Allen-Bradley 1746-NIO4I SLC 500 Analog Combo Module

Allen‑Bradley 1746‑NIO4I SLC 500 Analog Combination Module

Product Introduction

The Allen‑Bradley 1746‑NIO4I is a versatile analog combination module for the SLC 500 platform. It integrates two input channels and two output channels into a single-slot solution. This module supports both voltage and current signals on the input side. Meanwhile, it provides two current outputs for control applications. The 1746‑NIO4I is an excellent choice for systems where panel space is limited. It is compatible with both fixed and modular SLC 500 hardware styles.

Technical Specifications

The Allen‑Bradley 1746‑NIO4I offers flexible input and output capabilities. The two input channels are differential and non-isolated. They accept either voltage or current signals. For voltage, the range is -10 to +10V dc. For current, the range is -20 to +20 mA. The maximum allowable input is -30 to +30 mA. The input resolution is 16 bits, ensuring precise data conversion. Additionally, the repeatability is within ±1 LSB.

On the output side, this module provides two current output channels. The normal output range is 0 to 20 mA. It features a 5% over-range capability. The output resolution is 14 bits. The non-linearity is rated at 0.05%. This ensures accurate and stable control signals. The 1746‑NIO4I uses a Sigma-Delta ADC converter for reliable performance.

Input impedance is 250 Ohms for current and 760 KOhms for voltage. The module offers an overall accuracy of ±0.642% for inputs and ±0.541% for outputs. Furthermore, it provides tested voltage isolation of 500 Volts between field wiring and the backplane.

Mechanical and Environmental Parameters

The Allen‑Bradley 1746‑NIO4I is designed for demanding industrial conditions. It operates within a temperature range of 0 to 60 degrees Celsius. The module also supports 5 to 95% non-condensing relative humidity. It features a common-mode voltage range of -20 to 20 Volts. Additionally, the common-mode rejection is 105 dB at 60 Hertz. The normal mode rejection is 55 dB at 60 Hertz. These specifications ensure stable operation in noisy environments.

Installation and Configuration Guide

Installing the 1746‑NIO4I is simple and efficient. You can place it in any slot of the main chassis except Slot 0. Slot 0 is reserved for the processor or communication adapters. Specifically, in remote I/O stations, Slot 0 must hold adapters like RIO, DH+, or Ethernet. The module is also suitable for expansion chassis. This flexibility allows for strategic placement and effective I/O segmentation.

The 1746‑NIO4I contributes to saving panel space. By combining input and output functions in one slot, it maximizes the available slots in your SLC 500 rack. This is especially beneficial for modular hardware configurations. The module connects via a removable terminal block. This design simplifies wiring and replacement. For input signals, the current range translates to raw data of -16,384 to +16,384. The voltage input translates to -32,768 to +32,767 raw data. This data mapping integrates seamlessly with your control program.

Data Formats and Performance

The Allen‑Bradley 1746‑NIO4I delivers fast and accurate signal processing. The aggregate update time for all channels is 512 microseconds. This ensures timely data acquisition and control. The input step response is 60 milliseconds. The output step response is a rapid 2.5 milliseconds. This module supports various data formats for flexible integration.

Accuracy is a key strength of the 1746‑NIO4I. For inputs, the drift accuracy is ±79 ppm per 5°C. The maximum gain error is ±0.556%. For outputs, the drift accuracy is ±70 ppm per °C. The offset error is within ±12 LSB. These specifications guarantee reliable performance across the temperature range. Additionally, the module offers overvoltage protection up to 220V AC (RMS) or 220V DC continuous.

Packaging List

Your shipment for the Allen‑Bradley 1746‑NIO4I includes the following items:

• Allen‑Bradley 1746‑NIO4I Analog Combination Module (1 unit)

• Removable Terminal Block

• Installation Instructions

Note: Configuration software and cables are sold separately.

Shipping Method: FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

1. What is the main advantage of using the 1746‑NIO4I?
The main advantage is its combination of 2 inputs and 2 outputs in a single slot. This saves space and reduces the number of modules needed for your system.

2. Can I use both voltage and current inputs simultaneously?
Yes, you can configure the two input channels independently. Each channel can be set for either voltage or current as per your application needs.

3. What is the resolution of the 1746‑NIO4I?
The input resolution is 16 bits with a repeatability of ±1 LSB. The output resolution is 14 bits with a non-linearity of 0.05%.

4. Where can I install the Allen‑Bradley 1746‑NIO4I in the chassis?
You can install it in any slot except Slot 0. Slot 0 is reserved for the processor or communication adapters like RIO or DH+.

5. What is the update time for all channels on this module?
The aggregate update time for all input and output channels is 512 microseconds. This ensures fast response for time-critical applications.