描述
PLC控制系统的程序设计要点。PLC控制系统I/O分配，依据生产流水线从前至后，I/O点数由小到大;尽可能把一个系统、设备或部件的I/O信号集中编址，以利于维护。定时器、计数器要统一编号，不可重复使用同一编号，以确保PLC工作运行的可靠性。
TEKTRONIX STEREO AUDIO LEVEL PHASE CD MASTERING MONITOR
NASA GEMINI ANALOG ELECTRIC DUAL STOP WATCH CLOCK TIMER
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SR-71 BLACKBIRD FLIGHT INSTRUMENT STOP CLOCK BOMB TIMER
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STEAMPUNK ANALOG ELECTRIC DUAL STOP WATCH CLOCK TIMER
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NASA GEMINI FLIGHT INSTRUMENTS ANALOG STOP WATCH TIMER
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ULTIMATE 300B TUBE AUDIO POWER AMPLIFIER POWER SUPPLY
LAMBDA EMS 13-150-2-D 0-13V@0-150A DC LAB POWER SUPPLY
VARIABLE AC POWER SOURCE SUPPLY 0-135 0-270V 50HZ 500VA
PANASONIC COLOR VIDEO MONITOR DIGITAL 4WAY MULTI CAMERA
HP 6448B 0-600V@ 0-1.5A REGULATED DC BENCH POWER SUPPLY
