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传统的继电器控制系统使用了大量的中间继电器、时间继电器，由于触点接触不良，容易出现故障。PLC用软件代替大量的中间继电器和时间继电器，仅剩下与输入和输出有关的少量硬件元件，接线可减少到继电器控制系统的1/10-1/100，因触点接触不良造成的故障大为减少。主电路是给异步电动机提供调压调频电源的电力变换部分，变频器的主电路大体上可分为两类：电压型是将电压源的直流变换为交流的变频器，直流回路的滤波是电容。郑工199 59 281761

WAGO,790-116.,SCREEN CLAMP, 16MM CONDUCTOR
WAGO,770-676,T-CONNECTOR, WINSTA MIDI, 4P,
WAGO,770-656,T-CONNECTOR, WINSTA MIDI, 3P,
WAGO,770-134,PLUG & HOUSING, WINSTA MIDI, 4P
WAGO,770-133,PLUG & HOUSING, WINSTA MIDI, 3P
WAGO,770-124,SOCKET & HOUSING, WINSTA MIDI
WAGO,770-123,SOCKET & HOUSING, WINSTA MIDI
WAGO,770-115,PLUG & HOUSING, WINSTA MIDI, 5P
WAGO,770-114,PLUG & HOUSING, WINSTA MIDI, 4P
WAGO,770-105,SOCKET & HOUSING, WINSTA MIDI
WAGO,770-104,SOCKET & HOUSING, WINSTA MIDI
WAGO,733-204.,PLUG, STRAIGHT, 4WAY
WAGO,733-203.,PLUG, STRAIGHT, 3WAY
WAGO,733-112,PLUG, RIGHTANGLE, 12WAY
WAGO,733-110.,PLUG, RIGHTANGLE, 10WAY
WAGO,733-104.,PLUG, RIGHTANGLE, 4WAY
WAGO,733-103.,PLUG, RIGHTANGLE, 3WAY
WAGO,51228987,INSTALLER BOX, BASIC
WAGO,284-901,TERMINAL BLOCK, DIN, 57A, GREY
WAGO,284-402,JUMPER, ADJACENT, INSULATED, GREY
WAGO,282-334.,END PLATE
WAGO,282-311,END PLATE, GREY
WAGO,282-122,TERMINAL BLOCK, F, DIN, 20MM
WAGO,282-101,TERMINAL BLOCK, DIN, 41A, GREY
WAGO,281-907,TERMINAL BLOCK, EARTH, DIN, 32A
WAGO,281-901,TERMINAL BLOCK, DIN, 32A, GREY
WAGO,281-681,TERMINAL BLOCK, DIN, 4MM, 3COND
WAGO,281-652,TERMINAL BLOCK, DIN, 4COND, 26A
WAGO,281-611,TERMINAL BLOCK, F, DIN, 5X20MM
WAGO,281-530,TERMINAL BLOCK, MOTOR WIRING
WAGO,281-402,JUMPER, ADJACENT, INSULATED, GREY