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”。
Pacific Scientific SRF3752-4984 Motor w/ Kebco =
PACIFIC SCIENTIFIC SC403002 SERVO CONTROLLER
Pacific Scientific Drive SCE 900
PACIFIC SCIENTIFIC SC402010 SERVO CONTROLLER
Pacific Scientific Model: SC403-002 Servo Controller
Pacific Scientific PC800 PC834 Brushless Servo Drive
NEW Pacific Scientific PC3403Ai-001-RI PC3403Ai001RI
PACIFIC SCIENTIFIC SERVO MOTOR R35KEAP-R2-NS-NV-00 REB!
2 Pacific Scientific Sigmax Step Motor E21NCHT-JDF-00
Pacific-Scientific Servo Motor VC3640-278-1-48C Used
