Product Introduction

The Allen-Bradley 1794-OF4I is a 4-channel isolated analog output module for the FLEX I/O platform. Featuring isolated inputs or outputs, protected outputs, electronic fusing, or diagnostics available on some modules, its Removal and Insertion Under Power (RIUP) lets you replace modules and make cable connections while the system is in operation. Each I/O module requires a terminal base for connection points for I/O wiring, allowing you to wire directly from sensor to terminal base of the Flex™ I/O module and eliminate the terminal strip.

ü Power Supply: 24V DC nominal

ü Number of Analogue Outputs: 4 qty (4 Point Isolated)

ü Analogue Resolution, Output: 16 bit (signed)

ü Operating Temperature: 0°C to 55°C

ü FlexBus Current (Extended): 80mA at 5V DC max

ü Power Dissipation (Extended): Maximum 4.7 Watts at 31.2V DC

ü Thermal Dissipation (Extended): Maximum 16.0 BTU/hr at 31.2V DC

Real-World Applications

l Oil and Gas Refining & Petrochemical Plants: Deployed to drive critical control valves and electronic actuators (using 4-20mA current loops) over long physical distances. The channel-to-channel isolation prevents ground loop currents from interfering with the precise modulation of explosive or flammable fluids.

l Water and Wastewater Treatment Facilities: Used to govern the variable speed drive (VFD) reference inputs (0-10V DC) for massive raw water pumps or chemical dosing mixers, ensuring precise chemical treatment adjustments based on localized flow variations.

l Metal, Steel, and Heavy Rolling Mills: Integrated into systems controlling continuous casting line drive speeds or hydraulic tension regulators. The 16-bit resolution delivers granular control over motor speeds, while the rugged isolation shields the PLC system from heavy electromagnetic interference (EMI) generated by arc furnaces.

Catalog

PLC: GE, FANUC, Schneider

DCS: ABB, Siemens, MOORE, Foxboro, Westinghouse, YOKOGAWA

ESD: Triconex, HIMA, Bently Nevada, ICS Triplex

Excitation cards: ABB, GE

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