Product Overview
The Allen-Bradley 1794-IA8 is a discrete input module featuring 8 non-isolated inputs. It is designed for AC-powered applications with a nominal voltage rating of 120 Volts AC. This module mounts on a DIN rail and carries an IP 20 environmental protection rating, making it suitable for control cabinet use. Eight yellow status indicators provide clear visual feedback for each input channel.
Technical Specifications Breakdown
Key parameters for the 1794-IA8 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Product Type | Flex I/O AC Digital Input Module |
| Inputs | 8 Non-Isolated |
| On-state Voltage (min.) | 65V AC |
| On-state Voltage (max.) | 132V AC |
| On-state Current (min.) | 7.1mA |
| On-state Current (max.) | 14.32mA |
| Off-state Voltage (max.) | 43V AC |
| Off-state Current (min.) | 2.9mA |
| Nominal Input Current | 12 mA @ 120V AC |
| Flexbus Current | 30mA @ 5V DC |
| Power Dissipation | 4.5W @ 132V AC max. |
| Operating Temperature | -20 to 55 °C |
| Relative Humidity | 5 to 95% (non-condensing) |
Industry Applications
Common uses include monitoring motor starter status, detecting limit switch positions, and reading pushbutton inputs in manufacturing lines. The 8 non-isolated inputs are well-suited for grouped AC signals within the same potential. The wide operating temperature range of -20 to 55 °C ensures dependable operation in unconditioned plant floors.
Installation & Setup Guidance
Mount the 1794-IA8 on a DIN rail using the integrated mounting foot. Ensure the IP 20 rated enclosure is installed within a suitable cabinet to protect against dust and moisture. Use 22 to 12 AWG stranded copper wire for field connections. The module attaches to compatible terminal base units such as the 1794-TB3K, 1794-TBN, and 1794-TB3S. Verify the 8 key switch positions match your application requirements before powering up.
Maintenance & Reliability
Periodically inspect the module for signs of dust accumulation or loose connections. The module's operating temperature range of -20 to 55 °C and relative humidity of 5 to 95% (non-condensing) provide flexibility in various environments. The default filter time from OFF to ON is 8.4 milliseconds and from ON to OFF is 26.4 milliseconds, ensuring stable signal debouncing. No special maintenance is required beyond routine visual checks.
Compatibility & Integration
It is compatible with a wide range of Allen-Bradley controllers. The module's isolation voltage of 2150 Volts DC (for 1 second) between system and user provides robust electrical isolation.
Selection Guide & Purchasing Advice
When selecting the 1794-IA8, confirm your system voltage matches the 120V AC nominal input. For applications requiring isolated inputs, consider alternative modules. AutoDCSTech offers this module with verified authenticity and fast shipping. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Troubleshooting & Common Issues
If inputs fail to register, check the AC supply voltage is within the on-state range (65 to 132V AC). Verify wiring to the terminal base unit is secure and matches the correct pinout. The off-state voltage must remain below 43V AC to ensure reliable OFF detection. If status indicators do not illuminate, inspect the FlexBus connection and backplane power.
Availability & Condition at AutoDCSTech
| Part Number | 1794-IA8 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
