Product Overview
The Allen-Bradley 1794-IM16 is a digital input module from the Flex I/O 1794 series, engineered for reliable control and monitoring in industrial environments. This module supports up to 16 digital inputs, making it a versatile choice for a wide range of automation applications.
With a nominal on-state voltage of 240 VAC and an input voltage range of 159 to 264 VAC, the 1794-IM16 handles demanding line voltages with ease. Its non-isolated input design simplifies integration into existing control panels, while the operating temperature range of 0 to 55°C ensures dependable performance in typical plant conditions.
Technical Specifications
The following table outlines the key electrical and physical characteristics of the Allen-Bradley 1794-IM16, based on manufacturer data:
| Parameter |
Value |
| Number of Inputs |
16 |
| Nominal On-State Voltage |
240 VAC |
| Input Voltage Range |
159–264 VAC |
| Input Type |
Non-isolated |
| Operating Temperature |
0–55 °C |
| Nominal Input Impedance |
22.2 kΩ |
| Input Current at 240 VAC |
11 mA |
| FlexBus Current |
32 mA at 5 VDC |
| Maximum Power Dissipation |
6 W at 264 VAC |
| Thermal Dissipation |
20.47 BTU/hr at 264 VAC |
| Dimensions (H × W × D) |
94 × 94 × 91 mm (3.7 × 3.7 × 3.6 in) |
| Weight |
141 g (4.97 oz) |
These specifications confirm that the 1794-IM16 is a compact yet capable module, delivering efficient performance without occupying excessive panel space.
Industry Applications
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Discrete Manufacturing: Monitor limit switches and proximity sensors on assembly lines to track part presence and machine status.
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Process Control: Integrate the 1794-IM16 into a Flex I/O system to read valve position feedback or level switch signals in chemical or food processing plants.
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Material Handling: Use the module to detect conveyor jam conditions or pallet positions, enabling rapid response to operational issues.
In each scenario, the module's 240 VAC input rating and wide voltage tolerance make it suitable for direct connection to many industrial sensors and devices, reducing the need for additional signal conditioning.
Installation & Setup Guidance
Mount the 1794-IM16 onto a standard Flex I/O rail and connect it to the FlexBus backplane. Ensure the backplane provides 5 VDC power and adequate current for the module's FlexBus requirement of 32 mA.
Wire the field inputs to the terminal block, observing polarity and voltage ratings. Because the inputs are non-isolated, verify that the common potential is consistent across all connected devices to avoid ground loops. After wiring, apply power and verify that each input channel responds correctly using the module's status indicators.
Maintenance & Reliability
Regularly inspect the terminal connections for tightness and signs of corrosion, especially in humid or corrosive atmospheres. Keep the module's surface clean and ensure airflow around the enclosure to maintain the 0–55 °C operating range.
Periodically test the input channels by simulating signals to confirm proper operation. Early detection of a faulty input can prevent unexpected downtime and reduce maintenance costs over the module's service life.
Compatibility & Integration
The 1794-IM16 is part of the Allen-Bradley Flex I/O family, designed to integrate with various Allen-Bradley controllers (e.g., ControlLogix, CompactLogix) through an appropriate Flex I/O adapter. It communicates over the FlexBus backplane, allowing seamless data exchange with the PLC.
When selecting a communication adapter, confirm it supports the required network protocol (e.g., EtherNet/IP, ControlNet) for your plant architecture. The module's digital inputs connect directly to standard field devices, simplifying system design.
Buying Guide
Before purchasing the 1794-IM16, verify that your system's backplane and power supply can accommodate the module's current draw and physical dimensions. Also, confirm the input voltage range matches your field devices.
For genuine, tested modules with reliable warranty support, consider PLC Source PRO as your supplier. They offer the Allen-Bradley 1794-IM16 with a 2-year DO Supply warranty, ensuring peace of mind for your investment.