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So does it mean that I can program a N/C as normally open into PLC. And once I run the program, the n/o button will change to n/c instantly. And if I program a n/c as normally clOse, then it will change to normally open once I run the program. Is that right??

In a PLC. It's got retentive memory if you turn Plc power off for a few seconds, then you might be able to reset the value of those things. Another reason I think is possible is that the plc diagram is faulty... Just a guess.

Hi, guys I know you have to program an emergency stop button as normally open button and it's for safety. But a stop button is a normally close button. How can you program a normally close as normally open? Do you still need to close the stop button at the beginning if you've already...