1734-IB4 | Allen-Bradley Digital DC Sinking Input Module Supplier

What Is the 1734-IB4?

When your control system requires dependable digital input sensing, the 1734-IB4 from Allen-Bradley provides a compact solution. This POINT I/O module features four sinking input channels operating at 24 Volts DC. As a Digital DC Sinking Input Module, it integrates seamlessly with any POINT I/O communication adapter and POINTBlock I/O modules to build distributed I/O architectures. With a power dissipation of 3.4 BTU/hour and a maximum input current of 5 milliamps, it is designed for efficiency in space-constrained panels.

Key Features & Technical Specs

• Inputs: 4 sinking input channels for 24V DC signals.
• Input Current Maximum: 5 milliamps per channel.
• POINTBus Current: 75 milliamps at 5V DC.
• Power Dissipation: 3.4 BTU/hour (1 Watt).
• Input Filter Time: 0.5 ms hardware plus 0 to 63 ms user-selectable.
• Dimensions: 56 x 12 x 75.5 mm (2.2 x 0.47 x 2.97 in.).
• Weight: Approximately 31.8 g (1.12 oz).
• Enclosure Type Rating: None (open-style).

One standout spec is the user-selectable input filter time up to 63 ms. This allows you to debounce noisy signals without external components, reducing false triggers in industrial environments.

Applications & Use Cases

In manufacturing lines, the 1734-IB4 reliably senses limit switches or proximity sensors. For packaging machinery, it monitors product presence with its four sinking inputs. Because it uses a standard POINT I/O form factor, it fits easily into existing control cabinets. Additionally, its low power dissipation makes it suitable for temperature-sensitive areas.

Installation Guide

Mount the 1734-IB4 on a DIN rail using zinc-plated yellow chromate steel rail for proper grounding. Avoid aluminum or plastic rails that may corrode or cause intermittent grounding. Secure the rail every 200 mm (7.8 inches) with appropriate anchors. Connect field wiring to the removable terminal block (RTB) at the bottom of the module. Set the keyswitch to position 1 before installation.

Maintenance & Reliability

Periodically inspect the module for dust or debris that could block airflow. Verify that the DIN rail remains securely fastened. Check the input status LEDs (yellow) to confirm signal activity. For long-term reliability, ensure the ambient temperature stays within the module's operating range. No special cleaning is required beyond routine visual checks.

Compatibility & Integration

The 1734-IB4 works with any POINT I/O communication adapter from the same 1734 series. These adapters host the network interface and supply the POINTBus power to the module. It supports both 2-wire and 3-wire input signals. The module's local I/O register maps data to the host controller over the selected communication network.

Troubleshooting & Common Issues

If an input channel does not respond, first verify the field power voltage is within 10-28.8V DC. Check that the on-state voltage is at least 10V DC and the on-state current is between 2 mA and 5 mA. For intermittent signals, adjust the input filter time via software. If the module status LED shows a recoverable fault, cycle power to the POINTBus.

FAQ about 1734-IB4

Q: What is the maximum input current for the 1734-IB4?

A: The maximum input current is 5 milliamps per channel.

Q: Can the 1734-IB4 be used with 12V DC sensors?

A: Yes, the field power voltage range is 10-28.8V DC, so 12V DC sensors are compatible as long as the on-state voltage exceeds 10V DC.

Q: What is the weight of the 1734-IB4?

A: The module weighs approximately 31.8 g (1.12 oz).

Q: How do I set the input filter time?

A: The filter time is user-selectable from 0 to 63 ms via software, in addition to a fixed 0.5 ms hardware filter.

Q: Does the 1734-IB4 require a separate power supply?

A: It draws POINTBus current of 75 milliamps at 5V DC from the communication adapter, so no separate supply is needed for the module logic.

Product Support & Availability

The 1734-IB4 is in stock and ready to ship from Petro Auto Tech. Please verify current lifecycle status and availability with Petro Auto Tech before ordering. Our team can assist with technical questions and cross-reference needs.