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  Python and PLC Communication

This article provides detailed steps on how to use Python to communicate with Schneider M221 and Siemens S7-1200 PLCs via Ethernet. Additionally, we offer a packaged Python PLC client library, enabling you to easily build your own SCADA control programs, such as Human-Machine Interfaces (HMI). The system overview is shown below: To check the project detail please refer to Python Physical PLC Communication Clients # Created: 2024/06/29 # Version: v0.1.3 # Copyright: Copyright (c) 2024 ...

   PYTHON,PLC,COMMUNICATION     2024-06-30 02:21:17

  Be Aware of these 10 mistakes while designing Your Mobile App!

So you have finally decided to enter the world of technology and you are going to design an application for your business. The time has become when you have to give all the nitty-gitty grins a look and design your own mobile app for promoting your business online. Well when you have finally decided to design your mobile application, here are some mistakes that you are not allowed to make. Have a look:   Do Not Start Designing Your App Without Wireframes Normal 0 false ...

       2014-12-11 02:12:02

  Output a file with HTTP range header in PHP

When downloading a large file, we may encounter some network issues which causes download termination and only part of the file is downloaded. When the network connection resumes next time, we may need to redownload the file again from the beginning. In order to save bandwidth, http provides a Range parameter in its header which can control the file transfer flow. With the range parameter in the header, we can resume the download from where we stop. Here is a piece of PHP code snippet which uses...

   PHP, range,http, file transfer     2013-01-09 05:55:05

  ConcurrentHashMap vs Collections.synchronizedMap()

ConcurrentHashMap and Collections.synchronizedMap() both provide thread-safe operations of collections of data. They are used in multithreaded programs to provide both thread safety and performance improvements. In many cases, we can use either of them. But the realization of thread safety is different for these two implementations. ConcurrentHashMap will create an HashEntry[] array internally to store the elements passed in from a Map, while Collections.synchronizedMap() will return a Synchroni...

   ConcurrentHashMap,Collections.synchronizedMap     2014-09-18 05:04:59

  Big Corporate Layoffs Hit Shenzhen IT Manufacturing Business

At 11:00 on March 29, 3 employees were ready to jump from Shenzhen Foxconn's longhua building G14. According to witnesses, those 3 employees were negotiating with company regarding the “Foxconn diversion plan”. Liu Kun, Foxconn public speaker, told reporters that many employees are working negatively to resist this plan, but Foxconn does not agree or support their actions in this way. " Company like Foxconn with large-scale labor-intensive manufacturing enterprises in Shenzhen, is f...

   Layoff,Career,China     2013-04-01 06:44:43

  Tips for a better first-time hackathon experience

Here are a few things you can consider. These are by no means the only way to go about hackathons, just what's worked for me.ProjectI strongly strongly recommend doing something you haven't done before. Even if you're going into a hackathon with the intention of winning, trying something new is always fun and will keep you engaged throughout the event. Jump into mobile development, try hardware hacking, write a compiler, whatever; it's always fun to try out new things.Sticking to things you're c...

   hackathon     2014-03-31 07:25:09

  Why cannot compare double values directly for equality?

A question in PHP: Get some value from the database and use floatval() to convert it to floatint point value, then compare it with another value which is also converted to floating point value with floatval(). These two values are the same when using var_dump() to output, the two outputs are float(8.87), they are the same. But when comparing them for equality, the result is weird., they are not equal. Why?To analyze this question, we need to start with PHP data types. PHP uses weak types. In PHP...

   PHP,floating, precision,compare,equality     2012-06-27 09:01:36

  Google Allo - Changing the way people chat

Google released a new smart messaging application a couple of weeks ago -- Google Allo. At first glance, it has no much difference than other mature messaging applications on the market such as What's App, Line, WeChat. It has a concise and easy to use user interface and comes with stickers, doodles, and HUGE emojis & text. But do we really need a new messaging application which is similar to others in most aspects? The answer is MAYBE. From its description, it claims it's a SMAR...

   GOOGLE,AI,GOOGLE ALLO,GOOGLE ASSISTANT     2016-10-03 09:44:51

  Failed merge and acquisition cases in the Internet history

Bebo founder sold Bebo with 850 million US dollars in 2008, but later he bought it back with just 1 million US dollars. This news lets us think about those failed merge and acquisition cases in Internet history. Let's summarize some of them here. 1. Bebo Buyer : AOL Acquisition price : 650 million US dollars Sold price : 1 million US dollars Loss: 849 million US dollars In 2008, AOL was still belong to Time Warner. It made a decision to acquire the third largest social networking site Bebo, The...

   Merge and acquisition,Loss,MySpace     2013-07-03 08:37:13

  The magic of go:linkname

When writing Go program, there is frequent need on using time.Sleep() function to pause the logic for some time. And if jumping to the definition of this function, can see below definition: // Sleep pauses the current goroutine for at least the duration d. // A negative or zero duration causes Sleep to return immediately. func Sleep(d Duration) I's strange that there is no function body defined here. What happened? The actual definition of the function body is residing at runtime/time.go&nb...

   TRICKS,GO:LINKNAME,GOLANG     2022-04-10 08:39:00

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