Allen-Bradley’s 1746-IV8 is an 8-channel DC digital input module. The voltage rating of the module lies at 24V DC. It is a general purpose input module with a wide range of industrial applications. The operating voltage of the module ranges from 10 to 30 VDC. The source input is sink load. Special features for the 1746-IV8 input module include off-state maximum current rating of 1 milliampere, 8-channel input, and self-lifting terminal plate. It has a backplane current load of 50 milliamperes at 5 Volts and is part of the SLC 500 digital module series. The 1746-IV8 includes LED indicators for status updates and features two (2) #14 AWG cables. For both on and off states, the maximum signal delay is 8 milliseconds.

The 1746-IV8 digital input module has a power rating of 0.2 Watts per point. The minimum thermal dissipation limits to 0.25 Watts and the maximum thermal dissipation limits to 1.9 Watts. The nominal input current lies at 8 mA (at the voltage rating of 24 Volts DC). Important notes that should be provided to the operator include warnings that the user ensures that power is OFF before setting up or installing the input module. There are chances of electrical glitches if the module is ON while installing. When considering the functionality of the 1746-IV8, frequent and repeated electrical arcs lead to poor performance. The contacts on the SLC module will get damaged due to electrical arcs. The 1746-IV8 contains no removable terminal blocks. The operational maximum shock of the input module is 30 grams. The non-operational maximum shock is 50 grams. The non-condensing relative humidity lies between 5 and 95%. The 1746-IV8 input module is a standard and non-flex type module exclusive for programmable controllers. The module follows a chassis mounting. The operating temperature of the input module ranges from 0 to 60 °C.