1734-IV8 | Allen-Bradley Point I/O 8-Point Digital Input Module

The 1734-IV8 is a digital DC sourcing input module used in industrial automation to detect and transmit input signals from field devices to a control system. It provides eight sourcing input channels that operate with 24V DC signals, making it ideal for interfacing with sensors, switches, and other digital input devices. It is part of the Allen-Bradley POINT I/O family, known for its compact size and modularity. This module is typically installed in distributed I/O systems where space efficiency and flexible wiring are required. Its sourcing input design means it provides current to the field device, expecting a ground return when the input is activated. The module transmits these ON/OFF signals to a central PLC or controller for processing. It is widely used in packaging, assembly, and small machine control applications. With its reliable performance and diagnostic features, the 1734-IV8 improves system responsiveness and fault detection.

The 1734-IV8 module features 8 discrete sourcing digital inputs, allowing it to connect with up to eight field devices. Each input is independently monitored and indicated by a corresponding yellow status LED. This modular design helps in compact installations and facilitates diagnostics during operation. The inputs are grouped logically, making configuration and wiring straightforward when integrating with PLCs. It is particularly effective for applications that require monitoring multiple digital states such as proximity sensors or pushbuttons. The individual inputs can be scanned rapidly, supporting high-speed logic functions. Additionally, the module’s change-of-state feature enhances responsiveness by transmitting data only when input state changes. This reduces network traffic and improves control system efficiency.

The maximum input current for the 1734-IV8 module is 5 milliamps per input at 28.8V DC. This current level ensures a clear logic high signal and reliable detection by the controller. The module supports ON-state current as low as 2 mA, making it compatible with a wide range of field devices. It is designed for low-power operation while maintaining high sensitivity to input signal changes. Input current ratings are important for ensuring proper operation of both the input device and the module itself. If the input current falls below the minimum threshold, the input may not register as “ON” in the system. For safe and efficient use, ensure all connected field devices meet these electrical characteristics. These values also help in calculating total system load and power dissipation.

Yes, the 1734-IV8 supports Removal and Insertion Under Power (RIUP), which means the module can be safely installed or removed without powering down the entire system. This feature is highly beneficial in minimizing system downtime during maintenance or replacement. RIUP is especially useful in modular architectures where I/O modules are often changed or added. The system detects the presence or removal of the module and logs it, preventing system faults. This capability does not interrupt neighboring modules, as the POINTBus connection handles module hot-swapping securely. While RIUP is supported, users should always observe electrostatic discharge precautions during handling. Additionally, terminal wiring remains undisturbed as the module connects to fixed terminal bases. This ensures rapid and error-free replacement in industrial environments.

Yes, as of 2025, the Allen-Bradley 1734-IV8 is still in active production and supported by Rockwell Automation. It remains part of the widely used POINT I/O product line, which is popular for distributed I/O applications. The module benefits from continued firmware updates and full integration with Studio 5000 Logix Designer. It is compatible with newer CompactLogix and ControlLogix controllers over EtherNet/IP networks. The availability of accessories such as terminal bases (1734-TB, 1734-TBS) further supports its use in new installations. In addition, the module is compliant with global industrial standards, ensuring availability in many regions. Its reliability and compact design keep it in demand across various industries. However, it is recommended to consult Rockwell’s official lifecycle status portal or authorized distributor to confirm the latest manufacturing status.