Allen-Bradley/Rockwell Automation 1771-IH digital DC input module

The Allen-Bradley 1771-IH is a digital DC input module. It has 8 inputs available and comes with an input voltage range of 24-50V DC. It has a voltage category of 10-60V DC sink (source load). The nominal input currents of this module are 8.4 mA at 24V DC and 20 mA at 48V DC. This module also has a maximum on-state voltage of 10V DC, a maximum off-state voltage 4.5V DC, and maximum off-state current of 1 mA. It also has a maximum input impedance of 2.5-3K Ω for an on-state and a maximum of 5-6K Ω for an off-state. Eight red status indicators are available with the 1771-IH module. It is rack mountable and has a 1771-WD wiring arm.

Input signal delays are present with this module. In particular, it has low to high and high to low propagation delays of 15 ms with +/- 7 ms each. It has a backplane current of 74 mA at 5V DC +/- 5% and an isolation voltage of 1500V AC RMS. This module has a power dissipation that ranges from a minimum of 0.4 W to a maximum of 8.1 W and a thermal dissipation that ranges from a minimum of 1.3 BTU/hr and a maximum of 27.7 BTU/hr. Its operating temperature is 0-60.

Technical specifications for 1771-IH

ManufacturerRockwell Automation

BrandAllen-Bradley

Part Number/Catalog No.1771-IH

Module TypeDigital DC Input Module

Number of Inputs8 Inputs

Voltage Category10-60 Volts DC, Sink (Source Load)

DC Operating Voltage24-50 Volts

Backplane Current74 Miliamperes

Max DC Off-State Current0.7 Miliamperes

Typical DC Signal Delay (On)15 (+/- 7) ms

Typical DC Signal Delay (Off)20 (+/- 9) ms

Wiring Arm1771-WA

Model StatusEarlier Model

Typical AC Signal Delay (Off)24 (+/- 10) ms

MountingRack Mountable