Product Overview
The Allen-Bradley 1794-OF4I is a Flex I/O isolated analog output module designed for precise control in demanding industrial environments. This module provides four isolated analog output channels, supporting both current and voltage signals, making it a versatile choice for a wide range of automation applications.
With a 15-bit plus sign resolution and a fast update rate, the 1794-OF4I ensures accurate and responsive output control. Its isolated channels help protect against ground loops and electrical noise, enhancing system reliability.
Technical Specifications
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Output Channels: 4 isolated
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Output Types: 4-20 mA, 0-20 mA, ±10 VDC, 0-10 VDC, ±5 VDC, 0-5 VDC
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Resolution: 15 bits plus sign (0.320 mV/cnt voltage, 0.656 mA/cnt current)
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Update Rate: 2.5/5.0 ms all channels
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Step Response: <25 µs to 63% of full scale
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External DC Supply: 24 V DC nominal, 19.2–31.2 V DC range (includes 5% AC ripple)
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Mounting: DIN Rail
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Operating Temperature: 0 to 55 °C (32 to 131 °F)
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Storage Temperature: –40 to 85 °C (–40 to 185 °F)
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Vibration: 5g @ 10 to 500 Hz
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Operating Shock: 30 g
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Isolation Voltage: 120V Continuous
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FlexBus Current: 50 mA
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Thermal Dissipation: 16 BTU/hr @ 31.2V DC max
Key Features & Benefits
The 1794-OF4I delivers high accuracy and flexibility. Its isolated channels prevent interference between outputs, which is critical in mixed-signal environments. The module supports user-configurable output ranges, allowing adaptation to various field devices without additional hardware.
With a resolution of 15 bits plus sign, the module provides fine granularity for precise control. The fast update rate of 2.5/5.0 ms ensures real-time responsiveness, while the <25 µs step response minimizes lag in dynamic processes.
Industry Applications
This module excels in applications requiring reliable analog output control, such as:
- Process control systems regulating valves, dampers, and actuators.
- Manufacturing lines where precise speed or position control is essential.
- Test and measurement setups needing accurate signal generation.
Installation & Setup
Mount the 1794-OF4I on a DIN rail. Connect the external 24V DC supply within the 19.2–31.2V DC range. Use compatible terminal bases (1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN) for wiring. Configure output ranges via the control system software.
Maintenance & Reliability
The module is factory-calibrated and designed for long-term reliability. Its robust construction withstands vibration up to 5g and shock up to 30g. Periodic inspection of connections and environmental conditions (temperature, humidity) ensures consistent performance.
Compatibility & Integration
The 1794-OF4I works with any Flex I/O communication adapter, integrating seamlessly into Rockwell Automation systems. It is compatible with 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN terminal bases.
Buying Guide
Before purchasing, verify your system's compatibility with Flex I/O and the required terminal base. Ensure the external supply matches the 24V DC nominal. PLC Source PRO offers this module with genuine Rockwell Automation quality and competitive pricing.