DeltaProgrammable Logic Controller1features

To adapt to industrial environments, compared to general control devices,Programmable Logic ControllerThe machine has the following features:

1.High reliability, strong anti-interference ability

The reliability requirements for industrial production on control equipment:

①Long Mean Time Between Failures

②Fault repair time (average repair time) is short

Any malfunction of electronic devices usually falls into two categories:

①Spontaneous failure. These are failures caused by adverse external conditions such as electromagnetic interference, extreme temperatures, over- or under-voltage, vibration, etc. As long as these conditions do not cause damage to system components, the system will return to normal once the environmental conditions return to normal. However, for...Programmable Logic ControllerHowever, after being affected by external factors, the internal stored information may be damaged.

②Fault due to irreparable damage to components.

If we can limit the conditions that cause sporadic failures, and if we can makeProgrammable Logic ControllerUnaffected or able to limit the consequences of adverse effects to a small area, makingProgrammable Logic ControllerAfter the adverse conditions disappear, it will automatically return to normal, which can improve the average time between failures; if it can be done in a way thatProgrammable Logic ControllerIncrease some diagnostic measures and appropriate protection measures, when a fault occurs, it can quickly find the point of failure and limit the failure to a local area, which can reduceProgrammable Logic Controller的平均修复时间。为此，各Programmable Logic ControllerThe manufacturer of "has taken a variety of measures in hardware and software to make "Programmable Logic ControllerIn addition to its strong self-diagnosis capabilities, which can provide timely error information and stop running to wait for repair, it also enablesProgrammable Logic ControllerIt has a very strong anti-interference ability.

·Hardware measures:

The main modules are all made of large-scale or ultra-large-scale integrated circuits, and the large number of switch operations are completed by contactless electronic memory.I/OThe system design has a complete channel protection and signal conditioning circuit.

①censor" 或 "block——For the power transformer,CPUThe main components such as the programming tool are shielded with conductive and magnetic materials to prevent external interference.

②滤波——The power supply system and the input lines are equipped with various forms of filtering, such asLiquid CrystalOrπType filter network, to eliminate or suppress high-frequency interference, also weakened the impact of various modules.

③Power Adjustment and Protection——The required core component for the microprocessor+5VThe power supply uses multi-stage filtering and is adjusted by an integrated voltage regulator to accommodate the fluctuations of the AC power grid and the effects of overvoltage and undervoltage.

④Quarantine——In the microprocessor andI/OBetween circuits, photoelectric isolation measures are adopted to effectively isolate.I/OInterface withCPUThe connection between the electricity, reducing the failure and misoperation; eachI/OThe mouths are also isolated from each other.

⑤Adopting a modular structure——This structure helps in short-term repair in the event of a fault. Once a fault is detected in a module, it can be replaced quickly to restore the system to normal operation; it also helps to speed up the process of identifying the cause of the fault.

·Software measures:

It has strong self-checking and protection functions.

①Fault Detection——The software regularly checks the external environment, such as power loss, low voltage, low lithium battery voltage, and strong interference signals, etc., to handle them in time.

②Information Protection and Recovery——When the sporadic fault conditions occur, do not destroy.Programmable Logic ControllerInternal information. Once the fault condition disappears, it can return to normal and continue the original program work. Therefore, Programmable Logic ControllerWhen a fault condition is detected, immediately save the current state into the memory. The software will cooperate to seal the memory, prohibiting any operations on the memory to prevent the stored information from being overwritten.

③Set the alarm clockWatchdog TimerWatchdog——If the program's execution time exceedsWatchdog TimerThe specified time indicates that the program has entered a dead loop, triggering an immediate alarm.

④Strengthen the inspection and validation of the program——Once the program encounters an error, immediately alert and stop execution.

⑤Battery backup for program and dynamic data——After a power outage, using backup batteries to supply power ensures that the status and information will not be lost.

Programmable Logic Controller的出厂试验项目中，有一项就是抗干扰试验。它要求能承受幅值为1000Vrise time1 in SPulse width: 1μS的干扰脉冲。一般，平均故障间隔时间可达几十万～上千万小时；制成系统亦可达4～5Ten thousand hours or even longer.

2.Strong general applicability, variable control programs, convenient to use

Programmable Logic ControllerA variety of hardware devices with complete varieties can be composed to form a control system that meets various requirements, so users do not need to design and manufacture their own hardware devices. Once the hardware is determined, in the case of changes in the production process or the update of production equipment, users do not need to change.Programmable Logic ControllerThe hardware equipment can be met by simply modifying the program. Therefore, Programmable Logic ControllerIn addition to being used for single-machine control, it is also widely employed in factory automation.

3.Highly functional and versatile

ModernProgrammable Logic ControllerNot only has the functions of logical operation, timing, counting, sequence control, but also has the functions of digital and analog input and output, power drive, communication, human-machine dialogue, self-inspection, recording and display. It can not only control a production machine or a production line, but also control a production process.

4.Programming is simple and easy to master.

At present, the majority ofProgrammable Logic ControllerStill using the form of relaying control“Ladder Diagram Programming Method”。It not only inherits the clarity and intuitiveness of traditional control circuits, but also considers the reading habits and programming levels of most factory enterprise electrical technicians, so it is very easy to accept and master. The programming elements of ladder diagram language are very similar to those of relaying control circuit principle diagrams. By reading,Programmable Logic ControllerThe user manual or short-term training provides electrical technicians and technicians with the ability to quickly learn how to create control programs using ladder diagrams. It also offers programming languages such as functional diagrams and instruction lists.

Programmable Logic ControllerWhen executing a ladder diagram program, the program is translated into assembly language by an interpreter and then executed.Programmable Logic ControllerThe internal explanation program has been added. Compared with directly executing user programs written in assembly language, executing ladder diagram programs takes longer, but for most mechanical and electrical control equipment, this is insignificant and completely meets the control requirements.

5.Reduced the design and construction work of the control system.

Due toProgrammable Logic ControllerThe software has been adopted to replace a large number of intermediate relays, time relays, counters, and other devices in the relay control system, significantly reducing the design and installation wiring work for the control cabinet.Programmable Logic ControllerThe user program can be simulated and debugged in the laboratory, which further reduces the amount of debugging work on site. Moreover, due toProgrammable Logic ControllerThe low failure rate and strong monitoring function, as well as modularity, make maintenance extremely convenient.

6.Small volume, light weight, low power consumption, convenient maintenance

Programmable Logic ControllerMicroelectronics technology is applied to industrial equipment products, which have compact, sturdy, small volume, light weight, and low power consumption. Furthermore, due toProgrammable Logic ControllerThe strong anti-interference ability, easy to be installed in the equipment, is the ideal control equipment for the realization of electromechanical integration. With Mitsubishi's "F1-40MTypeProgrammable Logic ControllerFor example: its exterior dimensions are only305×110×110mmWeight2.3kgPower consumption is less than25VAMoreover, it has excellent anti-vibration and adaptability to environmental temperature and humidity changes. Now, Mitsubishi hasFXSeriesProgrammable Logic Controller，与其超小型品种F1Series comparison: area as 47%Volume for36%The system configuration is both fixed and flexible, with input and output capabilities reaching24～128Dot.