Reason thermostat module

In recent years, the rapid development of computer technology has been widely applied in all walks of life. However, with the corresponding traditional industrial module plc development cycle is long, repeated use is low, the price is high, difficult to modify and other shortcomings. As more and more automation equipment has been applied, it is for industrial control software is also rising, the traditional industrial control software has been unable to meet user requirements. How convenient use of the software to design flexible and efficient plc temperature module system has become a very important issue.

In the PLC, CPU module, I / O modules, namely what role

CPU module is the control center of the PLC. It functions in accordance with the procedures given PLC system receives and stores from the programmer type of user programs and data; check the power supply, memory, I / O and watchdog timer status, and diagnose user program syntax error. plc IO module is the interface between PLC and site control interface input channels. Therefore, the manufacturer of the PLC power supply design and manufacturing very seriously. Programming plays a role in the design and commissioning of the plc.

Advantages PLC NA series

NA Series Programmable Logic Controller (NA Series PLC) is a new generation controlling device developed with international advanced level. programmable intelligent controller adopts a series of latest achievements in the field of industrial controlling, selects a brand-new hardware and software platform, so it has fast processing capacity, strong anti-jamming performance, flexible extensible function, and plc module could cope with any complex environment and processing requirements easily and skillfully. NA Series PLC has got CE Certification and FCC Certification, various performance indexes have reached or exceeded relevant standards and are ahead of similar products.

further improve the reliability of the PLC

n order to further improve the reliability of the PLC, for large-scale PLC also uses dual-cpu module constitute a redundant system, or the use of three CPU of voting systems. Thus, even if a cpu modules plc fails, the whole system is still running.
CPU speed and memory capacity are important parameters for PLC, which determines the operating speed of the PLC, I / O number and software capacity, etc., thereby limiting the size of the control.

PlC of cpu module

plc cpu modules is the control center PLC is the core of the PLC from the nerve center of the action, each PLC has at least one CPU. It functions in accordance with the procedures given PLC system receives and stores from the programmer type of user programs and data; check the power supply, memory, I / O and watchdog timer status, and diagnose user program syntax error. When the PLC into operation, the first of its way to scan each site receiving state and data input device, and are stored in the I / O image area, then one by one to read the user program from the user program memory, after the command interpreter Press the results of the implementation of the provisions of the instruction of a logical or arithmetic fed into the I / O image area or a data register. And so after all of the user program is finished, the final transfer of data I / O image area of each output state or output register to the appropriate output device, so the cycle run until it stops running.

What is the definition of PLC, programmable logic controller

Programmable logic controller, said the English Programmable Controller, called PC. However, due to the personal computer PC is easy and (Personal Computer) confused, so people are still accustomed to using plc communication modules as an abbreviation. Electronic digital computing device operating system, it is a microprocessor core, specifically designed for applications in the industrial field, for it uses programmable memory for storage in its internal implementation of logical, sequential control, timer / counting and arithmetic operations such as operating instructions, and digital or analog input through output interface, control of all types of machinery or production processes. PLC is the product of computer technology with traditional relay contactor control technology, which overcomes the wiring relay contactor control system complex mechanical contact, low reliability, high power, versatility and flexibility shortcomings of the poor, full advantage of the microprocessor, and take care of operation and maintenance personnel to the site electrical skills and habits, especially PLC programming does not require specialized knowledge of computer programming languages, but with a set of relay ladder based simple instruction form, so that the image of the user programming, intuitive and easy to learn; debugging and troubleshooting is also very convenient. After the user to purchase the desired PLC, just follow the prompts manual, do a small amount of wiring and easy user programming work, it can flexibly and easily be applied to production practice PLC.

Programmable Logic Controller (PLC) features

Industrial control equipment reliability requirements:
① MTBF long time
② time to repair (MTTR) Short
Any failure electronic devices, usually two:
① sporadic fault. Due to the harsh external environment, such as electromagnetic interference, ultra-high temperature, ultra-low temperature, over voltage, under voltage failure caused by vibration and so on. Such failures, they do not cause damage to system components, once the environmental conditions return to normal, the system also will return to normal. But for PLC, the rear outside influence, the information stored inside may be damaged.
② permanent failure. Since the components can not be restored and the destruction caused by the fault.
If we can limit the occurrence of sporadic fault condition, the consequences will not be affected if the PLC or able to make impact in harsh environments is limited to a minimum, make programmable logic controller (plc) suppliers automatically disappear after the harsh conditions return to normal, so that we can improve MTBF time; if we can increase the number of diagnostic measures and appropriate means of protection in the PLC, when a permanent failure, can quickly find the point of failure and faults locally, can reduce mean time to repair the PLC. To this end, each PLC manufacturer has taken various measures in terms of hardware and software, so that PLC in addition to their strong self-diagnostic capabilities, in time with an error message, stop waiting for repair, but also make the PLC has a very strong anti-jamming capability.