1768-PA3
1768-PA3
1768-PA3
3.CPU模块中的存储器
存储器分为系统程序存储器和用户程序存储器，系统程序相当于个人计算机中的操作系统，它使PLC具有基本的智能，能完成PLC设计者的规定的各种工作。系统程序由PLC的生厂家设计并固定化在ROM（只读存储器）中，用户不能读取。用户程序由用户设计，它使PLC能完成用户要球的特定功能，用户程序存储器的容量以字节（B）为单位。
（1）.随机存取存储器（RAM）
用户可以用编程装置读出RAM中的内容，也可以将用户程序写入RAM，因此RAM又叫读/写存储器。RAM的工作速度高、价格便宜、改写方便。
（2）.只读存储器（ROM）
ROM的内容只能读出，不能写入。
（3）.可以电檫出可编程的只读存储器（EEPROM）
S7-200用EEPROM来存储用户程序和长期保存的重要数据。
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HP/Agilent 8722ES Network Analyzer,50MHz-40GHz
HP/Agilent 8720ES Vector Network Analyzer 50MHz-20GHz
E8241A PSG-L Series Performance Signal Generator, 20 G
HP/Agilent 83630A Synthesized Swept-Signal Generator
E4405B ESA-E Series Spectrum Analyzer, 9 kHz to 13.2 G
ENI 5100L-NMR 1.5-400MHz 100W Power Amplifier
HP/Agilent 8753D Network Analyzer, 30 kHz to 6 GHz
HP/Agilent 8563E Spectrum Analyzer, 30 Hz to 26.5 GHz
HP/Agilent 4194A Impedance/Gain-Phase Analyzer
5087-7281 Multiplier Amplifier Switch Splitter Assembly
HP/Agilent 8340A Synthesized Sweeper,10 MHz 26.5 GHz
HP/Agilent 8593E Spectrum Analyzer, 9 kHz to 22 GHz
HP/Agilent 8563A 9 kHz 22 GHz spectrum analyzer
HP/Agilent 8902A Measuring Receiver
HP/Agilent 85052B Standard Mechanical Calibration Kit
8560E Portable Spectrum Analyzer, 30 Hz to 2.9 GHz
HP/Agilent 8970B Noise Figure Meter, 10 MHz to 2047 MHz
HP/Agilent 8970B Noise Figure Meter, 10 MHz to 2047 MHz
HP/Agilent 85047A S-Parameter Test Set,300 kHz to 6 GHz
HP/Agilent 85047A S-Parameter Test Set,300 kHz to 6 GHz
HP/Agilent 5087-7277 TBR Mixer Brick 20 GHz
HP/Agilent 5087-7070 Yig Tuned Harmonic Mixer
HP/Agilent 5086-7884 YIG TUNED HARMONIC MIXER
HP/Agilent 5087-7031 Yig Tuned Harmonic Mixer
HP/Agilent 8648D Signal Generator,9 KHz - 4 GHz
HP/Agilent 5361B Pulse / CW Microwave Counter, 40 GHz
HP/Agilent 11793A Microwave Converter
HP/Agilent 8591C CABLE TV ANALYZER ,OPT 011 041 107 130
HP/Agilent 8648D Signal Generator,9 KHz - 4 GHz
E4422B ESG-A Series Analog RF Signal Generator, 4 GHz
E4422B ESG-A Series Analog RF Signal Generator, 4 GHz
HP/Agilent 85331-60033 Transfer Switch
HP/Agilent E5071-66571 source board
HP/Agilent 11848A Phase noise interface for the 3048A
HP/Agilent 5086-7620 Source Module Mixer
HP/Agilent 85134F Flexible Cable Set, 2.4 mm to 3.5 mm
HP/Agilent 5087-7034 Yig Tuned Harmonic Mixer
HP/Agilent E4403-60074 3GHZ RF Assy, opt 1D5
HP/Agilent E4403-60073 3GHZ RF Assy
HP/Agilent 5086-6981 YIG TUNED HARMONIC MIXER
HP/Agilent 5086-7472 SWITCH/DOUBLER, 40GHz
HP/Agilent 70590A OPT Z40 RF SECTION RANGE 26.5 - 40GHz
HP/Agilent 5086-7589 Switch, 40 GHz
Ando AQ8423B Optical Amplifier Analyzer
HP/Agilent 85332-60003 UTG Microwave Switch,0.045~40G
HP/Agilent 83492A Optical clock recovery module
HP/Agilent 8971C Noise Figure Test Set,10MHz to 26.5GHz
HP/Agilent 5087-7238 Reference Switch
HP/Agilent E5071-61015 TBR Module,carpenter RCV RF
HP/Agilent 08719-60009 YIG TUNED OSCILATOR
HP/Agilent 5087-7081 YIG TUNED OSCILATOR
HP/Agilent 4xE5250A Low-leakage Switch Main
HP/Agilent 4338B Milliohmmeter, 1 kHz
HP/Agilent 5086-7583 Low Band Microcircuit Assembly
5086-7465 TBR Microcircui
HP/Agilent 8720D/8722D Front Panel
HP/Agilent 85027B Directional Bridge, 10 MHz to 26.5 GH
HP/Agilent 85046A S-Parameter Test Set
HP/Agilent 85046A S-Parameter Test Set
HP/Agilent 85046A-P S-Parameter Test Set
HP/Agilent E4440-60170 LO synth/ sampling osc assembly
HP/Agilent E4400-60718 Assembly Board Sampler
HP/Agilent 5086-7515 YIG Oscillator 2.0 - 7.5GHz
HP/Agilent 33326-60006 ATTENUATOR 55 db 40 GHz
HP/Agilent 33326-60002 ATTENUATOR 90 db 40GHz
HP/Agilent 5086-7968 Dir Coupler
HP/Agilent 33326-60003 ATTENUATOR 90 db 50 GHz
HP/Agilent E4440-60201 Board Assembly Reference
HP/Agilent E4440-60195 Printed circuit assembly
HP/Agilent 70905A RF Section, 50 kHz to 22 GHz
HP/Agilent 5086-7803 SYTF for 8595E 8561E 8561A 8561EC
HP/Agilent 85134-60004 2.4mm to 3.5mm Flexible Cable
HP/Agilent E4440-60213 Board-Assembly 3RD CONV
HP/Agilent E4400-60659 Board Assembly - Output
HP/Agilent E4400-60505 OUTPUT BOARD
HP/Agilent E4423-60500 Midgen Ref Board
HP/Agilent 33327-60001 ATTENUATOR
Noise/Com UFX-BER 2191/5501 Precision CN Generator
HP/Symmetricom 58503A GPS Time and Frequency Receiver
HP/Agilent 33325-60004 60 dB Attenuator, DC ~ 50 GHz
HP/Agilent E4440-60114 2ND LO Assembly
Agilent Technologies 5087-7077 YIG TUNED OSCILATOR
HP/Agilent 84905-60001 50 dB Attenuator, DC ~ 50 GHz
HP/Agilent 85331-60035 Switch, Replace by 5086-7642
HP/Agilent 33325-60012 60 dB Attenuator, DC ~ 50 GHz
AVANTEK 0955-0277 YIG FILTER
AVANTEK 0955-0277 YIG FILTER
HP/Agilent 5086-7484 Bias Tee Assembly 50GHz
HP/Agilent 33325-60006 60 dB Attenuator, DC ~ 50GHz
Tektronix TDS620 500 MHz, 4(2+2) Ch, 2GS/s, Oscilloscop
HP/Agilent 70300A RF Tracking Generator,20Hz t-2.9GHz
HP/Agilent 33327-60002 Attenuator, 70B 3-Section
