diraemon

ladder ladder program

5 posts in this topic

Hello everyone, I want to know why the Y172 coil is ON / logic 1? whereas contact SM1 is worth OFF / logic 0? can anyone explain it to me ?

1.jpg

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Hello,

according to your picture SM1 contact is Closed contact... basically it is negation

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40 minutes ago, sczot said:

Hello,

according to your picture SM1 contact is Closed contact... basically it is negation

is SM1 a type of Emergency button that must use NC at first?

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@diraemon SM1 are Special Relay for Self-diagnostics Error.

If it on that mean there are some error and vice versa.

For your ladder program if no Self-diagnostics Error Y172 will be on. (Because SM1 is off but convert logic with NC contact).

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