Improve the efficiency of PLC operation and reduce execution time when completing similar tasks. Note: Beginners don't need to worry about the practices mentioned here. They can read the program and understand the specifications to meet functional requirements. 1. When possible, use "words" instead of "double words," and prefer integers over real numbers. 2. Prioritize using IB, IW, ID, QB, QW, QD (excluding hardware connections), followed by M and S. 3. Avoid data type conversions where possible. If necessary, store intermediate variables in AC to minimize conversions. Also, reserve storage space during programming—for example, if VW2 is used to store an integer, avoid using VW0, and access the data directly as VD0. 4. Reduce unnecessary network scanning by grouping conditionally executed networks (especially AIW, AQW) into subroutines for conditional calls, such as timed interrupts. 5. Use the XOR instruction to reverse bits arbitrarily. This requires careful debugging and is easier to handle with binary numbers. 6. Under the premise of meeting process requirements, reduce the frequency of interrupts. 7. Minimize conditional checks in subroutines, standardize input and output parameters, and reduce code redundancy. 8. For repetitive or time-consuming tasks, use sub-cycle processing. This includes spreading initialization work across multiple cycles and adjusting the sampling times of multiple PID loops to avoid multiple interrupt calls in the same cycle, resulting in a more stable scan cycle. 9. For subroutines with minimal input data, first check if the input has changed. If not, skip the subroutine to reduce the scan cycle. 10. Place bit variables in V511.7 and high-frequency VB/VW/VD variables in V4095 to shorten the program scanning cycle. 11. Connecting SM0.0 in series with other signals only increases program size and execution time without any additional function. It's unnecessary if the network already meets the required conditions on the left side. 12. Avoid placing multiple instructions in the same network unless necessary, as it adds extra operations. If not logical, avoid inline horizontal logic, which can reduce the number of "AND" instructions. This makes the network more compact and efficient. 13. Use immediate I/O commands wisely to reduce the conversion time required by the PLC for these instructions. 14. Prefer using calculation result memory over transition memory for better performance. These tips are designed to help experienced users optimize their PLC programs for speed and stability while maintaining readability and maintainability.
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