Wondering what the concerns would be with directly switching loads using discrete SNAP I/O with optical isolation such as the SNAP-ODC5-i or SNAP-ODC5SRC? Is there ever a reason to use interposing relays if SNAP I/O can accommodate necessary switching voltage and current? I know these are only rated to switch 3 amps on the field side. It would seem relays are a likelier source of failure if they are electromechanical vs. the optically-isolated solid state SNAP I/O. The loads in question vary from 5V dry contact logic inputs to 24VDC lamps and a 24VDC signaling horn. Just wondering if there are concerns with certain types of loads and what the best practices are. Thanks.