Product Overview

The Allen-Bradley 1746-NIO4V is an SLC 500 analog combination module. This module features two differential inputs that are voltage or current selectable per channel. Input signal ranges include -20 to +20 mA or -10 to +10V DC. The Allen-Bradley 1746-NIO4V also provides two current outputs with a signal range of 0 to +20 mA. Users trust this module for compact analog I/O in SLC 500 systems.

Technical Specifications

The 1746-NIO4V delivers flexible analog input and output capabilities. Below are the complete technical details.

General Specifications

• Manufacturer: Rockwell Automation.

• Brand: Allen-Bradley for industrial control reliability.

• Part Number: 1746-NIO4V for precise identification.

• Series: SLC 500 programmable logic controller platform.

• Module Type: Analog combination module.

• Mounting: Rack mount in 1746 chassis.

• UPC: 10662073735899 for universal product identification.

• Slot Occupancy: Single slot of the chassis.

• Terminal Block: Removable terminal block for signal wiring.

Input Specifications

• Number of Inputs: Two (2) Differential Voltage / Current inputs.

• Input Type: User-selectable per channel.

• Current Input Range: -20 to 20 mA.

• Current Input Impedance: 250 Ohm.

• Current Input Resolution: 1.22070 µA per LSB (16-bit).

• Voltage Input Range: -10 to +10V dc - 1 LSB.

• Voltage Input Impedance: 1M Ohm.

• Voltage Input Resolution: 305.176 µV per LSB (16-bit).

• Conversion Method: Delta-Sigma modulation.

• Repeatability: ±1 LSB.

• Non-Linearity: 0.01%.

• Bandwidth: 10 Hertz.

• Update Time: 512 microseconds.

• Step Response: 60 milliseconds input.

Input Accuracy Specifications

• Current Input Accuracy: ±0.642%.

• Current Input Drift: 79 ppm per 5°C.

• Voltage Input Accuracy: ±0.504%.

• Voltage Overall Drift: ±63 ppm per degree Celsius.

• Voltage Maximum Gain Error: ±0.461%.

• Offset Error: ±14 LSB at 0 to 60°C.

• Maximum Overvoltage Protection: 220 Volts AC or 220 Volts DC across input terminals.

Output Specifications

• Number of Outputs: Two (2) non-isolated voltage outputs.

• Output Signal Range: 0 to +20 mA current.

• Output Voltage Range: -10 to +10 volts.

• Output Voltage Resolution: 1.22070 mV per LSB (14-bit).

• Conversion Method: R-2R Ladder Digital-to-Analog Converter (DAC).

• Converter Resolution: 14 bits at voltage output.

• Response Time: 2 milliseconds.

• Step Response: 2.5 milliseconds output (at 95%).

• Load Range: Greater than 1 kOhms.

• Load Reactance: 1 µF maximum.

Output Accuracy Specifications

• Overall Output Accuracy: ±0.384% of 10V DC full-scale.

• Maximum Drift Accuracy: ±54 ppm per degree Celsius.

• Maximum Gain Error: ±0.374%.

• Gain Drift Error: ±47 ppm per degree Celsius.

• Output Offset Error: ±11 LSB.

Power and Backplane Specifications

• Backplane Current at 5.1 Volts: 0.55 mA (55 mA typical).

• Backplane Current at 24 Volts: 115 mA (145 mA typical).

• Field Wiring-to-Backplane Isolation: 500 Volts DC.

Wiring Specifications

• Recommended Cable: Shielded Belden #8761.

• Recommended Wire Gauge: 14 AWG size.

• Cable Type: Shielded for noise immunity.

System Compatibility

• CompactLogix PAC: Compatible as distributed I/O module.

• ControlLogix PAC: Compatible as distributed I/O module.

• SLC 500 Chassis: 1746 chassis required.

Installation Guide

Follow these steps to install the Allen-Bradley 1746-NIO4V correctly.

1. Power Down the Chassis: Remove all power from the SLC 500 chassis.

2. Select an Available Slot: Choose any I/O slot in the 1746 chassis.

3. Insert the Module: Slide the 1746-NIO4V into the slot carefully.

4. Secure the Module: Lock using the retaining latch at the top and bottom.

5. Configure Inputs Per Channel: Select voltage or current for each differential input.

6. Wire Inputs: Connect analog sensors using shielded Belden #8761 cable.

7. Wire Outputs: Connect actuators to the voltage output channels.

8. Observe Load Limits: Keep output load resistance above 1 kOhms.

9. Apply Overvoltage Protection: Do not exceed 220V AC or DC on inputs.

10. Apply Power: Turn on the chassis power supply.

11. Check Resolution: Expect 16-bit input resolution and 14-bit output resolution.

12. Test Step Response: Verify 60ms input and 2.5ms output response.

Installation Notes

• This module occupies a single slot in the SLC 500 chassis.

• Inputs are user-selectable per channel for voltage or current.

• Outputs are non-isolated voltage outputs.

• The removable terminal block simplifies wiring replacement.

• Use shielded cable for all analog signals to reduce noise.

Packaging List

This unit ships as a new and original product.

• Allen-Bradley 1746-NIO4V SLC 500 Analog Combination Module

• Removable terminal block (pre-installed)

• Product data sheet with configuration guide

• Anti-static factory packaging bag

Frequently Asked Questions (FAQ)

1. How many inputs and outputs does the 1746-NIO4V provide?
The Allen-Bradley 1746-NIO4V provides two (2) analog inputs and two (2) analog outputs. Inputs are configurable per channel for voltage or current.

2. What are the input signal ranges for this analog combination module?
The 1746-NIO4V accepts -20 to +20 mA for current inputs. For voltage inputs, it accepts -10 to +10V DC. Resolution is 16-bit for inputs.

3. What is the output resolution of the 1746-NIO4V?
The Allen-Bradley 1746-NIO4V has 14-bit output resolution at 1.22070 mV per LSB. Output voltage range is -10 to +10 volts.

4. What backplane current does this module draw?
The 1746-NIO4V draws 55 mA at 5.1 VDC and 115-145 mA at 24 VDC. Field wiring-to-backplane isolation is 500V DC.

5. Can this module be used with CompactLogix or ControlLogix systems?
Yes, the Allen-Bradley 1746-NIO4V can become part of CompactLogix and ControlLogix PACs. It acts as a distributed I/O module in those configurations.