actuator drive problem on PLC outputs

[edgar.guerra]

Good morning I am using a code so that when the plc is turned off it returns to its previous screen but I need to use another additional instruction because if before turning off some output is working when it is turned on it returns to the screen and continues with the output activated which can damage any actuator that is being driven by that output, how can I solve it

 

[Flex727]

It will depend on what's turning on that output. If it's a SET coil, then use the Power-Up feature to RESET the output. If it's a direct coil, then you will need code to stop the coil from being activated at power on.

[edgar.guerra]

40 minutes ago, Flex727 said:

Dependerá de lo que active esa salida. Si se trata de una bobina SET, utilice la función de encendido para RESTABLECER la salida. Si se trata de una bobina directa, necesitará un código para evitar que la bobina se active al encenderla.

with the ignition function you could reset the variables that activate the output, but exactly what would be the ignition function. SB2?

[Flex727]

SB 2 is called the Power-Up System Bit. It is on during the first PLC scan and is off thereafter.