Use a NC 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.
The other instruction can be an output instruction or any instruction other than an input. You cannot use a NC instruction without including another instruction just to the left of the right power bar.
Program Example
Point A
When the bit variable Start turns ON, the NC instruction opens the contact.
The bit variable Motor turns OFF.
Point B
When the bit variable Start turns OFF, the NC instruction opens the contact.
The bit variable Motor turns ON.
To retain the state when the power is turned OFF, set the symbol variable to Retentive.
Use a retentive address for the address format. (The retentive setting cannot be used for external inputs and outputs.)