一些用户通过PROM选项而不使用备用电池。参看下面叫做“没有存储备用电池的操作”的部分从而决定这种策略是否适合您的应用.备份您的程序的重要性不管使用何种策略去保持PLC的存储器。都要经常保持更新应用程序的备份，另外要注意以下几个小的方面:确认在需要用到的时候备份程序容易得到培训不止一个的人可以下装备份程序以避免当需要的时候这个人不在。

CAPP/USA 20308 ELECTRIC ACTUATOR

KARL DUNGS EMA-418-2 ACTUATOR

CUTLER-HAMMER E51SNL PHOTOELECTRIC SENSOR, NNB

RITE-HITE GUARDIAN 1340 BARRIER CURTAIN CONTROLLER NNB

FUJI ELECTRIC BU-FHB3020 CIRCUIT BREAKER, NIB

RED LION CUB4L000 MINIATURE ELECTRONIC COUNTER, NIB

RED LION CUB4L800 MINIATURE ELECTRONIC COUNTER, NIB

SCHNEIDER TSXFPACC4 TERMINAL ISOLATION BOX, NIB

ADVANCE TRANSFORMER 79W8192 HIGH PRESS. SODIUM BALLAST

APOLLO CONBRACO PNEUMATIC POSITIONER, ?”, NNB

ROSS 2774B4001 3/2 NORMALLY OPEN SINGLE SOLENOID PILOT

UCHIDA HYDRAULICS C-06G-C-340 HYDRAULIC VALVE,

JOSLYN MFG. 8154C0018J001 DISTRIBUTION CLASS ARRESTER,

MODICON 557VKB20310 FactoryMate KEYBOARD PLUS W/ MOUSE

GEWISS GW 63 055 CONNECTOR W/ GW 61 055 PLUG AND CABLE

NUMATICS I24RT115JP00000 DUAL PRESSURE REGULATOR, NNB S

TWIN CITY FAN AND BLOWER, FCV FAN WHEEL, 12.25″ DIAMETE