The Allen-Bradley 1794-IA8 is a compact and versatile AC digital input module from the renowned Flex I/O family. This module offers eight non-isolated input channels that accept AC signals within a voltage range of 85VAC to 132VAC, making it suitable for monitoring push buttons, selector switches, and proximity sensors. Its DIN-rail mountable design and yellow status indicators simplify both installation and diagnostics. For complete operation, you must mount this module on a compatible terminal base, such as the 1794-TB3 or 1794-TBN.
The 1794-IA8 operates with a nominal input voltage of 120VAC at 60Hz and features a well-defined on-state voltage starting from 65VAC minimum up to 132VAC maximum. The module's off-state voltage threshold is 43VAC maximum, which ensures clear signal distinction and minimizes false triggers. Its nominal input current is 12mA at 120VAC, while the minimum on-state current is 7.1mA, and the maximum off-state current is 2.9mA. Moreover, the input impedance is rated at 10.6KΩ nominal, providing consistent loading characteristics for field devices.
This module draws a Flexbus current of 30mA from the backplane, slightly higher than its 16-channel counterpart. Power dissipation reaches a maximum of 4.5W when operating at 132VAC, with a corresponding thermal dissipation of 15.3 BTU/hr. For isolation, the 1794-IA8 provides 2150VDC tested isolation between the user and the system, though the input channels are not isolated from each other.
One notable feature of the 1794-IA8 is its selectable input filter time, which you can adjust through the output image table. The OFF-to-ON filter time offers eight settings ranging from 8.4ms to 40ms, while the ON-to-OFF filter time ranges from 26.4ms to 58ms. By default, the module uses 8.4ms for OFF-to-ON and 26.4ms for ON-to-OFF transitions. This flexibility allows you to tailor the module's response to specific application needs, such as debouncing noisy switch contacts or filtering out transient signals.
Built for demanding industrial environments, the 1794-IA8 operates reliably across a temperature range of 0°C to 55°C (32°F to 131°F). Storage temperatures can span from -40°C to 85°C (-40°F to 185°F). The module withstands operating shocks of 30g and non-operating shocks of 50g, with vibration tested at 5g from 10 to 500Hz per IEC 68-2-6 standards. Its open-style enclosure carries an IP20 protection rating, requiring installation inside a suitable cabinet. The compact dimensions are 46mm x 94mm x 53mm (1.8in x 3.7in x 2.1in), making it a space-efficient choice for control panels.
Proper installation of the 1794-IA8 requires a compatible Flex I/O terminal base. Supported bases include the 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TB2, 1794-TB3K, 1794-TB3SK, 1794-TBNK, and 1794-TBKD models. These terminal bases facilitate straightforward wiring and allow for daisy-chaining power connections between adjacent modules, which significantly reduces wiring complexity and material costs. Furthermore, the 1794-IA8 integrates seamlessly with various Flex I/O communication adapters, including EtherNet/IP, ControlNet, DeviceNet, and Profibus DP options. The module's keyswitch must be set to position 8 for correct mounting and electrical alignment. Wiring should use 22 to 12 AWG stranded copper wire as recommended.
1 x Allen-Bradley 1794-IA8 AC Input Module
1 x Installation Instructions Manual
Note: Terminal bases, communication adapters, and wiring accessories are sold separately.
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1. What terminal bases are compatible with the 1794-IA8?
The 1794-IA8 works with the 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TB2, 1794-TB3K, 1794-TB3SK, 1794-TBNK, and 1794-TBKD terminal bases.
2. Can I adjust the input filter time on the 1794-IA8?
Yes, the 1794-IA8 offers selectable filter times through the output image table, with eight settings for both OFF-to-ON and ON-to-OFF transitions.
3. Is the 1794-IA8 isolated from other channels?
No, the eight input channels on the 1794-IA8 are non-isolated from each other. Isolation is provided only between the user and the system.
4. What communication adapters work with this module?
The 1794-IA8 supports EtherNet/IP, ControlNet, DeviceNet, and Profibus DP communication adapters within the Flex I/O system.
5. What is the default filter time setting for this module?
The default filter time is 8.4ms for OFF-to-ON transitions and 26.4ms for ON-to-OFF transitions on the 1794-IA8.
| Brand Name | |
| Model No. | 1794-IA8 |
| Product Type | Digital Input Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
