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”。
HP 54512B Digitizing 300MHz 1 GSa/s Oscilloscope
One-day shipping available
HP AGILENT 16700A W/ 16555D & 2- 16717A PLUG IN OPT 003
HP INFINIUM 500 MHZ 1 GSa/s 54815A OSCILLOSCOPE- REPAIR
Expedited shipping available
HP 6633A System DC Power Supply. 0-50V / 0-2A Agilent
Agilent/HP 70611A Switch
AGILENT HP 1153A 200 MHz DIFFERENTIAL PROBE
HP AGILENT 41800A ACTIVE PROBE TESTED GOOD WITH MANUAL
HP Agilent 773D (2 – 18 GHz) Directional Coupler (002)
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Agilent HP 4263A LCR Meter.
AGILENT HP 54720A 2 GHz OSCILLOSCOPE MAINFRAME
