PLC是采用“順序掃描，不斷循環”的方式進行工作的。即在PLC運行時，CPU根據用戶按控制要求編制好并存于用戶存儲器中的程序，按指令步序號（或地址號）作周期性循環掃描，如無跳轉指令，則從 條指令開始逐條順序執行用戶程序，直至程序結束。然后重新返回 條指令，開始下 輪新的掃描。在每次掃描過程中，還要完成對輸入信號的采樣和對輸出狀態的刷新等工作。

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MURRELEKTRONIK MP12 SDP12 A0788

MURRELEKTRONIK RMSA 12-24-DC MODULE RMSA1224DC INDEX V200 CNC LATHE

MURRELEKTRONIK SB 1861 MODULE SB1861 TRAUB TNM 42 CNC LATHE

MURRELEKTRONIK SB 1861 MODULE SB1861 TRAUB TNM 42 CNC LATHE

MVJNR 16-3D F6M 163D CNC TURRET TOOL TOOLING TOOLCUTTER CUTTER HOLDER

MX 9441 X 5-5/8BB CNC CINCINNATI MC02 CNC VERTICAL MILL CAT 50 ARM

MX 9441 X 5-5/8BB CNC CINCINNATI MC02 CNC VERTICAL MILL CAT 50 ARM

MX 9441 X 5-5/8BB CNC CINCINNATI MC02 CNC VERTICAL MILL CAT 50 ARM

MY CABLE 4 PIN HITACHI H-CUT 304S EDM MX CABLE 4 PIN HITACHI H-CUT 304S EDM

NACHI 0G-G01-PC-K-5581A HYDRAULIC MANIFOLD OG-G01-PC-K-5581A MAZAK VQC CNC

NACHI 0Y-G01-T-11 MODULAR VALVE OY-G01-T-11 0YG01T11 OYGO1T11 MAZAK VQC CNC

NACHI AC SERVO MOTOR TS 4063N800E22 A1275 TS4063N800E22

NACHI AC SERVO MOTOR TS 4063N800E22 A1275 TS4063N800E22

NACHI AC SERVO MOTOR TS4144N 1E36 TORQUE 36

NACHI AC SERVO MOTOR TS4144N 1E36 TORQUE 36

NACHI AC SERVO TS-4063N800E22 TS4063N800E22 3000RPM NACHI FOJIKOSHI

NACHI AC SERVO TS-4144N 1E36 3000RPM NACHI FOJIKOSHI TS-4144N

NACHI AR CONTROLLER PANEL W/ EMERGENCY STOP NACHI FOJIKOSHI

NACHI ASEA ABB CP40 DISPLAY CIRCUIT BOARD CPU 517 25.09.87

NACHI ASEA BATTERY DISPLAY UNIT NT40 BUR NT031

NACHI ASEA CONTROL BOARD A163 BUR MA3/2 BURMA3/2

NACHI ASEA DISPLAY CIRCUIT BOARD S-2724A

NACHI CIRCUIT BOARD UM835 RT-A 11-95080715 SSE 10 CIRCUIT BOARD UM835A

NACHI CNI POWER SUPPLY C.N.I. SR1 F103 179.50

NACHI CNI POWER SUPPLY C.N.I. SR1 F103 179.50

NACHI COSEL FJK2005A NEC-14T POWER SUPPLY BOARD FJK2005A NACHI FOJIKOSHI

NACHI COSEL NEC POWER SUPPLY FJK2005A

NACHI COSEL NEC POWER SUPPLY FJK2005A

NACHI DIRECTIONAL CONTROL DOUBLE SIDED VALVE SL-G01-A3X-GR-D2-11 SL-GO1-A3X-GR

NACHI DIRECTIONAL CONTROL VALVE S-G01-A2X-GRZ-D2-32

NACHI DIRECTIONAL CONTROL VALVE S-G01-A3X-GRZ-D2-32

NACHI DIRECTIONAL CONTROL VALVE S-G01-A3X-GRZ-D2-32

NACHI DIRECTIONAL CONTROL VALVE S-G01-A3X-GRZ-D2-5456A

NACHI DIRECTIONAL CONTROL VALVE S-G01-B3X-GRZ-D2-32

NACHI DIRECTIONAL CONTROL VALVE S-G01-C5-GRZ-D2-32

NACHI DIRECTIONAL CONTROL VALVE S-G01-C6-GRZ-D19-9390A

NACHI DIRECTIONAL CONTROL VALVE S-G01-C6-GRZ-D19-9390D

NACHI DIRECTIONAL CONTROL VALVE S-G01-C6-GRZ-D2-32

NACHI DIRECTIONAL CONTROL VALVE S-G01-C6-GRZ-D2-32

NACHI DIRECTIONAL CONTROL VALVE SL-G01-C5-GR-C1-11 940

NACHI DIRECTIONAL CONTROL VALVE SL-G01-C6S-GR-C1-9787A

NACHI DIRECTIONAL CONTROL VALVE SL-G01-C6S-GR-C1-9787B

NACHI DIRECTIONAL CONTROL VALVE SL-G01-E3X-GR-D2-11

NACHI DIRECTIONAL CONTROL VALVE SS-G01-A3X-G0R-C1-9286C

NACHI DIRECTIONAL CONTROL VALVE SS-G01-A3X-GR-C1-12

NACHI DIRECTIONAL CONTROL VALVE SS-G01-A3X-GR-C1-12

NACHI DIRECTIONAL CONTROL VALVE SS-G01-C5-GR-C1-12 530

NACHI DIRECTIONAL CONTROL VALVE SS-G01-C5-GR-C1-12 530

NACHI DIRECTIONAL CONTROL VALVE SS-G01-C6S-GR-C1-9787A

NACHI DIRECTIONAL CONTROL VALVE SS-G01-E3X-GR-C1-12 530

NACHI DIRECTIONAL VALVE SA-G01-C6-C1-31

NACHI DIRECTIONAL VALVE SA-G01-E3X-C1-11

NACHI DIRECTIONAL VALVE S-G01-C6-CRZ-D19-9390A

NACHI DIRECTIONAL VALVE SL-G01-A3X-R-C1-11 060 SL-GO1-A3X-R-C1-11

NACHI DIRECTIONAL VALVE SL-G01-A3X-R-C1-11 060 SL-GO1-A3X-R-C1-11

NACHI DIRECTIONAL VALVE SL-G01-C5-R-C1-11 060

NACHI DIRECTIONAL VALVE SL-G01-E3X-R-C1-11 060

NACHI DIRECTIONAL VALVE SL-G01-E3X-R-C1-11 070 WITH GAUGE

NACHI DIRECTIONAL VALVE SS-G01-A3X-G0R-C1-9222B 6YO SS-G01-A3X-GOR-C1-9222B

NACHI DIRECTIONAL VALVE SS-G01-A3X-G0R-C1-9222B 6YO SS-G01-A3X-GOR-C1-9222B

NACHI DIRECTIONAL VALVE SS-G01-C6-R-C2-20 SS-GO1-C6-R-C2-20

NACHI FUJIKOSHI CRP HYDRAULIC MOTOR TANK PUMP UNIT MIYANO CNC-6BC LATHE