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Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1746-NO8V |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Analog Voltage Output Module |
| Series | SLC 500 |
| Output Channels | 8 single-ended |
| Output Voltage Ranges | ±10 VDC, ±10.25 VDC, 0–10 VDC, 0–5 VDC, 1–5 VDC (configurable per channel) |
| Resolution | 16-bit, 320 µV/count |
| Output Coding | -32,768 to +32,767 |
| D/A Conversion Method | R-2R Ladder Network |
| Backplane Current (5V DC) | 120 mA |
| Backplane Current (24V DC) | 160 mA (J4 jumper set to RACK); 0 mA (J4 jumper set to EXT) |
| Backplane Power Consumption | 5.6 W (typical) |
| External Power Requirement | +24V DC ±10% (N.E.C. Class 2 required for external mode) |
| Isolation | 500V DC (field wiring to backplane) |
| Operating Temperature | 0°C to +60°C |
| Load Range | 1K ohm and greater |
| Load Current (maximum) | 10 mA per channel |
| Step Response Time | 1 ms (0 to 95% of full scale) |
Main Features and Advantages
High-density channel architecture sets the 1746-NO8V apart from conventional analog output modules. By integrating eight independently configurable voltage channels into a single-width SLC 500 module, the 1746-NO8V delivers substantial space savings in control cabinets where panel real estate is at a premium. This density advantage is particularly valuable in large-scale process control applications involving multiple PID loops and coordinated modulation tasks that would otherwise require two separate 4-channel modules.
Precision signal generation is achieved through a 16-bit R-2R ladder digital-to-analog converter that produces fine-grained voltage outputs with resolution of 320 µV per count. The 1746-NO8V maintains overall accuracy of 0.1% of full scale at 25°C, with drift limited to ±33 ppm/°C, ensuring that analog control signals remain stable across the operating temperature range. Fast step response of 1 ms to 95% of full scale enables the 1746-NO8V to support dynamic control applications where rapid output changes are required, while channel update times of 5 ms (Class 1 mode) or 10 ms (Class 3 mode) ensure timely data refresh across all eight channels.
Flexible configuration options enhance the operational versatility of the 1746-NO8V. Each channel can be independently scaled using engineering units, PID format, proportional counts, or user-defined scaling to match the specific requirements of connected field devices. The module also provides advanced output data parameters including user-defined scale limits, output clamping, alarm limits, ramp rate control, and configurable fault behavior (reset, hold, or preset). Onboard diagnostics include per-channel and module status LED indicators, while Class 3 mode offers extended status feedback for over-range and under-range conditions.
