ALU-2 Alarm Input Part

[MirkoGradassi]

Hi all, I've an ALU-2 board and I need to create an alarm only when the voltage on AL goes down.

I'm capable to open an alarm when I receive the 48V on my input port, I had done it with the command:

ALEII:BPOS=1-1-20,ALI=1,CODE=801,TEXT=ALLARME1;

But What I need is exactly the opposite situation, where I have no alarm with voltage on port and an alarm when the circuit open.

If I can do this, I can control if a external system is switched on or off.

Someaone has any ideas?

Bye
Mirko

 

[MirkoGradassi]

Nothing, I've sole it

Thanks
Byes