Use two different digital outputs from two different cards to control a horn

Hi ,

I want to use two different digital outputs from two different cards to control a horn. This is placed in zone 2 and I placed two diodes right at each output to protect the output. the challenge is that the diodes are not zone 2 approved. What I'm wondering is that if I connect two digital outputs together without an external diode, can I destroy the output with reverse voltage? or does the card have an internal protection?

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Split from Digital output module reverse polarity .

AutoGen_2504070

Hi ,

I want to use two different digital outputs from two different cards to control a horn. This is placed in zone 2 and I placed two diodes right at each output to protect the output. the challenge is that the diodes are not zone 2 approved. What I'm wondering is that if I connect two digital outputs together without an external diode, can I destroy the output with reverse voltage? or does the card have an internal protection?

Hi,

Are you using separate relays in the outputs of digital outputs , If yes, than you can use two digital outputs signal for a single hooter. Through two separate digital outputs signals, you can operate two relays and output of these relays(Common, NO) you merge in single output.

Regards,

AutoGen_2504070

Hi ,

I want to use two different digital outputs from two different cards to control a horn. This is placed in zone 2 and I placed two diodes right at each output to protect the output. the challenge is that the diodes are not zone 2 approved. What I'm wondering is that if I connect two digital outputs together without an external diode, can I destroy the output with reverse voltage? or does the card have an internal protection?

------------------------------------------------------------------------------------------
Split from Digital output module reverse polarity .

 Hello,

The better to use only 1 DO signal with the two conditions programmed in the CPU. So the network to energize this DO signal have two branches (one brach for each condition)