Re: Festo double solenoid problems
 

Just a thought, is your solenoid card in Slot 7? It needs to be for 24v to work. Even after changing it to slot 7, you need to change your code (the default uses slot 8)

Jacob

Re: Festo double solenoid problems
 

our solenoid card is in slot 8, but the FESTO's lights wont turn on.

Re: Festo double solenoid problems
 

I am going to let someone with more expertise on that explain the watchdog. It must be fed is all I can say. The red wire connects to the positive battery terminal and the black to the negative terminal if you are trying to check the valve. I believe the valve will still function if you reverse the leads but the LED will not come on.