描述
继电器控制逻辑采用硬接线逻辑，利用继电器机械触点的串联或并联，及时间继电器等组合成控制逻辑，其接线多而复杂、体积大、功耗大、故障率高，灵活性和扩展性很差。而PLC采用存储器逻辑，其控制逻辑以程序方式存储在内存中，灵活性和扩展性都很好。
Agilent HP 37722A Digital Telecom Analyzer Opt. 908 H02
HP/Agilent 16715-68702 Options Brand New in Sealed Bag
HP/Agilent-34401A, 6.5-Digit, State-Of-The-Art M/Meter
NIST-Traceable Calibration, Includes 90-Day Warranty!
Expedited shipping available
New! HP Agilent E1723 DSP Servo Board E1723-69002
One-day shipping available
HP 1743A OSCILLOSCOPE 100MHZ W/SERVICE MANUAL & PROBES
AGILENT/HP 8112A PULSE GENERATOR CALIBRATED 12/2010
Agilent HP 4142B Moduler DC Source
HP Agilent 8482A Power Sensor, 100 kHz to 4.2 GHz
HP AGILENT 140T 8552B 8553B SPECTRUM ANALYZER
HP Agilent 54622A Digital Storage Oscilloscope Works
with Probes, Cover, Power Cord, Pouch, Manuals
