PLC wireless communication is equipped with wireless communication system PLC (PLC is also called programmable logic control board). It is in the traditional PLC characteristics and features on the basis of the remote control measurement and control technology stemming from the enhancement: hardware configuration in addition to the traditional PLC with the input collection, automotive relay manipulation, timers and serial communications and other roles, but also enhance the role of GPRS, short messages and wireless digital radio communication, in addition to the APP with the traditional PLC with the reading of inputs, the implementation of the program process, the resolution of communication requirements, the implementation of the CPU self-confirmation and write the export of the five scanning cycle time process. In addition to reading input, executing program flow, solving communication requirements, executing CPU self-checking, and writing and exporting these five scanning cycle time processes, APP also enhances the role of remote control collection management methods such as wireless channel management methods, driver management, collection management methods, and program management. The major advantage of PLC wireless communication compared with traditional PLC is that remote control measurement and control technology programs such as remote control measurement system, remote monitoring system and remote control alarm equipment can be built immediately without external wireless communication module and writing socket driver software.
The PLC wireless communication has been upgraded with components such as SIM card holder and wireless antenna socket for wireless communication in addition to the same basic appearance as that of conventional PLC such as terminal block, display lamp, and serial communication socket (expansion socket). In addition to the same internal structure as conventional PLCs, such as circuitry, serial communication, IO input detection, IO output manipulation, user program storage, and CPU module, plc wireless communication also upgrades the structure of microwave radio frequency blocks related to wireless communication.
Principle of operation
The cyclic system coding sequence in which the CPU continuously executes user programs and daily tasks is called scanning.The scanning cycle time of the CPU contains reading inputs, executing program flow, resolving communication requirements, performing CPU self-confirmation detection, writing export, and collecting management methods.PLC wireless communication can be regarded as a kind of scanning machine device under the application of the operating system. It has been cyclically scanning the system and performing the daily tasks required by the operating system. The user program is only one component of the scanning cycle time, and in time, without writing the user program, the PLC wireless communication also performs cyclic scanning of the system, except that the user program performs this part of the execution in one cycle time and completes the execution immediately. The PLC wireless communication completes all six scans in one cycle time. the PLC wireless communication control module end device!
Execution of CPU self-confirmation detection
In order to ensure the stability of the facility and to immediately reflect the common faults that arise, the PLC wireless communication has a self-monitoring role. The self-monitoring role is carried out crucially by the time monitor (WDT, Watchdog 1). Watchdog 1 is a hardware-configured timer that is calibrated (reinstalled) before each scan cycle time gradual. The Watchdog 1 has a fixed calibration value of 3000ms. When the scan cycle time of one of the daily tasks exceeds this calibration value, the PLC wireless communication feels that there is a malfunction in the machine and carries out the corresponding common troubleshooting (restarting the PLC wireless communication, common troubleshooting log, etc.).
Resolving Communication Requirements
In the communication solution section of the scanning cycle time, the CPU will solve the daily task of the relevant wireless channel, and this whole process is used for communication between the PLC and between the PLC and the upper computer software computer or intelligent terminal. Solve the collection of management methods plc wireless communication with the traditional PLC is a big difference is that you can immediately build remote control measurement and control technology (alarm) system software, a set of perfect and smooth remote control automatic control system, at least with the PLC or sub-station intelligent terminal in the middle of the collection of the role of the role of the host computer software with the main network communication interaction with the role of the data and information request timeout and then send the role of the crc8 Has when a communication wireless channel pushes the common faults full automatic change to other communication wireless channel role.
PLC wireless communication in the normal operation of the situation, each scanning cycle time includes a solution to collect the management method of this whole process. Even if everything is not written in the user's program, it does not jeopardize plc wireless communication into a DTU machine device in a remote control automation system.
Read input, write export
When the CPU solves a user program, the input values applied are not immediately loaded from the physics input points, and none of the results of the calculations are immediately sent to the specific physics export points; instead, 2 projection registers (system variables) are installed in the runtime memory: one for the input projection register, and in addition, one for the export projection register. Commonly used input values in the user program are the values in the input registers, and the results of the calculations are also placed in the export registers. During the whole process of input scanning, the CPU locks the specific input point into the input projection register; during the whole process of export scanning, the CPU locks the value of the export projection register into the specific physics export point. plc wireless communication control module terminal equipment!
In the learning input link, the CPU scans each input terminal and locks each input point into the input projection register according to the input power circuit, and when it turns to the user program execution link, the CPU scans each sentence (command) in accordance with the order of precedence, executes the user program according to the situation of the input projection register and the export projection register, and at the same time, loads the result of the execution into the export projection register. At the same time, the result of execution is loaded into the exported projection register. During the user program execution period, the information in the input condition register remains the same even if the condition of the input terminals changes (the input condition change can be centralized and input only at the input session of the cycle time in the next job). During the write export session, the situation of the export shadow register is transferred to the export terminals according to the export power circuit.
Execution of user program
The customer's program flow is divided into three parts for the better, each of which is the dominant program flow, the thing program flow, and the program segment. In the Execute User Program segment of the scan cycle time, the CPU executes the customer's subroutine from start to finish. The thing program flow is not executed as part of the normal scan cycle time of everything, instead it is executed when things are generated. Program segments are executed when they are read.
Ltd. specializes in high-precision GNSS modules and wireless communication products, technology development and application promotion service providers, relying on the wireless communication technology in the field of research and development and promotion of experience, Junoda established a rich experience in hardware and software development of the technical team, aimed at domestic and foreign OEM / ODM customers and system integrators to provide high-quality, high-performance wireless module and application We aim to provide high-quality, high-performance wireless modules and application programs to OEM/ODM customers and system integrators at home and abroad, and create long-term value for customers!
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In the field of wireless communication products, the company follows the latest development of international communication technology, introduces and acts as an agent for wireless communication modules that meet the market demand, and the products have a comprehensive layout from 2G, 3G, 4G, and are widely used in financial electronic payment, vehicle remote control, remote advertising information, repeater monitoring, mobile Internet terminals, smart home, remote medical care, network testing, enterprise information management, anti-theft alarm, Remote video transmission, intelligent meter reading, mobile computing, network navigation, voice phone, wireless gateway and other fields. Focus areas include video surveillance, network optimization, routers, POS and other M2M industry applications.
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