The digital DC output module 1771-OBN from Allen Bradley is provided as an open device and is not suitable for industrial environments greater than pollution 2 when applied in zone 2 environments. It can only be accessed by using the device, as it contains components that are susceptible to damage from electrostatic discharge. The contact electrostatic discharge is 4 kV and the air electrostatic discharge is 8 kV.
The isolation voltage of the unit is approximately 1500 volts AC RMS; It comes with four sets of eight outputs for a total of thirty-two (32) outputs in the output voltage range between 10 and 30 volts DC supply; The output current rating is 0.5 A per output, the maximum backplane current is 330 mA (5 volts DC), and the isolation voltage is tested for 60 seconds and can withstand voltages up to 500 volts.
The 1771-OBN unit has A maximum "ON" voltage drop of 1.5 V DC supply at 0.5 A, while its maximum "OFF" leakage current is 1 mA per output. It has a maximum power consumption of about 13.7 watts, a minimum power consumption of about 1.7 watts, and its heat dissipation ranges from a maximum of 46.7 BTU per hour to a minimum of 5.7 BTU per hour.
The device can be stored at any temperature between -40 and 185 degrees Fahrenheit (-40 and 85 degrees Celsius) and operated at temperatures between 32 and 140 degrees Fahrenheit (0 and 60 degrees Celsius). It can withstand relative humidity of approximately 5% to 95% without condensation and has four 4.0-A, 250-volt normal blown fuses (1 per set).
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