1771-DB/A

Overview

Allen-Bradley 1771-DB/A is a basic module for PLC applications, providing isolated programming and peripheral ports with precise communication and math capabilities.

Isolation

• Programming port vs. backplane: +500 V

• Peripheral port vs. backplane: +500 V

• Programming port vs. peripheral port: +500 V

Communication

• Rates: 300, 600, 1200, 2400, 4800, 9600, 19.2 K bits

• Driver/receiver: Drive output +3.6 V min, receiver sensitivity 200 mV min

Accuracy and Math

• Wall-clock accuracy: ±5 min/month @ 25 °C

• Drift: ±50 ppm/°C, ±50 ppm/year @ 25 °C

• Math precision: 8 significant digits

• Number formats: Integer, decimal, hexadecimal, exponential

• Range: ±1E-127 to ±9.9999999E+127

Installation and Power

• Module location: One 1771 I/O chassis slot

• Backplane power supply load: 1.5 A

Environmental Conditions

• Operating temperature: 0–60 °C (32–140 °F)

• Storage temperature: -40–85 °C (-40–185 °F)

• Relative humidity: 5–95% (non-condensing)

• Keying (top backplane connector): Between 8 and 10

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