Storage of PLC system is introduced. the system memory user memory

PLC system is mainly used for storage of the storage system, user and working state data. The PLC controller memory including the system memory and user memory. ( 1) System memory system memory used to store system program written by the PLC manufacturer, and curing in ROM, user can't change. It make a PLC has the basic function, can complete all work specified PLC designer. System program quality largely determines the performance of the PLC. ( 2) User memory user memory includes a user program memory ( Program area) And data storage ( Data area) Two parts. The user program memory used to store the user control for specific tasks of PLC controller programming language user program. According to the user program memory chooses different storage unit types ( Can be a block RAM, EPROM or EEPROM memory) , its contents can be modified by the user or add or delete. Can be used to store user data storage ( Memory) The user program used in the device ON/OFF state and data, and so ON. User memory size is related to the size of the capacity of the user program, is one of the important indicators of reflect the performance of PLC. In order to read, check and modification, the user program generally exist in CMOS static RAM, use lithium battery as backup power supply, to ensure that the is not lost when the power lost information. In order to prevent interference to the destruction of the RAM program, when a user program after normal operation, do not need to change, it can be cured in the read only memory EPROM. Now there are many PLC directly using EEPROM memory user memory. Working data is often change, often in the process of PLC running some of the data access. Stored in RAM, to adapt the demand of random access. Have stored in the PLC data storage, input/output relay, auxiliary relay, logic devices such as timers, counters, store, state of these devices are made by the initial setup and running situation of the user program. According to the need of some data when power down with back-up battery to maintain its existing state, this part can save when useing data storage area called a data area. Because of system program and work data not directly contact with the user, so the PLC product samples or manual listed in the form of memory and capacity refers to the user program memory. When the PLC to provide user memory capacity is not enough to use, also provides many PLC memory extended functionality. There are two main types of memory: one kind is can read/write operation of random access memory RAM, the other is a read only memory (ROM) or erasable programmable read-only memory ROM block, PROM, EPROM and EEPROM.
Shenzhen Coolmay Technology Co., Ltd. is a company that offers a wide selection of . OEM and ODM services are also available to users. To know more, go to Coolmay PLC.
Shenzhen Coolmay Technology Co., Ltd. aims to hire several additional experienced marketing professionals that can add to our existing talent-pool and help continue the steady growth of our business.
Depending on the scale of the service, Shenzhen Coolmay Technology Co., Ltd. might also need to hire and manage an overseas workforce and comply with regulatory requirements.
Simultaneously being able to offer not only the product but also the service, gives the customer a quality 'one-stop-shop' service.