1771-OB

The Allen Bradley 1771-OB is a DC Output Driver Module that can control DC motor starters, indicators, and solenoids. It receives electric power through the 1771 I/O backplane chassis from the power supply casing and requires 165 mA from the output of this supply. The unit is shipped in a static protective bag to help protect against damage to electrostatic discharge. Electrostatic discharge can, in some cases, decrease the performance or damage of the module. Remember to wear an approved ground earthing hook device or to touch a grounded object to detach before handling the module.

With 8 outputs and an input voltage range of 10 to 27  Volts DC, the 1771-OB has an output current of 1.5 A per output (not to exceed 8 A per module). Its maximum surge current is 4 A for 1 millisecond and is repeatable every 1 second.

The Off-state Leakage Current for this unit is 1 mA per output, while its On-state Voltage Drop is 2 Volts DC.

With a delay time of 10 milliseconds, this module’s power dissipation is 16.9 Watts (maximum) and 0.9 Watts (minimum); its thermal dissipation is 57.6 BTU/hour (maximum) and 3.0 BTU/hour (minimum).

When in a non-operative state, this module’s temperature stays between -40 and 185 degrees Fahrenheit (-40 to 85 degrees Celsius), and when operating, it stays between 32 and 140 degrees Fahrenheit (0 and 60 degrees Celsius). In addition, this unit can hold a relative humidity between 5% and 95% without condensation.