PLC是采用“顺序扫描，不断循环”的方式进行工作的。即在PLC运行时，CPU根据用户按控制要求编制好并存于用户存储器中的程序，按指令步序号（或地址号）作周期性循环扫描，如无跳转指令，则从第一条指令开始逐条顺序执行用户程序，直至程序结束。然后重新返回第一条指令，开始下一轮新的扫描。在每次扫描过程中，还要完成对输入信号的采样和对输出状态的刷新等工作。
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OBARA WZS05-00-SF GUN FIXTURE
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OBARA GEAR CASE 1-353440
OBARA A-TX6574NR-RC-196-C ROBOT GUN
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NUMATICS 33DSP500E000061 PNEUMATIC VALVE
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NUM ConTROL PANEL W/ KEYBOARD DISPLAY 205202821
NUM AMS132LI1B22CR1 MOTOR
N-TRON 516TX ETHERNET SWITCH
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NSK EXEA1-0010T00-03 CONTROLLER
NSD VS-032
NSD CORP. VS-CYCL-UNNP-1-1.0
NR&D AIM4-3M ASCII INPUT MODULE
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NORTHSTAR RL671024J04CL MAGNETORESISTIVE ENCODER
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NORTHSTAR R81024LE081LC
NORTHSTAR R81024LE081LC *FACTORY SEALED*
NORTHSTAR R80240LK162LC
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NORGREN 8112278.024VDC
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