AH500 Programming Manual Symbol: None Explanation: The instruction NOP does not perform any operation in the program. Therefore, the original logical operation result is retained after NOP is executed. If users want to delete a certain instruction without changing the length of the program, they can use NOP instead. The instruction NOP only supports the instruction list in ISPSoft. It does not support ladder diagrams. Example: The instruction list in ISPSoft: Instruction: Operation: LD X0.0 Contact A of X0 is loaded. NOP No action OUT Y1.0 The coil Y1.0 is driven. 5-20 Instruction code Operand Function NOP - No operation