Overview
The Allen-Bradley 1794-IA8 is an 8-point AC digital input module from the FLEX I/O 1794 series designed for 120VAC signal monitoring in distributed I/O applications. It features 8 non-isolated inputs and converts AC signals to the appropriate logic level for use within the processor. The module has an open-style design with an IP 20 environmental protection rating and mounts on a DIN Rail. This compact module is ideal for industrial automation, process control, and motion control systems requiring flexible modular expansion.
Key Features
- 8 non-isolated inputs converting AC signals to appropriate logic levels
- 8 yellow status indicators for channel monitoring
- 2150V DC isolation (field to system) for high signal integrity
- Built-in filtering with 8.4 ms ON delay and 26.4 ms OFF delay for reliable operation
- Compatible with 22 to 12 AWG stranded copper wire
- DIN rail and panel mount options
Technical Specifications
Electrical Performance:
Operating voltage range 85 to 132 Volts AC at 47 to 63 Hertz, with minimum on-state voltage of 65 Volts AC, nominal voltage of 120 Volts AC, and off-state voltage of 43 Volts AC. Nominal current is 12 mA at 120 Volts AC, 60 Hertz. Isolation voltage of 2150 Volts DC (1 second between system and user), FlexBus current of 30 mA at 5 Volts DC, and maximum power dissipation of 4.5 W at 132 Volts AC.
Environmental & Physical:
Operating temperature of -20 to 55 degrees Celsius with relative humidity of 5 to 95% (non-condensing). Dimensions are 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 inches). Complies with global standards for industrial environments (UL, CE, ATEX).
Typical Applications
The 1794-IA8 is widely used in:
- Distributed I/O systems monitoring discrete AC signals
- Industrial automation and motion control environments
- Field device signal detection from switches and sensors
- Motor control centers and process control systems
- Safety function applications in manufacturing and production lines
Compatibility & Replacements
Compatible With
- FLEX I/O 1794 distributed I/O systems
- Allen-Bradley ControlLogix, CompactLogix, and MicroLogix controllers (via adapter)
- EtherNet/IP networks
- DeviceNet communication
- Remote I/O systems
- Profibus DP networks
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1794-IA8 is a standard FLEX I/O non-isolated input module. The isolated variant is the 1794-IA8I, which differs in isolation characteristics and should be verified before substitution.
Works With
- Terminal Base Units: 1794-TB3K, 1794-TBN, 1794-TB3SK, 1794-TB2, 1794-TBNK, 1794-TB3, 1794-TBKD, and 1794-TB3S
- Communication Adapters: 1794-AENT (EtherNet/IP), DeviceNet adapters, ControlNet adapters
- Rockwell Studio 5000 engineering environment
- RSLinx industrial communications software
