The Allen Bradley 1769-RTBN18 is a Rockwell Automation module designed for use with their 1769 CompactLogix PLC system. This module is a part of the 1769 I/O series and is specifically an 8-channel high-speed digital DC input module.

The 1769-RTBN18 module provides input points for monitoring the state of DC voltage sources such as switches, sensors, or other discrete devices. It has eight discrete input channels that can accept a range of voltage levels, typically 10-30V DC. These input channels are isolated from each other and have a common power supply.

The module is designed for applications where high-speed input scanning is required, such as high-speed counting or monitoring fast-changing signals. It offers a fast input response time and supports input filter options to reduce noise and improve signal stability.

To use the 1769-RTBN18 module, you would typically connect your DC voltage sources to the input channels and configure the module's settings using Rockwell Automation's programming software, such as RSLogix 5000. You can program the PLC to respond to changes in the input signals and trigger appropriate actions or control outputs based on the input states.

It's worth noting that the 1769-RTBN18 module requires a compatible backplane and power supply to operate within the CompactLogix system.