Slot / I/O area index references a slot / I/O area that has not been released for a system variable. The following applies specifically: If the alarm oc curs while writing from one of the parameters $TC_MDP1/$TC_MDP2/$TC_MLSR, check whether MD18077 $MN_MM_NUM_DIST_RE L_PER_MAGLOC has been set correctly. MD18077 $MN_MM_NUM_DIST_REL_PER_MAGLOC defines the number of different Index1 statements that may be made for an Index2 value. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: Correct the specification of array elements in t he access instruction to match the defined size. If an SPL is used in Safety Integrated, the field index via optional data may be subject to additional restrictions. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the program.