描述
继电器控制线路中各继电器同时都处于受控状态，属于并行工作方式。而PLC的控制逻辑中，各内部器件都处于周期性循环扫描过程中，各种逻辑、数值输出的结果都是按照在程序中的前后顺序计算得出的，所以属于串行工作方式。
AGILENT hp E5405A SINGLE-ENDED DIFFERENTIAL PROBE #1
Agilent/HP 8904A DC-600 KHz Multifunction Synthesizer
Agilent HP E3645A 35/60V, 2.2/1.3A, Power Supply
Agilent / HP 8662A High-Performance Signal Generator
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HP / Agilent 6274B DC Power Supply 0-60V 0-15A
Agilent HP 8657A 100KHz-1.040GHz Signal Gen Opt 001
HP/Agilent 6612C DC Bench Power Supply 20V, 2 A, 40 W
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HP Agilent 5890 A / 5890A Gas Chromatograph GC
HP/Agilent 8407A 8412B Network Analyzer Phase Magnitude
HP Agilent 8660D Synthesized Signal Generator
HP/Agilent 6613C DC Bench Power Supply 50V, 1 A, 50 W
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