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.)
