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Allen-Bradley 1746-NIO4V SLC 500 Analog Combination I/O Module
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- Part Number: 1746-NIO4V
- Brand: Allen-Bradley
- Type: Analog I/O Modules
- Barcode: USA
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Product Description
The Allen-Bradley 1746-NIO4V, also cataloged as the 1746-NIO4V Analog Combination I/O Module, operates as a dedicated hardware component for simultaneous analog signal input measurement and voltage output generation within SLC 500 chassis assemblies.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Model | 1746-NIO4V |
| Origin | USA |
| Weight | 0.34 kg (0.75 lbs) |
| Dimensions | Single-slot SLC 500 chassis footprint |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | Standard backplane power draw |
| Number of Inputs | 2 differential voltage/current inputs |
| Input Ranges | -20 to +20 mA (current), -10 to +10 VDC (voltage) |
| Input Resolution | 16-bit (1.22070 uA/LSB current, 305.176 uV/LSB voltage) |
| Number of Outputs | 2 non-isolated voltage outputs |
| Output Range | -10 to +10 VDC |
| Output Resolution | 14-bit (1.22070 mV per LSB) |
| Conversion Method | Sigma-delta modulation (inputs), R-2R ladder (outputs) |
| Step Response | 60 ms (inputs), 2.5 ms (outputs at 95%) |
| Field-to-Backplane Isolation | 500 VDC |
| Backplane Current | 55 mA at 5.1 VDC, 115 mA at 24 VDC |
| Module Location | Any chassis slot except Slot 0 |
Deterministic Backplane & I/O Density Scaling
The 1746-NIO4V executes high-speed signal conversion using 16-bit input sigma-delta modulation and 14-bit output R-2R ladder D/A conversion, continuously updating data tables over the SLC backplane bus. The module leverages internal firmware flash compatibility to process differential input channels and output loops simultaneously with a 512-microsecond update time and 10 Hz bandwidth. Backplane bus communication velocity guarantees low-latency signal throughput, enabling compact, high-density analog control loops without degrading cyclic CPU execution speed.
Frequently Asked Questions
Q: What input impedance and overvoltage limits apply to the 1746-NIO4V input channels?
A: Current input channels present a nominal impedance of 250 Ohms, while voltage input channels feature a high 1 Mohm input impedance. Input terminals incorporate overvoltage protection up to 220 VAC or 220 VDC.
Q: Are the output channels on the 1746-NIO4V individually isolated from each other?
A: No, the 2 analog voltage output channels are non-isolated from one another. However, the module provides 500 VDC isolation between field wiring and the SLC backplane bus.
Q: Can the 1746-NIO4V module be located in Slot 0 of an SLC 500 chassis?
A: No, Slot 0 is strictly designated for the primary CPU processor module. The 1746-NIO4V can be installed in any available I/O expansion slot within the local chassis.
Field Installation Guidelines
Turn off all main electrical power to the SLC 500 chassis before inserting or removing the 1746-NIO4V module. Check the backplane card edge connectors and slot guide rails to ensure smooth alignment without bending backplane pins.
Connect field instrumentation signals using recommended Belden 8761 shielded 2-conductor cable (14 AWG max wire size). Route low-level analog signal cables away from AC power lines, high-current switching devices, and motor drive conduits. Terminate cable shielding drain wires strictly at a single enclosure earth ground connection to prevent electrical noise coupling and ground loops across the analog loops.
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