1771-IAD

Overview

1771-IAD is a 16-point AC/DC (120V) input module from Allen-Bradley’s 1771 I/O series. It provides reliable signal interfacing between field devices and PLC processors in industrial control systems.

Electrical Characteristics

• Inputs per Module: 16

• Nominal Input Voltage: 120V AC @ 50/60Hz; 125V DC

• Nominal Input Current: 9.9mA @ 120V AC 60Hz; 8.7mA @ 120V AC 50Hz; 2.56mA @ 125V DC

• On-State Voltage Range: 79V to 138V AC or DC

• Minimum On-State Current: 5.95mA @ 79V AC 60Hz; 1.5mA @ 79V DC

• Maximum Off-State Voltage: 43V AC or DC

• Maximum Off-State Current: 3.0mA @ 43V AC 60Hz; 0.8mA @ 43V DC

• Input Impedance: 11.2KΩ @ 60Hz (0.18µF parallel with 47KΩ, in series with 820Ω)

• Peak Inrush Current: VPS/820Ω (where VPS = customer supply peak voltage)

Response and Power Data

• Input Signal Delay (Off→On / On→Off):

• 5ms (+3ms) or 20ms (+5ms) @ 120V AC 60Hz selectable

• 3ms (+0.1ms) or 10ms (+1ms) @ 120V DC selectable

• 25ms (+5ms) @ 120V AC or DC

• Power Dissipation: 8.8W (max.), 1.0W (min.)

• Thermal Dissipation: 30.1 BTU/hr (max.), 3.42 BTU/hr (min.)

• Backplane Current: 195mA @ 5V

Isolation and Installation

• Isolation Voltage: Tested to 2500V DC for 1s (UL508 & CSA C22.2 #142)

• Module Location: 1771 Series B or later I/O chassis, 1771-AM1/-AM2 chassis

• Keying: Between 10–12 and 14–16

Environmental and Wiring Data

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to 85°C (-40°F to 185°F)

• Relative Humidity: 5–95% non-condensing

• Wire Size: 14 AWG stranded max.

• Insulation: 3/64 inch (1.2mm) max.

• Field Wiring Arm: 1771-WH

• Wiring Arm Screw Torque: 7–9 in-lb

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