2-channel Counter/Frequency Input Module. The I-87082W offers 2 high speed counter or frequency input channels and 2 digital output channels. Two types of digital inputs are provided, one for isolated input and one is for non-isolated input. The isolated input provides 3750 Vrms isolation voltage and the non-isolated input provides programmable threshold voltage level. The built-in digital filter is valid for both non-isolated and isolated input ..