1. When the PLC and the host computer (or touch screen) form a monitoring system, there are many times on the screen that there are "manual", "active" and other control modes (generally more than one). In the program, you can use the "MOV" command. For example, when selecting "manual", the constant 1MOV will be placed in a register VB10, and when "active" will be selected, 2MOV will be placed in the same register VB10. As long as you determine how much data is in the register, you will know what kind of control method the system is. The advantage of this line of thinking is that it is easy to understand and does not require cumbersome procedures such as interlocks.
2. When the program has analog control, if the analog quantity read is basically correct, the method of time filtering can be adopted to delay a period of time. If the error in the read data is large, it is necessary to use other filtering methods, such as averaging. Ability to consult relevant materials.
3. In the process of program debugging (especially when the equipment is transformed, when your program is added to the program of the original equipment), when the presentation conditions in the program sentence are satisfactory, and the output coil is not connected, you can check whether your program is between such sentences, such as JUMPgoto and other sentences. There is also a possibility that after interrupting the program, the condition is satisfactory and the output is not connected, and generally this part of the program is not scanned.
4. In the sequence control program, that is, after the end of one action, enter the next action, and other similar order control, using +10+10 control mode, I think it is very convenient. The idea is: preset a register, the value is 0 at the initialization, when the system is started, +10 for it, the register is 10 at this moment, and the register is equal to 10 when the first action can be made; After the first action is finished, then +10 to the register, the register is equal to 20 at the moment, and the second action can be done after the second action is finished, and the register is equal to 30 at this moment, so that as long as you judge how much data is in the register, you will know that you want to end the action. When the demand beats the action, it can no longer be +10, but can be added +20+30... Why add 10 instead of 1, because after adding 10, if you pierce a section, you can just pick a random position in these 10 free places.
5. When designing the program, when there is a problem in the process (non-control system control), it is best to keep the fault phenomenon and have a light alarm. Until the operator resets to let him know that something is wrong with the system. Otherwise, if there is a downtime, others will think that there is something wrong with your program, which is usually something to pay attention to when designing a new system.
6. Regarding the frequently called subroutines, they can be made into submodules and called frequently.
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