FLEX I/O (1794 Series) | Allen-Bradley | 1794-OA8I FLEX 8-POINT DIGITAL OUTPUT MODULE

Product Description: Allen-Bradley 1794-OA8I

The Allen-Bradley 1794-OA8I is an 8-channel digital output module designed for the FLEX I/O platform. It features isolated triac outputs capable of switching AC loads up to 264V, making it suitable for controlling relays, contactors, indicators, and other AC-powered devices. Each output is individually isolated, providing high reliability and protection for systems where independent AC signal control is required.

Key Features

• 8 individually isolated AC output channels
• Triac-based switching for 120/240V AC loads
• Supports 47–63 Hz frequency range
• Output status indication via onboard LEDs
• Compatible with FLEX I/O terminal bases (e.g., 1794-TB3S)
• Each channel can operate independently, ideal for diverse AC applications

Technical Specifications

• Output Type: Triac (AC switching)
• Voltage Range: 85–264V AC
• Frequency: 47–63 Hz
• Max Output Current: 1.0 A per channel (resistive load), 8.0 A total per module
• Minimum Load: 10 mA at 85V AC
• Surge Current: 20 A for 0.5 cycles, 1.0 A continuous
• Output Delay: On: ≤1 ms, Off: ≤11 ms
• Isolation Voltage: 250V AC (channel-to-channel and channel-to-backplane)
• Power Dissipation: Approx. 6.4 W
• Operating Temperature: 0°C to 55°C
• Mounting: DIN rail via appropriate terminal base
• Certifications: UL Listed, CE, CSA, RoHS, Class I Div 2

Application Areas

• Factory automation using 120/240V AC output devices
• Control of relays, alarms, and pilot lights
• Industrial processes with isolated output requirements
• OEM panels with multi-voltage AC control systems
• Distributed I/O applications requiring per-channel isolation

Advantages

• Individually isolated outputs improve noise immunity and system safety
• Handles both low and high-voltage AC loads reliably
• Triac outputs ensure long service life with no mechanical wear
• High versatility in switching different types of AC devices
• Seamless integration with the FLEX I/O architecture