Product details

• Catalog Description:
• Memory Board
• Test and Inspection Memory Board, Dynamic

Memory is a memory device used to store information in modern information technology. Its concept is very broad, there are many levels, in the digital system, as long as can save binary data can be memory; In the integrated circuit, a circuit with storage function without physical form is also called memory, such as RAM, FIFO, etc. In the system, the storage device with physical form is also called memory, such as memory strips, TF cards, etc. All information in a computer, including raw input data, computer programs, intermediate and final results, is stored in memory. It stores and retrieves information according to the location specified by the controller. With memory, the computer has memory function, in order to ensure normal work. The memory in the computer can be divided into main memory (memory) and auxiliary memory (external memory) according to the purpose of the memory, and there are also classification methods into external memory and internal memory. External storage is usually magnetic media or optical discs, which can store information for a long time. Memory refers to the storage component on the mainboard. It is used to store the data and programs that are currently running. However, it is only used to store the programs and data temporarily.

PLC and DCS system in common

①DCS: Distributed control systems (distributedcontrol systems).

PLC: Programmable Logic Controller (PLC). Both have different emphasis and are advanced.

②DCS focuses more on the process control field (such as chemical, smelting, pharmaceutical, etc.) is mainly the monitoring and adjustment control of some field parameters, while PLC focuses on logic control (machining class). Of course, the current PLC can also deal with process control problems well, but there is no DCS professional.

(3) If the simulation quantity is greater than 100 points, DCS is generally used; If the analog quantity is within 100 points, PLC is generally used.

DCS is a "distributed control system", and PLC is just a control "device", the two are the difference between "system" and "device". The system can realize the functions and coordination of any device, and the PLC device only realizes the functions of this unit.

The DCS network is the central nervous system of the whole system, DCS system usually uses the international standard protocol TCP/IP. It is a safe and reliable double redundancy high-speed communication network, the system is more extensible and open. Because the PLC basically works for a single small system, when communicating with other PLC or host computer, the network form used is basically a single network structure, and the network protocol is often inconsistent with international standards.

All I/O modules of DCS system are equipped with CPU, which can realize the acquisition and output signal quality judgment and scalar transformation, fault charging, random replacement. The PLC module is just a simple electrical converter, there is no intelligent chip, and the corresponding unit is all paralyzed after the failure.

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