The Allen Bradley 1794-IA8 is a FLEX I/O AC digital input module designed to interface 120V AC field signals with distributed automation systems. It provides 8 input channels in a compact form factor, making it ideal for small to medium-sized I/O nodes in industrial control applications.
This module is commonly used in legacy and mixed-generation PLC systems where reliable AC signal monitoring is required. It integrates with multiple FLEX I/O communication adapters, including EtherNet/IP, ControlNet, DeviceNet, and Remote I/O, allowing flexible deployment across different industrial architectures.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Model Number | 1794-IA8 |
| Product Family | FLEX I/O |
| Module Type | AC Digital Input Module |
| Input Channels | 8 points |
| Nominal Input Voltage | 120V AC |
| Input Voltage Range | 85–132V AC |
| ON Threshold | ~65V AC |
| OFF Threshold | ~43V AC |
| Input Frequency | 47–63 Hz |
| Input Type | Non-isolated AC inputs |
| Input Current | Approx. 12 mA per point @ 120V AC |
| FlexBus Current Draw | ~30 mA @ 5V DC |
| Power Dissipation | ~4.5 W (typical) |
| Isolation Voltage | Up to 2150 V DC (1 second) |
| Status Indicators | 8 channel LEDs + module status |
| Mounting Type | FLEX I/O terminal base (DIN rail system) |
| Compatible Bases | 1794-TB2 / TB3 / TBN series |
| Operating Temperature | -20°C to 55°C |
| Protection Class | IP20 |
Physical Dimensions & Weight (L × W × H Combined)
| Parameter | Specification |
|---|---|
| Dimensions (L × W × H) | Approx. 94 × 69 × 69 mm |
| Weight | Approx. 0.10–0.12 kg |
Recommended Related Models
The 1794-IA8 is often deployed in compact FLEX I/O stations alongside complementary modules.
| Related Model | Description |
|---|---|
| 1794-IA16 | 16-point AC input module |
| 1794-IB16 | 24V DC digital input module |
| 1794-OB16 | Digital output module |
| 1794-IE8 | Analog input module |
| 1794-OE4 | Analog output module |
| 1794-TB2 | Terminal base unit |
| 1794-TB3 | Terminal base unit |
| 1794-AENT | EtherNet/IP adapter |
| 1794-AENTR | Redundant EtherNet/IP adapter |
| 1794-ACN15 | ControlNet adapter module |
Popular Allen Bradley Automation Products
Allen Bradley FLEX I/O modules are widely used in distributed automation systems requiring modular expansion and reliable field signal acquisition.
| Popular Model | Product Category |
|---|---|
| 1756-L85E | ControlLogix Controller |
| 1769-L36ERM | CompactLogix Controller |
| 5069-IF8 | Analog I/O Module |
| 2711P-T12C4D8 | PanelView HMI |
| 20G11NC072AA0NNNNN | PowerFlex 755 Drive |
| 1734-AENTR | POINT I/O Adapter |
| 1606-XLS240E | Industrial Power Supply |
| 1756-EN2TR | Ethernet/IP Communication Module |
| 1794-IE8 | FLEX I/O Analog Module |
| 25B-D013N114 | PowerFlex 525 Drive |
