描述
除了I/O映象区以外，系统RAM存储区还包括PLC内部各类软设备（逻辑线圈、数据寄存器、计时器、计数器、变址寄存器、累加器等）的存储区。该存储区又分为具有失电保持的存储区域和无失电保持的存储区域，前者在PLC断电时，由内部的锂电子供电。使这部分存储单元内的数据得以保留；后者当PLC停止运行时，将这部分存储单元内的数据全部置“零”。
OKUMA Fixed 4 Rack A911-2904 E4809-770-132 Motherboard
Analog Devices ADZU-BF533-EZLITE evaluation board NEW
SKC AirChek 52 224-52 & Charger Power Flex 223-2000
Adapter for 80C2-D1F Engine Generator Sold As Is
Aircraft Part TUBE F0301 340-130-401-0 FA9C4 Sold As Is
Wonderware SuiteVoyager 2.0 Client Access License
8e6 Internet Filter IR security Server NEW
Megger RCDT320 RCD Tester
Suunto T6C Watch SS013579010 Data cable Heart Rate NIB
Agilent ZORBAX Eclipse XDB-C18 990967-902 4.6*250 5 NEW
50181010 Stahlwille 730N/10 Torque Wrench 20-100Nm
