Input protection

[wchpikus]

Hello
One of binary input stop working..
I checked and translator was damage.
I do not know-how how, but it could be protect emc or overload. 
I just replace them, but I wojny about induction when I will connect them to 20m ftp.

[admin]

what input signal you have connected? which board model you are using?

[wchpikus]

Kc-a16.
One of input stop working..I tester and translator damage.
On schematic is only resistor on input, but it can be failed part..

Gdn input offcourse.

[admin]

do you have replaced translator? now whether work well?

[wchpikus]

do you have replaced translator? now whether work well?

I do not have this model transoptor, but behand translator logic work (tested)
Only translator stop working.

Ps..my dictionary change transoptor (optocoupler) word to translator...now I see it

[admin]

IC: EL357 optocoupler chip, just replace it.