1791-16B0 | Allen Bradley | Block I/O 16-Point DC Digital Input Module

Product Overview

The Allen Bradley 1791-16B0 functions as a high-density standalone interface for DC digital field devices. This 16-point input block eliminates the need for separate chassis and backplanes by integrating power, communication, and I/O into a single ruggedized unit. It interfaces seamlessly with controllers to monitor limit switches, proximity sensors, and pushbuttons. We supply this unit as 100% Brand New, ensuring the highest level of signal accuracy and mechanical durability for your automation network.

Technical Specifications

The 1791-16B0 features two groups of eight inputs, providing a compact footprint for 24V DC signaling.

Engineering Advantages

• Optimized Signal Diagnostics: Individual Status LEDs provide real-time visual feedback for every input channel. This feature allows maintenance teams to verify field-side sensor health instantly without connecting a laptop, significantly reducing troubleshooting time.

• Superior Environmental Tolerance: The module operates reliably in temperatures up to 60°C and maintains performance in humidity levels up to 95%. This robustness makes it ideal for non-climate-controlled factory floors or cabinets situated near high-heat process equipment.

• Flexible Field Wiring: The terminal blocks accept up to 14 AWG wire. This heavy-gauge capacity prevents voltage drops over long cable runs and provides superior mechanical strength at the connection point, resisting wire pull-out in high-vibration environments.

• Compact Block Architecture: The 1791-16B0 integrates its own power supply and communication adapter. This design saves significant DIN rail space compared to traditional rack-mounted I/O, making it the preferred choice for retrofitting small junction boxes or adding I/O points to crowded control panels.

FAQs

• Can the 1791-16B0 handle high-speed pulse inputs?

  The 1791-16B0 specifically targets standard discrete signaling (limit switches, pushbuttons). While it handles rapid on/off states, you should verify the scan time of your RIO (Remote I/O) link and the module's internal filtering to ensure it captures extremely short-duration pulses typical of high-speed encoders.

• Does this block require a separate communication adapter?

  No. The 1791 Block I/O series contains the communication interface within the housing. You connect the Remote I/O (RIO) cable directly to the block, allowing the PLC to address the 16 inputs as a standard I/O rack.

• What is the significance of the 2-group-of-8 architecture?

  This grouping allows you to use two different power sources (commons) for the inputs if necessary. This electrical isolation between groups prevents a fault in one field-side circuit from disabling the entire 16-point block.

• How does the 11.1W power dissipation affect my enclosure design?

  The 38 BTU/hr thermal dissipation requires adequate cabinet ventilation. If you mount multiple 1791-16B0 blocks in a single unventilated enclosure, calculate the total heat rise to ensure the internal temperature remains below the 60°C operating limit.