mqtt plc

For an electrical engineer, a wide range of cables and data lines, or the replacement of Wear-Resistant towlines, is a cumbersome task, but also the high cost of laying, installation and maintenance should be considered. The dtd110 wireless transmitter simplifies device installation, reduces maintenance time and downtime, increases system availability, and improves productivity. I,In industrial applications, the use of wireless transmission technology for data and signal transmission can meet

During this period of time, I have been working on Industrial Automatic Control Projects. PLC Used Siemens. At that time, the host computer used Siemens WinCC, which was a nondescribable C, it makes me really intolerable. Without event-driven, it cannot be called modern software. After several days of diving on the Siemens BBS and a waste of water with engineers in Beijing, I finally found the future direction of self-control software application, OPC

Recently made a Apollo to achieve MQTT and mobile phone side of the push, summed up the experience, Apollo is an open source Mqtt proxy Server in Apache with the following address http://activemq.apache.org/apollo/ 1. Configure the environment, download the installation Java environment required, then download Apollo 2. Easy to run 2.1 After the download is complete unpack, create broker, in fact the prox

From: Http://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levelsQuality of Servicewhat is quality of Service?The quality of Service (QoS) level was an agreement between sender and receiver of a message regarding the Guarant Ees of delivering a message. There is 3 QoS levels in MQTT: At the most once (0) At least once (1) exa

equipment to adjust.2. System compositionFigure 2-1 System compositionThe system is composed of PC (including test software), test instrument, test sensor, PLC control module, sweep code gun and switch circuit. which(1) PC: running motor testing software;? Through the RS232 port: with the test instruments and other peripheral devices such as scanning gun to carry out instruction interaction, so as to achieve the control of peripheral devices and meas

MVS-8100D in one PC when more than 3 cameras are neededImage Acquisition Card. The CDC series cameras are half the weight and volume of normal digital cameras and are suitable for a variety of mounting structures, including: robot arm and otherMachine VisionSystemX-Y platform. In harsh application environments, the robust Housing provides protection. It has 9-Pin Micro-cable connector. It has optional built-in Optical Isolation trigger and access connector, without other connection modules.

this period of time ...... You can write a diary if you cannot write a technical blog. If I spent more than two months in a wire assembly plant in Wuhu Chery before graduation, I am only familiar with my future work, after graduation, I came to Qingdao Faw Jiefang new factory to create a project, which was my first project. When I first came, I felt a little idle. I sat in the center control room of the painted glass room every day, smell the pungent paint, and write the configuration part of

may not be available. And things like those out there might be built in.With the above constraints, I finally gave up the plan, but I would like to use another article to describe in detail the framework of C2DM and the corresponding settings of the client and app server, can be used as a learning resource to let us have a reference material. If C2DM does not meet our requirements, then we need to implement the communication protocol between the Android phone client and the app server to ensure

, especially in China, and remove native services such as Google. If you have bought some hosts such as a cottage or Huawei, Google's services may be unavailable. For example, those who go abroad may be built in. With these constraints, I finally gave up this solution, however, I want to use another article to introduce the C2DM framework in detail and the corresponding setting methods of the client and App Server, which can be used as a learning resource for reference. As C2DM cannot meet our

machine, Google's services may not be available. And things like those out there might be built in.With the above constraints, I finally gave up the plan, but I would like to use another article to describe in detail the framework of C2DM and the corresponding settings of the client and app server, can be used as a learning resource to let us have a reference material. If C2DM does not meet our requirements, then we need to implement the communication protocol between the Android phone client a

Internet of Things agreement: Protocol Coap Xmpp RESTful HTTP Mqtt Transport Udp Tcp Tcp Tcp Messaging Request/response Publish/subscribe Request/response Request/response Publish/subscribe Request/response 2G, 3G, 4G suitability (1000s nodes) Excellent Excellent Excellent Excellent Lln suitability (1000s nodes) Excellent

and API description of the component refer to: http://www.cnblogs.com/dathlin/p/7703805.html component usage limits, update logs, all within this page.Why connection pooling is requiredFirst of all, we need to solve this problem, why we need to connect pool, the ultimate goal is to efficient data access, but not all the circumstances need to connect pool building, to mention a few?? ItCase one: You have a background thread every 1s clock reading the data of the

switching volume, such as whether the Reading Display board has a button press, water flow switch state. 0x03: read one or more hold registers, such as reading one or more setting parameters 0x010: Write one or more hold registers, such as write set parameters 0x06: Write a single hold register, such as write a single set parameter 0x04: read one or more input registers, such as reading specific key values, ad-collected information, etc. Modbus protocol function codes and FAQs Pasted from

is 4 times, error = 0 is the number of communication errors, 0 times in the figure, ID = 1 indicates the device address of the analog Modbus sub-device, the address in the figure is 1;f = 03 means the Modbus function code used, the figure is 03 function code; SR = 1000ms indicates the scan cycle. The Scarlet Letter section, which indicates the current error state, "No Connection" indicates the disconnected state.3), Parameter settings:In the menu "Setup", click "Read/write Definition. F8 "param

In the industrial field by the PLC remote control inverter application is very common, if the trench wiring inconvenience or frequency converter on the mobile device, then the use of wireless communication is the best solution.　　　The benefits of this program are: No operating costs, no card, autonomous group network, distance, can pass through obstacles, bypassing the barrier, wireless transmission distance of more than 3 kilometers.　　　Here we use Sie

Four, MQTT MQTT (Messages Queuing telemetry transport, Message Queuing telemetry transmission) is an Instant Messaging protocol developed by IBM, a lightweight agent-based publish/Subscribe message Transfer Protocol that can be connected through very little code and bandwidth and remote devices. For example, through satellite and proxy connections, through dial-up and health care provider connectivity, as w

Received transaction processing type-> TRANSACTION_TYPE SQL: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Select plc. lookup_code, Plc. lookup_type, Plc. displayed_field, Plc. description, Plc. enabled_flag from po_lookup

enterprises, there are small businesses, the perfect solution to each MES project data acquisition problem, the solution of these problems benefited from my years engaged in embedded software development, multi-port Communication server development, large-scale PLC control system development, intelligent control terminal development, etc. So summarizes the following points about data acquisition aspects of the implementation method: First, the

I haven't come to the blog Garden in a few days. Recently I started a new project and got in touch with some rolling mill items. I feel that the rolling machinery and electrical aspects are too weak in China and I have always wanted to be in the garden. Look for garden friends who are engaged in the steel industry and hope to discuss some automation knowledge with each other. The items used in steel rolling are too abnormal. The VME framework is motionless, And the 64-bit data is motionless.

message to the server and synchronizes the message as soon as the server changes.2) SMS (Push) mode: To understand the server's commands by intercepting SMS messages and parsing the contents of the message, but this way the average user is financially hard to bear.3) Persistent connection (Push): A long-term connection is established between the client and the server, which enables the timely and real-time delivery of messages.III. Overview of Message push solutionsA, C2DM cloud Push solutionGo