PLC memory is the place to save programs and data.It is divided into internal standard and extrapolated type.The memory capacity is between 512 and 128M bytes.It is necessary to select a large enough memory according to the actual situation,and a part of the memory is required as a buffer.
PLC memory can be divided into random access memory(RAM),read only memory(ROM),erasable read only memory(EPROM)and so on according to the type.RAM can be read and written arbitrarily,and the program can only be kept for a period of time after power failure,which is most suitable for use in automatic control system debugging.ROM can only be read but not written.The program is solidified in advance by the manufacturer or developer and cannot be changed.Even if the power is lost,it will not be lost.EPROM and ROM are only EPROMs that can be erased and rewritten by special methods(such as ultraviolet rays),which are suitable for use in systems that work for a long time and do not change much.
PLC存储器是保存程序和数据的地方,分内制式和外插式两种,存储器容量在512~128M字节之间,一定要根据实际情况选取足够大的存储器,并且要求有一部分空余作为缓存。
PLC存储器按照类型可分随机存储器(RAM)、只读存储器(ROM)、可擦除只读存储器(EPROM)等。RAM可以任意读写,在掉电后程序只能保持一段时间,最适合于在自控系统调试时使用。ROM只能读不能写,程序是由厂家或开发商事先固化的,不能更改,即使失电也不丢失。EPROM与ROM只是EPROM通过特殊的方式(如紫外线)可以擦除再写,适合于应用在长时间工作而改动不大的系统中。
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