Graphic explanation reading method of PLC ladder diagram, drawing steps -

【 Ladder diagram 】

generally in the PLC controller program, said the current direction in the form of ladder diagram.

【 Ladder diagram of the circuit symbol 】

' What is A contact, B contact? 】

:

button switch after the press into OFF

called B contact ( BREAK contact) Or normally closed contacts, NC contact ( NORMALCLOSE)

COM terminal ( Common terminal)

after pressed into ON

called type A contact ( MAKE contact) , normally open contact or NO contact ( NORMALOPEN)

【 Summary 】

' The ladder diagram drawing step 】

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