傳統的繼電器控制系統使用了大量的中間繼電器、時間繼電器，由于觸點接觸不良，容易出現故障。PLC用軟件代替大量的中間繼電器和時間繼電器，僅剩下與輸入和輸出有關的少量硬件元件，接線可減少到繼電器控制系統的1/10-1/100，因觸點接觸不良造成的故障大為減少。主電路是給異步電動機提供調壓調頻電源的電力變換部分，變頻器的主電路大體上可分為兩類：電壓型是將電壓源的直流變換為交流的變頻器，直流回路的濾波是電容。鄭工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