PLC program writing problems, PLC program writing help

This is a simple program controlled by a single button, you will ask such a question, indicating that you do not understand the timing analysis of the PLC enough, look at this example, first the external driver, closing, in the input image register to collect the closure, and then enter the program scanning stage, the scanning mode of the PLC should be known! Top-to-bottom, left-to-right, linear cyclic scanning. Then because of the closure of the scan, the first network can flow on, through, through the rising edge command, turn on the coil for a cycle of scanning time, that is to say, after scanning the self-locking contact, the coil loses power.

Then when the point is obtained, its normally open contact is closed, and when it is scanned, it will scan that the second network is not conductive because of the disconnection of the normally open contact, and the same reason can be proved, the third network is conducted, then the coil is electrified, resulting in the closure of the normally open contact, so it is self-locking! The process of power loss is analyzed using the same analytical method!!

It is important to remember the state of the coil in time series analysis...

Recently, there has been a shortage of points, you give me the points first, I'm telling you the back! I'm sorry, I'm treacherous!

According to my analysis:

This app is part of a button (control start, stop.

Before there is no output, the first time it locks on time, it will not engage because it is triggered by the rising delay.

When you press the button again, it outputs.

The moving edge triggers the output, turns on the output, turns on the output, turns on, and the normally closed point is disconnected and disconnected. This is only a momentary action, that is, the rising edge of a cycle can be triggered without self-locking.

Take a good look at the concept of scan cycles.

This is the basic requirement, if you can't do this, then you may not be able to get started, you can try to see the logic control, and the use of time relays, this function can be achieved in many ways.

Being able to do some simple cylinder action control means that you have a certain understanding of PLC, and you have a foundation for doing some switching control. The next thing is to learn more complex sequence control, you can do some sequence start, production line process equipment control, in the later you can learn some analog control programming, in the later to learn some networking engineering, servo control is not too complicated, as long as you understand the information required by the servo controller, through the PLC to give it it.

Supplement upstairs, PLC in the process of running the program is easy to cause external hardware mechanical jamming and other fault phenomena, so the previous experience must be listened to!

It should be debug mode! I don't know what brand of PLC you use. If you really only have two options, select "STOP" mode.

During the PLC run process, the program is easy to cause faults such as mechanical jamming of external hardware.

The programmer is a tool for writing data to programmable integrated circuits, and the programmer is mainly used for programming (or flashing) chips such as single-chip microcomputers (including embedded) memory (including BIOS). The programmer mainly modifies the program in the read-only memory, and the programmer is usually connected to the computer and used in conjunction with the programming software.

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