1720-L905 AB

VE4070
2711P-T7C4D8
SGMG-18B2ABC
YT204-001AF
3ASD-489301A410YPK107A
DS200SLCCG3A
6SE7035-1EJ84-1JC2
WD5-008.051.00
BM4423-ST0-01200-03
3HAC035301-001
3HAC039603-001

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描述

为了便于读出、检查和修改,用户程序一般存于CMOS静态RAM中,用锂电池作为后备电源,以保证掉电时不会丢失信息。为了防止干扰对RAM中程序的破坏,当用户程序经过运行正常,不需要改变,可将其固化在只读存储器EPROM中。现在有许多PLC直接采用EEPROM作为用户存储器。

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