1. When the PLC and the host computer (or touch screen) form a monitoring system, there are many hours on the screen that require "manual", "active" and other control forms (generally more than one). In the program, you can use the "MOV" command. For example, when selecting "manual", the constant 1 MOV will be placed in a register VB10, and when "active" will be selected, 2 MOV will be placed in the same register VB10. The advantage of this line of thinking is that it is easy to understand, and there is no need for troublesome 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 conditions are satisfactory in the program sentence and the output coil is not connected, you can check whether your program is between such sentences, such as JUMPgo to 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 section 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 sequence control, using +10+10 control form, I think it is very convenient. The idea is: preset a register, the value is 0 at the initialization time, when the system is started, +10 to it, the register is 10, the register is equal to 10, and the first action can be made; After the first action is completed, then the register is +10.At this moment, the register is equal to 20.The second action can be done, and after the second action is completed, it is +10.The register is equal to 30.So you only need to determine how much data is in the register, and you will know that the action is to be completed. When the demand beats the action, it can no longer be +10.can add +20+30...., depending on the needs of the practice.
Why add 10 instead of 1, because after adding 10, if you pierce a section, you only need to pick a random position among the 10 free places.
5. At the time of the planning procedure, when there is a problem in the process (non-control system control), it is best to keep the fault phenomenon and have a light sound alarm. Until the operator resets to let him know that something is wrong with the system. Otherwise, it's downtime, and others will think that your program is a problem. It is generally important to pay attention to these when planning a new system.
6. For frequently called subroutines, they can be made into sub-modules and frequently called.
7. Because the production machinery in the work cycle of each step movement in the execution of the demand for a certain moment, and these moments have a certain limit, so can be used as a reference to these moments, at the same time that the step action to be detected begins, start a timer, the time setting value of the timer is 20%-30% longer than the time when the action is to continue under normal circumstances, and the output signal of the timer can be used for alarm or active shutdown equipment. When the time of a certain step action of the production machinery exceeds the regular time, reaches the corresponding timer preset time, and has not yet transferred to the next step action, the timer announces the fault signal, the signal aborts the normal work cycle program, start alarm or shutdown program, which is what we often call ultra-beat protection.
8. Some safety detection switches (such as emergency stop buttons, safety light curtains, limit switches, etc.) are practical normally closed (NC) input.
9. For the sake of safety and energy saving, try to plan the output to act when the demand is in place, and stop the output once it is in place, instead of planning to output all the time, and let the output be disconnected when the demand is suspended.
10. The action criterion of the actuator should be to rather not move than to move!
11. Single equipment control: It is necessary for a single device to have soft hand operation/active switching and soft hand operation to start/stop function, and the equipment cannot be stopped when switching from active to soft hand operation; When switching from soft hand operation to active, the device start/stop depends on the active program.
12. It is necessary to rotate a single equipment (pump, fan and other large equipment) after 24 hours of operation, and it is necessary to accumulate the operation time.
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