The Allen-Bradley 1746-IO4 is a digital I/O combination module from Rockwell Automation designed for the SLC 500 series, offering two inputs and two outputs with an operating voltage of 85-132V AC. This unit has a signal delay of 35-45 milliseconds and supports applications requiring combination 120V AC I/O, with a current/output capacity of 1.2A at 24VDC and 1.5A at 120VAC. Manufacturer Rockwell Automation Brand Allen-Bradley Part Number/Catalog No. 1746-IO4 Series SLC 500 Module Type Digital I/O Combination Module Operating Voltage 85-132 Volts AC Inputs 2 Outputs 2 Signal delay 35-45 milliseconds Current/Output (24VDC) 1.2 amps Current/Output (120 VAC) 1.5 amps Backplane Current 25-30 milliamps Applications Combination 120 Volts AC I/O UPC 10662073521300