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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**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**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。
PLC的一个扫描周期必经输入采样、程序执行和输出刷新三个阶段。
KELTRON HP070211 (A) 204515 69307 VIDEOJET LOT OF 2
KEPCO RA19-6B-24800 RACK ADAPTER, 100/120/220/240 VOLTS, 50/60 HZ,
KEPNER 2806P2 VALVE, (LOT OF 2)
KEROTEST 1-1/2 VALVE, FIG: TVD-D-10013, 2580 PSI, CLASS 3
KEY TECHNOLOGY 94-155204-001 FBSV VIDEO MEMORY
KEYENCE 50214528 SENSOR
KEYENCE CORIOLIS FD-S SERIES FLOW SENSOR 1.0L
KEYENCE FD-M SERIES ELECTROMAGNETIC FLOW SENSOR 10L
KEYENCE FD-M SERIES ELECTROMAGNETIC FLOW SENSOR 10L
KEYENCE FD-SA1PA CORIOLIS FLOW SENSOR
KEYENCE FU-40 FIBER OPTIC SENSOR
KEYENCE GH-513 POWER SUPPLY
KEYENCE KV-D20 OPERATOR INTERFACE PANEL
KEYENCE KV-R16R 24 V DC TERMINAL RELAY
KEYENCE KV-R16R 24 V DC TERMINAL RELAY
KEYENCE KV-R16X MODULE (LOT OF 4)
KEYENCE LB-1201 LASER SENSOR
KEYENCE OPERATOR INTERFACE PANEL KV-D20
KEYENCE PS2-61P PHOTOELECTRIC SENSOR
KEYSTONE 120/790/500 ACTUATOR
KEYSTONE 120-790-500 PNEUMATIC ACTUATOR,
KEYSTONE YARWAY 2 IMPULSE STEAM TRAP, HIGH CAPACITY, 600 PSI MAX, LOT OF 3,
KEYSTONE YARWAY 2 IMPULSE STEAM TRAP, HIGH CAPACITY, 600 PSI MAX, LOT OF 3,
KIKON GIKEN MLXA-A12-640-10 VISILBE LASER
KILLARK STAHL 8013/22 INDICATING LIGHTS, 24V AC/DC, LOT OF 2,
KIMBLE FILLING FUNNEL 29020 SIZE 80MM
KIMBLE FUNNEL FILLING 29020 SIZE 80 MM
KIMRAY HT 12 PG, 5-30 PSIG
KINETROL 050 SPRING RETURN, TENSION SPRING, 1/2 , 7 BAR,
KINETROL MAUAL ACTION 2 BALL VALVE, TENSION SPRING
KINETROL MAUAL ACTION 2 BALL VALVE, TENSION SPRING
KINETROL SPRING RETURN, TENSIONED SPRING, MODEL 050, 1/2 , 7 BAR,
KINETROL SPRING RETURN, TENSIONED SPRING, MODEL 050, 1/2 , 7 BAR,
KING 7700 SERIES FLOWMETER 7711230718
KING-GAGE 5900-3-0-1-1 DP MODULE PRESSURE TRANSMITTER
KING-GAGE 5900-3-0-1-1 DP MODULE PRESSURE TRANSMITTER
KING-GAGE DP MODULE 5900-3-0-1-1 PRESSURE TRANSMITTER
KING-GAGE DP MODULE 5900-3-0-1-1 PRESSURE TRANSMITTER
KING-GAGE DP MODULE MOD. 5900-3-0-1-1 PRESSURE TRANSMITTER
KING-GAGE DP MODULE MOD. 5900-3-0-1-1 PRESSURE TRANSMITTER
KITZ 1 PNEUMATIC BRASS BALL VALVE C-1
KITZ 1 PNEUMATIC BRASS BALL VALVE, C-1
KITZ 1 PNEUMATIC BRASS BALL VALVE, C-1
KITZ 1-1/2 VALVE
KITZ 3/4 PNEUMATIC BALL VALVE C-1 (BRASS)
KLINGER 3/4 VALVE KX-MODUL
KLINGER/SN DN 2 VALVE
KLINGER/SN DN 2 VALVE
KLOCKNER MOELLER DIGITAL OUTPUT BOARD 16X0.*
KLOCKNER-MOELLER (4) ZO-1,2-CNA AND (1) ZO-6,6/K-NA, BIMETAL RELAY,LOT OF 5,
KOBOLD NKP-6401/1 LEVEL SWITCH
KOBOLD SWK-1140Y
KOLLMORGAN PC 10022480 CONTROL BOARD
KOLLMORGEN BDS4A-203J-0001/202A21P
KOLLMORGEN INDUSTRIAL DRIVE- BDS4A-203J-0001202B21P
KOLLMORGEN INDUSTRIAL DRIVE PSR4*-250
KOLLMORGEN PSR POWER SUPPLY PSR4/*-250 |
