Product Overview
The Allen-Bradley 1746-NI16I is a SLC 500 Analog I/O Module designed for precise monitoring of analog process variables. This module provides sixteen (16) inputs configurable for 0 to 20 mA, 4 to 20 mA, ±20 mA, and 0 to 1 mA. Without such feedback, automatic control cannot be fully implemented.
Technical Specifications Breakdown
Key parameters for the 1746-NI16I are listed below for quick reference:
| Feature | Specification |
|---|---|
| Module Type | Analog I/O Module |
| Number of Inputs | Sixteen (16) |
| Electrical Signal Types | 0 to 20 mA, 4 to 20 mA, ±20 mA, 0 to 1 mA |
| Backplane Current (5 Volts) | 125 mA |
| Backplane Current (24 Volts DC) | 75 mA |
| Thermal Dissipation | 2.43 Watts |
| Bandwidth | 6-250 Hertz |
| Step Response | 9-630 milliseconds |
| Conversion Type | Sigma - Delta |
| Input Filter Frequencies | 6 Hz, 10 Hz, 20 Hz, 40 Hz, 60 Hz, 80 Hz, 100 Hz, 250 Hz |
| Isolation | 500V ac isolation for 1 second |
| LED Indicators | 5 green status indicators (one for each group of 4 channels, one for module status) |
| Chassis Location | Any I/O module slot except slot 0 |
Industry Applications
Typical applications include monitoring flow, pressure, and level transmitters using 4-20 mA loops. The programmable low-pass digital filter (6 Hz to 250 Hz) helps reduce noise in electrically noisy industrial settings, ensuring clean feedback for PID-based control loops.
Installation & Setup Guidance
Install the 1746-NI16I in any I/O module slot except slot 0 of a SLC 500 chassis. It occupies a single slot. When wiring, use Belden #8761 or equivalent cable with a maximum wire size of 14 AWG. Up to two wires may be terminated per terminal. The module supports open-circuit detection per input channel. It is not necessary to remove terminal blocks during installation, but if removed, use the label near the terminal block to identify the module location and type.
Maintenance & Reliability
Operate the module within its rated temperature range of -25 to 60 degrees Celsius and relative humidity of 5% to 95% (non-condensing). Periodically inspect the 25-pin D-shell connector for corrosion or damage. Ensure the chassis slot provides adequate ventilation to maintain thermal dissipation of 2.43 Watts.
Compatibility & Integration
The module is part of the Allen-Bradley SLC 500 series and integrates with any SLC 500 processor. It supports user-selectable data formats including Engineering Units, Scaled for PID, Proportional Counts (-32,768 to +32,767 range), and Proportional Counts with User-Defined Range (Class 3 only). The module also features open-circuit detection per channel.
Selection Guide & Purchasing Advice
When selecting the 1746-NI16I, confirm your application requires 16 analog current inputs with 16-bit resolution. For availability and lifecycle status, contact AutoDCSTech. We stock genuine Allen-Bradley modules ready for shipment.
Troubleshooting & Common Issues
If the module does not communicate, verify backplane power: 5V at 125 mA and 24V DC at 75 mA. Check the green status LEDs — one per group of four channels and one for module status. An open circuit can be detected per channel using the module's built-in diagnostics. Ensure input signals remain within ±30 mA maximum current input to avoid damage.
Availability & Condition at AutoDCSTech
| Part Number | 1746-NI16I |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
