Use a NO instruction to determine the ON or OFF state. The instruction can be used to determine the ON or OFF state of an external input or an internal coil.
You cannot use a NO instruction without including another instruction just to the left of the right power bar. The other instruction can be an output instruction or any instruction other than an input.
Program Example
Point A
When the bit variable (Start) turns ON, the NO instruction closes the contact.
The bit variable (Motor) turns ON.
Point B
When the bit variable (Start) turns OFF, the NO instruction opens the contact.
The bit variable Motor turns OFF.