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Anonymous users2024-02-10The forward changeover contact is indicated by an ascent command. Once a 0 to 1 conversion is detected in the top of the stack value, the top value of the stack is set to 1; Otherwise, set it to 0. Negative changeover contacts are indicated by a descending command.
Siemens PLC is a programmable controller produced by Siemens in Germany, including LOGO, S7-200, S7-1200, S7-300, S7-400, etc., with the characteristics of small size, fast speed and standardization, PLC can be divided into micro PLC (such as S7-200), small-scale performance requirements of PLC (such as S7-300) and medium and high performance requirements of PLC (such as S7-400) and so on. PLC uses ladder diagrams, Boolean mnemonics, function table diagrams, function modules and statements to describe the programming language, which does not require a large number of moving components and wiring electronic components, simple programming, high ease of operation, automatic diagnosis, easy maintenance.
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Anonymous users2024-02-09You're not positive or negative.
P is a positive differential pulse, that is to say, in a scanning cycle of the PLC, a digital switch in front of P is turned on at the moment when the switch is turned on, and the differential switch is turned on for a scanning cycle.
n is a negative differential pulse, that is to say, in a scanning cycle of the PLC, a digital switch in front of P is switched on at the moment when the switch is turned off, and the differential switch is turned on for a scanning cycle.
The previous switch and p are a whole, and the same is true for n.
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Anonymous users2024-02-08Since it's installed, it's not a problem with the operating system.
Either your software doesn't support Chinese (
Either it's a problem with your setup.
If it's step7microwin, then.
tools option general language Chinese.
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Anonymous users2024-02-07p, the front contact is from open to closed, then |p|Turn on, the action behind it.
n, the front contact from closed to disconnected, then |n|Turn on, the action behind it.
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Anonymous users2024-02-06Rising and falling edges. P: It works when you just press the button when you press it.
n: Valid when you release the button.
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Anonymous users2024-02-05Program Diagram:
Wherein is a forward button, a reverse button, a stop button; Connect two AC contactors KM1 and KM2 for PLC output to control the forward and reverse rotation of the motor.
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Anonymous users2024-02-04Check this out? If you don't understand, you can ask, and I'm very happy to help you!
ps: Leng Jun is a pit goods.
The problem you encounter now is something I have experienced when I used to study on my own, I used to buy a ** of technical success, I can only read it for a year, and I bought a lot of books, and I look at it Sometimes I doze off, sometimes I encounter a problem, although I have a friend who is an engineer and can occasionally answer it, but it is not good to trouble people often, and then I don't want to learn when I learn to learn, and there was no equipment practice at that time, and I didn't learn again for several months, and then it was a colleague of mine, who used to be an electrician together, He learned from Bojun PLC, at that time his monthly salary was more than nine k, and then I also went to study, and now I am also an engineer, and I also take on some projects in my spare time, which is not bad.
Siemens PLC transmission instructions are mainly divided into two categories, one is single transmission, and the other is block transmission >>>More
These two are mainstream PLCs, one made in Japan, one made in Germany, I have used both, both are very representative, it is recommended to learn both, you can learn Mitsubishi's first, because most of the programming methods of other brands of PLC are imitation of Mitsubishi, especially domestic brands, just like the Delta I use now, and Xinjie, which is almost exactly the same as Mitsubishi. Mitsubishi is what a traditional ladder looks like. And Siemens is also unique, although he also said that it is a ladder diagram, but his is a modular ladder diagram, which looks more intuitive than Mitsubishi's, and the step7 software is also very easy to use. >>>More
PLC did not delve into it, did not understand.
Siemens PLC
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