Introduction
Is your control panel bursting at the seams? The Allen-Bradley 1734-IB4 offers a compact, cost-effective solution for adding four sinking input channels to your distributed I/O architecture. As part of the POINT I/O family, this digital DC sinking input module packs reliable performance into a mere 12 mm width, saving valuable DIN rail space. Whether you’re building a new system or upgrading an existing one, the 1734-IB4 delivers the trusted quality of Allen-Bradley in a space-saving package.
Technical Specifications
The 1734-IB4 operates with a field power voltage range of 10-28.8V DC and provides four sinking input channels. Each channel draws a maximum input current of 5 mA, with a nominal on-state current of 4 mA and a minimum of 2 mA. The module’s on-state voltage ranges from 10V DC minimum to 28.8V DC maximum, with a nominal 24V DC. Off-state voltage maxes out at 5V DC, and off-state current is at least 1.5 mA. Input impedance is nominally 3.6 kΩ, max 4.7 kΩ. The module consumes 75 mA from the POINTBus at 5V DC and dissipates 1 W (3.4 BTU/hr). It features a user-selectable input filter time of 0.5 ms hardware plus 0…63 ms. Isolation voltage is 50V continuous. The 1734-IB4 measures 56 x 12 x 75.5 mm and weighs approximately 31.8 g. It has an open-style enclosure and a keyswitch position of 1.
Comparison with Similar Modules
When selecting a digital input module, it’s helpful to compare key attributes. The 1734-IB4 offers four sinking inputs in a compact 12 mm width. Other modules in the POINT I/O family may have different channel counts or input types (sinking vs. sourcing). The 1734-IB4’s 5 mA input current is relatively low, making it suitable for applications where power consumption is a concern. Its wide voltage range (10-28.8V DC) provides flexibility in 12V and 24V systems. Unlike some larger form-factor modules, the 1734-IB4 is designed for high-density installations where space is at a premium. Always verify compatibility with your specific adapter and power requirements.
Industry Applications
The 1734-IB4 excels in distributed I/O systems across various industries. In manufacturing, it can monitor limit switches, pushbuttons, and proximity sensors on conveyor lines. Its sinking inputs are ideal for NPN-type sensors. In material handling, the module can interface with photoeyes and encoders to track product movement. The compact size allows installation in tight machine-mounted enclosures. For building automation, it can read status contacts from HVAC equipment or lighting panels. The 0.5 ms hardware filter plus user-selectable software filtering helps reject noise in electrically noisy environments, ensuring reliable signal detection.
Installation and Setup
Mounting the 1734-IB4 is straightforward. Use a zinc-plated, yellow chromate steel DIN rail; avoid aluminum or plastic rails that may corrode and cause poor grounding. Secure the rail to the panel approximately every 200 mm (7.8 inches) using appropriate anchors. The module connects to the POINTBus via a communication adapter from the same 1734 POINT I/O family. All field wiring terminates at the removable terminal block (RTB) at the bottom of the module. The 1734-IB4 supports both 2-wire and 3-wire input signals. Ensure the adapter supplies sufficient POINTBus current (75 mA at 5V DC per module). The front panel provides clear status indicators for module health, network status, and each input channel, simplifying troubleshooting.
Maintenance and Reliability
The 1734-IB4 is designed for long-term reliability with no moving parts. Regular inspections should include checking for loose wiring, verifying LED status, and ensuring the DIN rail and module are free from contamination. The open-style enclosure requires a clean, dry environment within the panel. The module’s low power dissipation (1 W) minimizes heat buildup, extending component life. For maximum uptime, keep spare modules on hand. SpareTechPLC offers fast availability to minimize downtime.
Compatibility and Integration
The 1734-IB4 requires a 1734 POINT I/O communication adapter, such as those for EtherNet/IP, ControlNet, or DeviceNet networks. It integrates seamlessly with Allen-Bradley PLCs and other controllers that support these networks. The module’s local I/O register maps input data to the host controller over the selected network. It can be mixed with other POINT I/O modules on the same adapter, allowing flexible system design. Verify that your adapter’s power budget can supply the required POINTBus current for all connected modules.
Selection Guide
Before purchasing the 1734-IB4, confirm your system uses sinking (NPN) input devices and that your field power is within 10-28.8V DC. Check that you have a compatible 1734 POINT I/O adapter and sufficient POINTBus current capacity. Consider the number of input channels needed; the 1734-IB4 provides four. If you require sourcing inputs, look for a different module. For reliable supply and expert support, SpareTechPLC is your trusted source for Allen-Bradley POINT I/O components. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Frequently Asked Questions
What is the difference between sinking and sourcing inputs?
Sinking inputs connect to sensors that switch the ground path (NPN), while sourcing inputs connect to sensors that switch the positive voltage (PNP). The 1734-IB4 is a sinking input module.
Can I use the 1734-IB4 without a communication adapter?
No, the 1734-IB4 requires a 1734 POINT I/O communication adapter to interface with the controller and provide POINTBus power.
What is the maximum input current per channel?
The maximum input current is 5 mA per channel, with a nominal on-state current of 4 mA.
How do I set the input filter time?
The input filter time is user-selectable from 0 to 63 ms, in addition to a 0.5 ms hardware filter. Configuration is typically done through your programming software.
What is the isolation voltage of the 1734-IB4?
The module provides 50V continuous isolation between field and logic sides.
