The Programmable Controller sets the beginning and ending step numbers to edit with the E0 and E1 Event Step Edit commands. When the E3 Event Step Edit command is issued—which actually performs the step table modifications—the beginning and ending step numbers are checked. Both must hold valid step numbers (between 0 and 255, inclusive), and the ending step number must be greater than or equal to the starting step number.
If the beginning and ending step numbers are out of range or reversed, this parameter error is generated.
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