Allen-Bradley 1734-IB4 POINT I/O Digital DC Sinking Input Module

What Is the Allen-Bradley 1734-IB4?

When your automation system demands reliable, space-saving input modules for discrete signals, the Allen-Bradley 1734-IB4 provides a proven solution. This digital DC sinking input module belongs to the POINT I/O family and features four sinking input channels operating at 12/24VDC. It works seamlessly with any POINT I/O communication adapter and POINTBlock IO modules to implement distributed I/O architectures. The module consumes 1 Watt of power and draws a maximum input current of 5 mA per channel.

Technical Specifications Breakdown

Understanding the key parameters helps you integrate the 1734-IB4 correctly. The module accepts an input voltage of 24 Volts DC with a field power voltage range of 10-28.8V DC. Its on-state voltage ranges from a minimum of 10V DC to a maximum of 28.8V DC, with a nominal value of 24V DC. The on-state current varies from 2 mA minimum to 5 mA maximum, with a nominal 4 mA. Off-state characteristics include a maximum off-state voltage of 5V DC and a minimum off-state current of 1.5 mA. Input impedance ranges from 3.6 kΩ nominal to 4.7 kΩ maximum. The input filter time is 0.5 ms hardware plus 0...63 ms user-selectable. Power dissipation is 1 Watt (3.4 BTU/hour), and the POINTBus current is 75 milliamps at 5V DC. Isolation voltage is 50V continuous. The module weighs approximately 31.8 g (1.12 oz) and measures 56 x 12 x 75.5 mm (2.2 x 0.47 x 2.97 in.). It has an open-style enclosure rating and a keyswitch position of 1.

Industry Applications

The 1734-IB4 excels in applications requiring discrete input sensing in manufacturing, packaging, material handling, and process control. For example, in a conveyor system, it can monitor presence sensors or limit switches. Its compact form factor saves valuable panel space, and the ability to use two-wire or three-wire input signals offers flexibility. The module's 0.5 ms hardware filter plus user-selectable software filter helps reject noise in electrically harsh environments, reducing false triggers and improving system reliability.

Installation & Setup Guidance

Mount the 1734-IB4 on a DIN rail using zinc plate, yellow chromate steel rail. Avoid aluminum or plastic rails as they may corrode or cause poor grounding. Secure the DIN rail to the mounting surface every 200 mm (7.8 inches) with appropriate anchors. All field wiring connects to the removable terminal block (RTB) at the bottom of the module. Use a compatible POINT I/O communication adapter to power the module via the POINTBus. The front panel provides four yellow input status indicators, plus module and network status LEDs for quick diagnostics.

Maintenance & Reliability

Routine inspection of the 1734-IB4 involves checking the status indicators for normal operation. Verify that the DIN rail mounting remains secure and that the terminal block connections are tight. The module's open-style enclosure requires a clean, dry environment. Periodic testing of input channels against known signal sources helps confirm proper function. Follow the manufacturer's guidelines for any maintenance procedures.

Compatibility & Integration

The 1734-IB4 integrates with any POINT I/O communication adapter from the same 1734 family. The adapter hosts the network interface and supplies the POINTBus power to the module. This allows the module to be part of a distributed I/O system connected to a programmable logic controller (PLC) over various networks. The module's local I/O register maps data to the host controller, making integration straightforward.

Selection Guide & Purchasing Advice

Before ordering, verify that your system uses a compatible POINT I/O communication adapter and that the voltage category (12/24VDC) matches your field devices. The 1734-IB4 is a sinking input module, so ensure your sensors or switches provide a sinking signal. Please verify current lifecycle status and availability with BluePLC Industrial before ordering. BluePLC Industrial offers genuine Allen-Bradley automation components with reliable service.