The Allen-Bradley 1797-OB4D non-isolated source output module features a fault indication function, and in this case, the status indicator will blink red for any fault that has been detected. This output module has the ability to detect short circuits and output wire off per channel by using a module data bit. The Allen-Bradley non-isolated source output module is electronically protected against short circuits and it can report faults directly to the controller. The recommended conditions for its use are an operating temperature range from 0 to 50 degrees Celsius and a relative humidity range of 5 to 95% without condensing. An altitude of 1000 meters is also recommended. The approximate dimensions of the 1797-OB4D module are as it follows: it has a width of 46 millimeters, a height of 94 millimeters, and a depth of 75 millimeters.