Product Overview
The Allen-Bradley 1746-NI16V is an Analog I/O Module from the SLC 500 series by Rockwell Automation. Designed for precise voltage measurement, it features sixteen (16) input channels compatible with ±10V dc, 1 to 5V dc, 0 to 5V dc, and 0 to 10V dc signals. This module communicates with an SLC 500 processor via a parallel backplane interface and draws a backplane current of 125 milliamps at 5 Volts and 75 milliamps at 24 Volts DC. Its 16-bit resolution and sigma-delta conversion ensure accurate data acquisition for industrial control systems.
Technical Specifications Breakdown
Key parameters for the 1746-NI16V are listed below for quick reference:
| Feature | Specification |
|---|---|
| Module Type | Analog I/O Module |
| Inputs | Sixteen (16) |
| Electrical Signal Type | ±10V dc, 1 to 5V dc, 0 to 5V dc, 0 to 10V dc |
| Resolution | 16 bits |
| Bandwidth | 6-250 Hertz |
| Backplane Current (5 Volts) | 125 milliamps |
| Backplane Current (24 Volts DC) | 75 milliamps |
| Conversion Type | Sigma - Delta |
| Input Filtering | Low-pass digital filter with programmable filter frequencies |
| 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 |
| Step Response | 9-630 milliseconds |
| Recommended Cable | Belden #8761 or equivalent |
Industry Applications
This analog module excels in applications requiring combination 120 Volts AC I/O, such as monitoring voltage levels in motor control centers or process lines. Its programmable filter frequencies (6 Hz to 250 Hz) allow engineers to tailor noise rejection for specific environments—critical in high-interference factory floors. The 1746-NI16V supports cost-effective system expansion by occupying any I/O slot except slot 0, reducing downtime during upgrades.
Installation & Setup Guidance
Install the module in any available slot of an SLC 500 chassis except slot 0, which is reserved for the controller. Use the replaceable terminal block (part number 1746-RT25G) or pre-wired cables with Allen-Bradley terminal blocks like 1492-AIFM8-3 for error-free wiring. Always disconnect power before inserting or removing the module to prevent electric arcs. The chassis location flexibility simplifies integration into both local and expansion racks.
Maintenance & Reliability
The module includes five green LED indicators—one for each group of four channels and one for module status—enabling quick visual diagnostics. Operate within standard industrial temperature ranges (refer to full datasheet). The 500V ac isolation for 1 second protects against transient surges. Inspect connections periodically to ensure reliable performance.
Compatibility & Integration
The 1746-NI16V integrates seamlessly with SLC 500 processors via the backplane. It supports standard cable lengths of 0.5, 1, 2.5, and 5.0 meters (Belden #8761 or equivalent). The module is UL listed, C-UL approved, and CE compliant, and approved for Class I Division 2 hazardous environments. Use pre-wired cables with 25-pin D-shell connectors for simplified installation.
Selection Guide & Purchasing Advice
When selecting the 1746-NI16V, verify your system's backplane current capacity (125 mA at 5V, 75 mA at 24V DC). This module is ideal for applications needing multiple voltage input ranges. SpareTechPLC stocks this module and can assist with availability and lifecycle status. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Troubleshooting & Common Issues
If the module does not communicate, check that it is inserted in a valid slot (not slot 0) and that backplane power is within limits. Verify input signal types match the configured range (±10V dc, 1 to 5V dc, etc.). If readings are noisy, adjust the programmable filter frequency (options: 6 Hz, 10 Hz, 20 Hz, 40 Hz, 60 Hz, 80 Hz, 100 Hz, 250 Hz) to reduce interference. The step response of 9-630 milliseconds indicates how quickly the module reacts to changes.
