The Industrial Raspberry Pi Forum

Hello,

I'm designing a machine where the IO activates some valves.
I want to remove the 24V to the outputs so no signal can be given to the valves when an emergency stop is activated.
Then an input of the IO module will signal that the 24V has dropped on the outputs so emergency stop mode needs to be activated.
is this possible without breaking the I/O module? or should I look for a different solution?

That can be implemented exactly like this. Your emergency stop simply removes the 24 V from pin 4 on connector X2 (the top one). This only removes the voltage for the actuators (valves), the module and the inputs can continue to be used. Note: The internal status of the outputs is still set to High!
If the emergency stop is reset, the actuators would get the 24 V signal again.
As I read from your text, you are now giving the emergency stop signal to an input. This allows you to react perfectly to the situation and you can set the internal state of your outputs to "low".

https://revolutionpi.com/tutorials/over ... er-supply/

Sven