Product Overview
The Allen-Bradley 1734-IB8 is a digital DC sinking input module from the POINT I/O series by Rockwell Automation. Designed for distributed I/O architectures, this compact unit provides eight sinking input channels that accept a nominal signal voltage of 24VDC. It integrates seamlessly with any POINT I/O communication adapter, making it a versatile choice for industrial control systems that require reliable discrete input monitoring.
Technical Specifications Breakdown
Key parameters for the 1734-IB8 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number | 1734-IB8 |
| Module Type | Digital DC Sinking Input |
| Number of Inputs | 8; Sinking input |
| Input Voltage Range | 10-28.8VDC |
| Input Current Range | 2-5mA |
| Nominal Input Current | 4mA @24VDC |
| Input Filter Time | 0.5 ms hardware plus 0...63 ms (user-selectable) |
| Power Dissipation | 1.6 Watt/5.5 BTU/hour |
| POINTBus Current | 75 mA |
| Dimensions | 56 x 12 x 75.5 mm (2.2 x 0.47 x 2.97 in.) |
| Weight (approx.) | 31.8 g (1.12 oz) |
| Enclosure Type Rating | None (open-style) |
| Keyswitch Position | 1 |
| Module Location | 1734-TB or 1734-TBS wiring base assembly |
| Module Status Indicators | 1 green/red, logic side |
| Input Status Indicators | 8 yellow, logic side |
Industry Applications
This module is ideal for monitoring discrete sensors, push buttons, and limit switches in manufacturing lines, packaging machinery, and material handling systems. Its sinking input configuration and wide input voltage range (10-28.8VDC) allow direct connection to standard 24VDC sensors without external signal conditioning. In a typical automotive assembly line, the 1734-IB8 can reliably capture part-present signals from multiple stations, improving process visibility and reducing downtime.
Installation & Setup Guidance
Mount the 1734-IB8 on a 1734-TB or 1734-TBS wiring base assembly. Ensure the keyswitch is set to position 1 before insertion. Use the removable terminal blocks for wiring, and torque the base screws to 0.8 N-m (7 lb-in). The module is open-style, so install it in a clean, dry environment free from corrosive substances. It can be mounted horizontally or vertically. Connect the POINT I/O communication adapter to establish bus communication.
Maintenance & Reliability
Periodically inspect the module for dust accumulation and ensure the terminal connections remain tight. The LED indicators provide quick visual feedback: one green/red module status indicator and eight yellow input status indicators. Since the enclosure is open-style, avoid exposure to moisture or conductive debris. No special maintenance tools are required beyond standard industrial practices.
Compatibility & Integration
The 1734-IB8 works with any POINT I/O communication adapter, including those supporting DeviceNet and ProfiBus (Series C modules). It integrates into distributed I/O architectures, reducing wiring costs and simplifying system expansion. The module draws 75 mA from the POINTBus, ensuring low power consumption.
Selection Guide & Purchasing Advice
When selecting the 1734-IB8, confirm your system voltage matches the 24VDC nominal input and that your sensors are sinking type. SpareTechPLC stocks this module and can advise on lifecycle status. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Troubleshooting & Common Issues
If an input channel does not respond, check the wiring to the terminal base and verify the sensor output matches the sinking configuration. Use the yellow input status LEDs to confirm signal presence. If the module status LED is red, check the POINTBus connection and adapter compatibility. The user-selectable input filter (0-63 ms) can help debounce noisy signals.
