(Note: Not looking for trouble, purely technical discussion)
Disadvantages:
1, the price is high, compared with PLC.
2, low reliability, this need not be argued, it has been argued many times, and it is related to the architecture.
3, the volume is large
4. The analog processing accuracy and anti-interference ability are low, which is related to the internal structure and interface.
5. The anti-interference ability of the system is weak, because its internal frequency is too high, and the system is developed for business and cannot withstand interference.
6, the temperature rise is large, as the landlord said, it is not easy to achieve 55 degrees, and it is difficult to go up again, because the temperature rise of the CPU itself is very high, and the ambient temperature can easily reach the junction temperature of the semiconductor.
7. The scalability is very weak, unless, of course, the structure is completely modularized.
8. Most of the CPU used in 8.PAC is around 386-P3, while most of the CPU used in 586 has been discontinued, and only some industrial X86 SOC can be used, which is expensive and difficult to supply. Peripheral DRAM is only second-hand, and most interface chips have been discontinued, so long-term supply cannot be guaranteed. This has something to do with the rapid upgrading of computers. If you buy PAC, you may not have the same accessories in two years, and the new accessories may not be compatible.
9. The time interval of operation is generally unstable, and it is difficult to complete some places with high requirements for reliability and stability.
Advantages:
1, there are many resources, which can be used with PC resources to make development simple.
2. Strong computing ability, but it needs to be linked with language. If you use T-diagram, users must add their own interfaces with C, C++ and VB. Unfortunately, the reliability will be affected after opening this interface.
3, network, video, numerical control can have a good support, can be supported by powerful computing power.
4. Powerful CPU and display library can combine control and monitoring and provide support.
5. New products are opaque and have high profit rate, which can give manufacturers and agents better profits.
In fact, PAC is not new. Soft PLC with PC_BASE structure is actually packaged. Many industrial manufacturers have this kind of thing. Everyone uses the software of KW, One echelon, ISAGRAF, 3S and other companies. Now everyone has packaged this thing, re-established a concept and challenged the traditional controller company with the concept. I don't quite agree with this practice because it is easy to be misunderstood. After a long time, if everyone knows, it will damage the industry.
Too many friends want V80 small PLC programming software.
VLadder5. 10 new version (control whatever you want)
Features of the new software:
1, free control:
Online programming can be programmed and debugged at will in the running state, thus realizing free control.
B, powerful real-time online monitoring function, users can monitor any variable through online monitoring function, so that everything is under control.
In the middle. (All monitoring status and information are taken from the lower PLC, not analog, so they are real-time status and information. )
What you think is what you get:
A friendly programming environment, which can be copied and edited at will.
B, support the cancellation and repetition of any step,
C, support powerful search and replacement, make your programming project relaxed and happy;
3. Powerful features beyond your expectations:
A, a powerful instruction system conforming to IEC6 1 13 1, including 140 kinds of powerful functional blocks and fingers carefully built by Davidson automation experts.
Make, better than similar product function block performance, easier to use;
B. VLadder5. 10 is a programming software specially tailored for V80 small PLC, which fully displays the hard PLC characteristics of V80.
All systems using V80 will get the reliability guarantee from the kernel. (V80 adopts the latest generation of hard problem solving chip technology, full logic operation.
No CPU is required to participate, thus achieving the highest reliability and stability)
4. Complete help system:
After installing Vlader version 5. 10 software, all hardware manuals, software manuals, instruction manuals, application guides and application cases have been installed.
Installed on your computer, you can easily find this information in the start menu.
5. Personal service system:
24-hour hotline technical support service, Devison automation experts provide you with comprehensive technical services.
The new version of this software is completely free to use. Please download from Devison's website:
/products/27.jsp
Other software vendors don't even admit that the software they sell you is PAC software, not PLC software!
80% PLC has the function you said, which is not the reason to prove that it is PAC!
Xie Gong is right. You can call your product whatever you want. I have no right to interfere, so after the quarrel, you can call them whatever you like.
As for the debate about who is PAC and who is not, it's really boring and I'm too lazy to go back. If you have time this afternoon, I will write my personal views on the future development of controllers. Remember to criticize after reading it!
Blog and podcast quotes are added as friends to send messages to reply to Laochaifu14th floor. Reply time: May, 2006-1011:58: 00.
I am looking forward to it ...
Blog podcast quotation plus sending a message to reply to KDS15th floor as a friend. Reply time: May 2006-1013: 40: 00.
Backward PLC manufacturers hype the concept! Playing around, in fact, everyone is similar.
Blog and podcast quotes are added as friends to send messages to reply to Wang Shenglei16th floor. Reply time: May 2006-1021:21:00.
I wrote one: please have a look and discuss, hehehe, not afraid of being beaten!
/detail.asp？ id=328768
At the domestic PLC forum
Blog and podcast quotes are added as friends to send messages to reply to the Oriental Sword17th floor. Reply time: June 6, 2006 at 20: 39.
It was because I couldn't get the real PLC that I fired the concept of PAC. What was the concept of APC (Advanced Programmable Controller) that day? The functions of APC include PAC and PLC, and adopt dual CPU system. One CPU is responsible for running the control program of PLC, and the other CPU is responsible for communication, file management, interface display, etc. , which can give consideration to reliability, stability and universality. In this way, the concept of PAC is out of date.
Wang Shenglei, how about we fry together? I think you're having a hard time alone. You don't have enough saliva! We also listed 20 advantages of APC and 20 disadvantages of PAC. Will we lose a market analyst?
Blog and podcast quotation and send a message to reply to Gary Lin18th floor as a friend. Reply time: June 9, 2006 13: 53: 00.
Total records 10 1 total pages 3 Current pages 1
References:
China industrial control network
(Baidu: Your answer exceeds 10000 words, please delete it) (deleted)
(All three pages, hi contact)