I have a question about overload protection for I/O modules 120v and 24v. I was curious to see is there any reason to protect a input considering it typically has no load on it. Would you protect a 4-20 ma circuit? What brought this up is I was wanting to protect a set of rNO relay contacts going to a 1756-IA161 input card. I couldn't find much on max current for the I/O but it look liked it was rated for 15ma max current with a load. Which is .015 amps. Is there any material to give me a base idea on protecting I/O modules? Thanks