i have a question about a flip flop example.
1 have an emergency stop flip flop.( m0.0)
it is set by pushing the emergency stop button. (i0.0)
reset by reset button.(i0.1)
now my question.
if the plc is off and when i turn on the plc.
The flip/ flop needs to be set. (true)
Even if the emergency stop button is not be used)(in the beginning)
and before i go further with the rest of the programm.
i first need to reset the emergency stop.
and than i can start my motor.
I know i need to use a retentive flip/flop.
But how do i need to programm this?
It should work after i turn my plc off and than on.
first i need to reset my emergency stop with reset stop button.the flip/flop did not get a true signal by I0.0
thanks
thank you.
Hi,
you can use the system memory bit "First scan", paralel on "I0.0".
See photo.
To use system memory bit, you must activate on "Device configuration/Properties/System and clock memory, and set address byte.