1734-IB8 | Allen-Bradley Digital DC Sinking Input Module Supplier

What Is the 1734-IB8?

When your control system requires dependable discrete input sensing, the 1734-IB8 from Allen-Bradley provides a compact solution. This POINT I/O module features eight sinking input channels that accept nominal 24VDC signals. It is designed to work with any POINT I/O communication adapter, enabling efficient distributed I/O architectures. The module requires a 1734-TB or 1734-TBS wiring base assembly for installation.

Key Features & Technical Specs

• Inputs: 8 sinking input channels with one group of eight inputs per common.
• Input Voltage Range: 10–28.8VDC, with a nominal voltage of 24VDC.
• Input Current Range: 2–5mA; nominal 4mA at 24VDC.
• Input Filter Time: 0.5 ms hardware plus user-selectable 0–63 ms.
• Power Dissipation: 1.6 Watt / 5.5 BTU per hour.
• POINTBus Current: 75 mA at 5VDC.
• 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).
• Keyswitch Position: 1.
• Status Indicators: One green/red module status LED and eight yellow input status LEDs.

A distinctive feature of the 1734-IB8 is its user-selectable input filter time. This allows you to adjust the filter from 0 to 63 ms (in addition to the fixed 0.5 ms hardware filter), providing flexibility to debounce noisy signals or optimize response speed for your application.

Applications & Use Cases

In manufacturing environments, the 1734-IB8 excels at monitoring limit switches, push buttons, and proximity sensors. For example, in a packaging line, this module can reliably detect product presence and trigger downstream actions. Its sinking input configuration is ideal for systems using a common positive supply, simplifying wiring in many industrial setups. Additionally, the compact form factor (12 mm wide) saves valuable panel space when multiple I/O points are needed.

Installation & Setup

Mount the 1734-IB8 onto a 1734-TB or 1734-TBS wiring base assembly that is already installed on a DIN rail. Ensure the keyswitch is set to position 1 to prevent mismating with other modules. Connect field wiring to the removable terminal blocks, applying a torque of 0.8 N·m (7 lb·in). The module automatically draws power from the POINTBus, so no separate power supply connection is required. Always power down the system before inserting or removing the module.

Maintenance & Reliability

Because the 1734-IB8 has an open-style enclosure, it should be installed in a clean, dry location free from corrosive substances. Periodically inspect the module for dust accumulation and verify that all input status LEDs illuminate correctly. The module operates reliably within an ambient temperature range of –21 to 55 °C. Following these simple practices helps extend service life and minimize unexpected downtime.

Compatibility & Integration

The 1734-IB8 is part of the POINT I/O family and works with any compatible POINT I/O communication adapter. This includes adapters supporting EtherNet/IP, ControlNet, DeviceNet, and PROFIBUS (as noted in the description for Series C modules). Integration with Rockwell Automation controllers such as CompactLogix or ControlLogix is straightforward via the adapter. The module also supports distributed I/O architectures, reducing wiring costs and simplifying system expansion.

Frequently Asked Questions about 1734-IB8

Q: What is the input voltage range of the 1734-IB8?

A: The input voltage range is 10–28.8VDC, with a nominal voltage of 24VDC.

Q: How many input channels does the 1734-IB8 have?

A: It has eight sinking input channels arranged in one group.

Q: What is the power dissipation of the 1734-IB8?

A: The module dissipates 1.6 Watt (5.5 BTU per hour).

Q: Does the 1734-IB8 require a separate terminal base?

A: Yes, it requires a 1734-TB or 1734-TBS wiring base assembly.

Q: Can the input filter time be adjusted?

A: Yes, the filter time consists of a fixed 0.5 ms hardware filter plus a user-selectable 0–63 ms software filter.

Product Support & Availability

The 1734-IB8 is in stock and ready to ship from Petro Auto Tech. As a trusted supplier of industrial automation parts, Petro Auto Tech offers competitive pricing and fast delivery. Contact our team for current availability and lifecycle status before ordering.