Allen-Bradley 1719-A24 Distributed Ex I/O 24 Position Backplane

Product Overview

The Allen-Bradley 1719-A24 is a high-density, 24-slot chassis backplane engineered for the 1719 Ex I/O distributed I/O platform. This robust backplane serves as the foundation for intrinsically safe I/O systems, providing a high-speed communication path and power distribution for up to 24 functional modules. 

Technical Configuration

• Manufacturer: Allen-Bradley (Rockwell Automation)
• Full Model: 1719-A24
• Slot Capacity: 24 Single-width I/O Slots
• Input Voltage Range: 18 to 32 Volts DC (24V DC Nominal)
• Power Consumption: 12 Watts Maximum
• Platform: 1719 Ex I/O Chassis-based System
• Enclosure Rating: Suitable for harsh industrial conditions

Technical Specifications

Key Features & Operational Benefits

1. Maximum Modular Scalability: With 24 available slots, the 1719-A24 offers the highest density in the 1719 series. It allows for the integration of a wide range of digital and analog I/O modules, temperature inputs (RTD/TC), and specialized counter modules within a single, unified backplane, reducing footprint and wiring complexity.

2. Industrial-Grade Reliability: Built to withstand extreme environmental variables, this backplane operates across a wide temperature spectrum (-20°C to 70°C). Its sturdy 1.8 kg construction ensures a stable mounting platform for sensitive electronics, protecting them from industrial vibration and mechanical stress.

3. Efficient Power Distribution: The backplane consumes only 12W of power for its internal operations, effectively distributing the 24V DC input voltage to all connected modules. This minimizes heat generation within the enclosure, which is critical for maintaining high reliability in non-ventilated or hazardous area cabinets.

Installation Guidelines

Mounting: Ensure the mounting surface is clean and capable of supporting the combined weight of the backplane and all 24 modules. The unit is designed for secure panel mounting. Follow the specified clearance guidelines to allow for adequate heat dissipation and module accessibility.

Power Connection: Connect the 18-32V DC power source using appropriately sized conductors. Ensure the polarity is correct and that the power supply provides sufficient current for both the backplane and the peak load of all populated modules.

Module Integration: Insert I/O modules into the slots with firm pressure until they click into place. Each slot provides self-coding features to prevent the insertion of incorrect module types once the system has been configured, enhancing maintenance safety.

Technical FAQs

Q: Can I use this backplane for non-Ex applications?
A: Yes, while optimized for Ex I/O zones, the 1719-A24 provides a robust 24-slot solution for any application requiring high-density distributed I/O with isolation.

Q: Does the 1719-A24 include a built-in communication adapter?
A: No, the 1719-A24 is a passive backplane. You must install a 1719 communication adapter (such as an EtherNet/IP adapter) into the designated slots to enable network connectivity.

Q: What is the benefit of the high humidity rating?
A: The 5% to 95% non-condensing rating makes it suitable for diverse global environments, from dry desert climates to humid coastal processing facilities, provided the enclosure meets the required environmental sealing.