1. Try to avoid using "double words" when you can use "words", and try to prevent using real numbers when you can use integers.
2. Give priority to the use of surplus (other than hardware connection) IB, IW, ID, QB, QW, QD, followed by M and S;
3. Try to prevent the conversion of data types, and try to use AC to store intermediate variables when necessary to reduce the number of conversions. For example, when using VW2 to save integers, VW0 can directly visit the data in VW2 in the form of VD0.
4. Reduce unnecessary network scanning, and classify the network that can be executed conditionally (especially AIW and AQW) into subroutines for conditional invocation (such as punctual interruption);
5. Use XOR instructions to negate any bit (this instruction is slightly difficult, and it is necessary to carefully align the position in debugging, and it is advocated to use binary numbers when programming);
6. Under the premise of ensuring the process requirements, appropriately reduce the frequency of interruption;
7. The subroutine should try to reduce the number of condition discrimination, standardize the import and export parameters of the subroutine, and then reduce the code redundancy.
8. For repetitive and time-consuming missions, it should be handled in cycles; This includes spreading the initialization job over multiple cycles. The sampling time of multiple PID loops is slightly different to prevent multiple interrupt calls in the same cycle, making the scan cycle more uniform and stable.
9. Regarding the subroutine call with less input data, you can first judge whether the input data has changed, if there is no change (please refer to the 48th floor for comparison method), you can directly bypass the subprogram, and then reduce the scanning cycle.
10. Try to arrange the bit variables in the V region in V511.7, and arrange the VB/VW/VD variables with high frequency in V4095, which can shorten the program scanning cycle.
11. If SM0.0 is connected in series with other signals, it only increases the program size and execution time, and has no other role (if the network has met the necessary contacts on the left, there is no need to connect SM0.0 in series);
12. When there is no need to share signals, multiple instructions placed in the same network will have a rated entry and exit stack operation (the details can be converted into STL for analysis), and if it is not a logical requirement, it should be prevented from being connected horizontally, so that at least one "and" instruction can be reduced. The good thing is that it's just a little bit more compact in a network.
13. Rational use of immediate IO instructions (try to reduce the use) to save the time of PLC processing of immediate instruction.
14. Try to use the accounting result memory in the accounting, instead of the transition memory.
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