Allen-Bradley 1734-IB2 24V DC Sinking Input Module

1734-IB2 Product Introduction

The Allen-Bradley 1734-IB2 digital DC sinking input module offers a compact and efficient solution for monitoring 24V DC field devices within the POINT I/O architecture. This module provides two (2) sinking input channels that interface with sensors, pushbuttons, and other DC signal sources commonly found in industrial environments. Specifically, the 1734-IB2 uses a sink wiring configuration, which means the input circuit connects to the negative side of the DC supply. Its compact footprint measures only 56 x 12 x 75.5 millimeters, making it ideal for space-constrained control panels. Additionally, the 1734-IB2 features individual LED indicators for each channel, giving operators immediate visual feedback on input status. The module supports key switch position 1 on its mounting base, simplifying addressing in multi-module systems. Furthermore, the 1734-IB2 integrates seamlessly with popular industrial networks, including EtherNet/IP, DeviceNet, and ControlNet, through compatible POINT I/O adapters.

Technical Specifications 1734-IB2

Understanding the electrical parameters of the 1734-IB2 is crucial for proper system integration. First, this module operates at a nominal input voltage of 24 Volts DC, with an acceptable range from 10 to 28.8 Volts DC. The maximum input current per channel is 5 milliamps, which ensures low power consumption and minimal heat generation. Moreover, the 1734-IB2 draws a POINTBus current of 75 milliamps at 5 Volts DC from the backplane. This modest current requirement allows multiple modules to share the same power supply without exceeding the system budget. The power dissipation is rated at 0.7 Watts maximum at 28.8 Volts DC, while thermal dissipation reaches approximately 2.4 BTU/hour.

Furthermore, the Allen-Bradley 1734-IB2 exhibits reliable electrical characteristics for industrial environments. The module provides a nominal input impedance that ensures compatibility with most 24V DC sensors. It features non-isolated inputs, meaning all channels share a common return path, which simplifies wiring in many applications. The module's sinking configuration requires the field device to source current to the input, making it suitable for use with PNP-type sensors commonly found in DC control systems. The on-state voltage threshold ensures reliable detection of valid signals, while the off-state voltage tolerance prevents false triggering from leakage currents.

Mechanical and Environmental Parameters 1734-IB2

The 1734-IB2 module offers practical mechanical specifications that facilitate easy installation. Its physical dimensions are 56.0 x 12.0 x 75.5 millimeters (2.21 x 0.47 x 2.97 inches), making it one of the slimmest modules in the POINT I/O family. Weighing only 30.9 grams (1.09 ounces), this lightweight design minimizes strain on DIN rails and mounting hardware. The open-style enclosure requires installation within a protected control panel, as it does not carry an IP rating. Nevertheless, the 1734-IB2 operates reliably across a wide temperature range from -20 to 55 degrees Celsius (-4 to 131 degrees Fahrenheit). This broad operating range makes the module suitable for various industrial settings, from cold storage facilities to warm manufacturing plants. Moreover, the module can be mounted either horizontally or vertically, providing flexibility during panel layout design.

Installation Guidelines

Proper installation of the Allen-Bradley 1734-IB2 ensures reliable operation and long service life. Begin by selecting a compatible mounting base, such as 1734-TB or 1734-TBS, and attach it securely to a standard DIN rail. Next, set the keyswitch on the base to position 1, as required for this module. Then, snap the 1734-IB2 module onto the base until it locks firmly into place. For field wiring, connect the 24V DC supply to the appropriate terminals on the base, observing correct polarity. Each input channel accepts one signal wire from the field device, with a common return for all channels. After completing all wiring, apply power and verify that the module status LED illuminates. Subsequently, test each input by energizing the connected field device and confirming the corresponding channel LED turns on. Always follow local electrical safety codes when working with DC circuits.

Packaging List

When you receive your Allen-Bradley 1734-IB2, the package includes the following items:

• One 1734-IB2 24V DC sinking input module

• One removable terminal block (depending on base variant)

• One set of labeling strips for channel identification

Please note that the mounting base (such as 1734-TB or 1734-TBS) is not included and must be ordered separately. The package also does not include cables, power supplies, or network adapters. All components are shipped in anti-static packaging to prevent electrostatic discharge damage during transit.

Shipping Information

We dispatch all orders using premium express courier services. Specifically, we ship via FedEx, UPS, or DHL, depending on your delivery location and service preference. Every shipment includes a tracking number so you can monitor your package in real time. Typically, orders placed before 2:00 PM local time are shipped on the same business day. For international deliveries, please allow additional time for customs clearance and local handling.

Frequently Asked Questions

1. Is the 1734-IB2 compatible with 120V AC input signals?
No. The 1734-IB2 is designed exclusively for 24V DC sinking inputs. Applying AC voltage may cause permanent damage to the module. For AC applications, consider modules such as the 1734-IA2 or 1734-IA4.

2. What keyswitch position does the 1734-IB2 require?
The 1734-IB2 requires the keyswitch on the mounting base to be set to position 1. This ensures proper addressing and communication with the system backplane.

3. Can the 1734-IB2 be used with PNP sensors?
Yes. Since the 1734-IB2 is a sinking input module, it works correctly with PNP sensors that source current to the input channel. The sensor supplies the positive voltage, and the module provides the return path to ground.

4. How many 1734-IB2 modules can I install in one system?
The number of 1734-IB2 modules depends on the power budget and I/O capacity of your POINT I/O adapter and host processor. Each module draws 75 mA from the 5V backplane, so you can calculate the maximum quantity based on your adapter's current rating.

5. What does the LED indicator show on the 1734-IB2?
Each input channel on the 1734-IB2 has a dedicated LED. When the channel detects a valid on-state voltage (within the 10-28.8V DC range), the LED illuminates. A dark LED indicates the input is off or below the threshold voltage.