Allen-Bradley 1756-IB16I 16-Point DC Input Module

Allen-Bradley 1756-IB16I is a ControlLogix 16-point DC input module that provides sixteen independently isolated 24V DC digital inputs for the 1756 I/O backplane. It accepts nominal 24V DC input signals with a practical operating range of 10–30V DC and draws about 3 mA per module at 24V, with a total backplane power of 0.58 W. Each input is isolated (250V continuous) from the backplane and from other channels, supporting robust protection in mixed-voltage environments. The IB16I is part of the ControlLogix DC input family and uses removable terminal blocks (typically 1756-TBCH) for field wiring. It features an off-state voltage up to 5V and an off-state current up to 1.5 mA; on-state current ranges from a minimum 2 mA at 10V to a maximum 10 mA at 30V, with input impedance around 3 kΩ at 30V. Inrush current is up to 250 mA peak, and the device supports software-configurable input timing and small hardware delays to help debounce noisy signals. This module integrates with standard ControlLogix backplanes for high-density digital input, enabling reliable monitoring of sensors, switches, and other 24V DC devices in automation applications.