Honeywell系列SPS5710-2-LF 51198685-100控制系统电源模块

Honeywell系列SPS5710-2-LF 51198685-100控制系统电源模块

可编程控制器的存储器由只读存储器ROM、随机存储器RAM和可电擦写的存储器EEPROM三大部分构成，主要用于存放系统程序、用户程序及工作数据。

只读存储器ROM用以存放系统程序，可编程控制器在生产过程中将系统程序固化在ROM中，用户是不可改变的。用户程序和中间运算数据存放的随机存储器RAM中，RAM存储器是一种高密度、低功耗、价格便宜的半导体存储器，可用锂电池做备用电源。它存储的内容是易失的，掉电后内容丢失;当系统掉电时，用户程序可以保存在只读存储器EEPROM或由高能电池支持的RAM中。EEPROM兼有ROM的非易失性和RAM的随机存取优点，用来存放需要长期保存的重要数据。

The memory of the programmable controller is composed of ROM, RAM and EEPROM, which is mainly used to store system programs, user programs and working data.

Read-only memory ROM is used to store system programs, programmable controller in the production process of the system program solidified in ROM, the user is immutable. RAM, where user programs and intermediate computing data are stored, is a high-density, low-power, inexpensive semiconductor memory that can be used as backup power from lithium batteries. Its stored content is volatile, the content is lost after power failure; In the event of a system power failure, user programs can be saved in read-only memory EEPROM or RAM supported by a high-energy battery. EEPROM has the advantages of non-volatility of ROM and random access of RAM, and is used to store important data that needs to be stored for a long time.