The F-8040 features 32 digital input (sink/source) channels. Either sink- or source-type input can be selected via different wiring. The F-8040 can determine binary input from a DC voltage source. The digital input channels also offer LED indicators to locally display digital input status. Moreover, the module offers 3000 VDC optical isolation between channels and backplane bus. If any high voltage or current damages the channels, the system (backplanes, other modules, and control unit) won't be affected because the benefit of isolation.