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Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Allen-Bradley 1746-NO4I |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Analog Output Module |
| Number of Outputs | 4 (Current Output) |
| Output Current Range | 0 to +20 mA |
| Full Scale Output | 21 mA |
| Overrange Capability | 5% (0 to +21 mA – 1 LSB) |
| Resolution | 14 bits |
| Converter Method | R-2R Ladder |
| Step Response (5 to 95%) | 2.5 milliseconds |
| Update Time | 512 microseconds |
| Load Range | 0 to 500 Ohms |
| Backplane Current (5V DC) | 55 mA |
| Backplane Current (24V DC) | 195 mA |
| External Power Supply | 24V DC ±10% @ 195 mA max |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Backplane Isolation | 500 Volts DC |
| Terminal Style | Removable Screw Terminal Block |
Main Features and Advantages
Four Independent Current Output Channels: The Allen-Bradley 1746-NO4I provides four separate 0-20 mA output channels, each capable of independently driving a field device. This multi-channel capability reduces the number of modules required in a system, saving both chassis space and overall hardware cost. Each channel maintains its own isolated output path, ensuring that a fault on one channel does not propagate to the others.
High-Resolution Signal Generation: With 14-bit converter resolution and an R-2R ladder conversion architecture, the Allen-Bradley 1746-NO4I delivers fine-grained control over output current. The 2.56348 µA output resolution per LSB enables precise positioning of valves and accurate speed references for drives, contributing to improved process quality and reduced product variation.
Fast Update and Step Response: The Allen-Bradley 1746-NO4I features a parallel channel update time of 512 microseconds and a step response of 2.5 milliseconds, allowing it to respond quickly to changing control demands. This responsiveness is particularly valuable in PID control loops where timely output adjustments directly affect process stability and product consistency.
Flexible Power Configuration: An embedded selector switch on the Allen-Bradley 1746-NO4I permits selection between backplane-sourced 24V DC power and an external 24V DC supply. This design option enables engineers to optimize power supply loading across the SLC chassis, particularly in systems where the 24V backplane capacity is constrained .
