Product Overview
The Allen-Bradley 1734-IA4 is a discrete input module from the POINT I/O series, engineered for distributed I/O applications in industrial automation. This compact module provides four (4) non-isolated, sinking input channels that accept 120 VAC signals, making it a reliable choice for monitoring AC-powered devices such as limit switches, push buttons, and proximity sensors.
Designed for flexibility, the 1734-IA4 mounts directly onto a terminal base (1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS), simplifying installation and reducing panel space. Its open-style enclosure and lightweight construction (30.9 g / 1.09 oz) allow for easy horizontal or vertical mounting in tight enclosures.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1734-IA4 |
| Module Type |
120 VAC Discrete Input Module |
| Series |
POINT I/O |
| No. of Channels |
4 (Sinking Input) |
| Input Voltage Range |
0-132 VAC |
| Nominal Input Voltage |
120 VAC |
| On-State Voltage (min/max) |
65 VAC / 132 VAC |
| Maximum Off-State Voltage |
43 VAC |
| Input Current Range |
4.0-8.5 mA |
| POINTBus Current |
75 mA @ 5 VDC |
| External Supply Voltage Range |
85-132 VAC, 47-63 Hz |
| Power Dissipation |
0.50 W @ 132 VAC |
| Thermal Dissipation |
3.4 BTU (max) |
| Dimensions (H x W x D) |
2.21 x 0.47 x 2.97 in |
| Weight |
30.9 g (1.09 oz) |
| Enclosure Rating |
None (open-style) |
Key Features & Benefits
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Four 120VAC Inputs: Monitor AC signals directly without external converters.
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Sinking Wiring: Compatible with standard sink-logic PLC systems.
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Compact POINT I/O Form Factor: Saves valuable panel space and simplifies system layout.
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Flexible Mounting: Can be installed horizontally or vertically, adapting to your enclosure design.
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LED Indicators: Module status, network status, and per-channel I/O status LEDs provide at-a-glance diagnostics.
Real-World Applications
The 1734-IA4 excels in applications requiring reliable AC input sensing. Typical use cases include:
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Machine Control: Detecting the position of limit switches or presence of parts in assembly lines.
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Process Monitoring: Monitoring valve position feedback or level switches in chemical and food processing.
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Packaging Systems: Tracking product flow and verifying actuator positions on high-speed packaging equipment.
Installation & Setup Guidance
Installing the 1734-IA4 is straightforward. Mount the module onto a compatible terminal base (1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS) until it clicks into place. Wire the AC field inputs to the terminal base per the wiring diagram, ensuring the external power supply is within the 85-132 VAC range (47-63 Hz). The module draws 75 mA from the POINTBus, so verify your power budget accordingly. No special tools are required, and the module's compact size allows for dense mounting.
Maintenance & Reliability
With no moving parts and an open-style enclosure, the 1734-IA4 requires minimal maintenance. Periodic inspection of wiring connections and terminal base integrity is recommended. Keep the module free from dust and moisture to ensure optimal performance. The module's low power dissipation (0.50 W max) reduces heat buildup, contributing to long-term reliability.
Compatibility & Integration
As part of the POINT I/O family, the 1734-IA4 integrates seamlessly with Rockwell Automation control platforms, including ControlLogix and CompactLogix systems. It communicates over the POINTBus backplane, allowing easy expansion of I/O capacity. The module supports up to four input channels and can be used in any slot of a POINT I/O chassis, subject to the host processor's I/O limitations.
Selection Guide & Purchasing Advice
Before ordering, confirm your system's voltage requirements and channel count. The 1734-IA4 is ideal for 120 VAC applications requiring four sinking inputs. Ensure you have the correct terminal base (sold separately) and that your power supply matches the module's input range. For detailed integration support, contact PLC Source PRO — your trusted source for genuine Allen-Bradley components.