Allen-Bradley 1790D-TN4V0 - 4-Channel Precision Voltage Input Module

Acquire accurate process data with the Allen-Bradley 1790D-TN4V0. This high-performance ArmorBlock module provides four isolated 0-10V analog voltage inputs for your DeviceNet network. With 12-bit resolution and excellent 0.2% accuracy, it's perfectly suited for monitoring sensors like potentiometers, pressure transmitters, and level sensors that output a standard voltage signal. The screw terminal block and clear status LEDs ensure easy integration and reliable operation.

Complete Technical Specifications

Brand & Series: Allen-Bradley ArmorBlock (1790 Series)

Full Model Number: 1790D-TN4V0

Module Type: 4-Channel Analog Voltage Input Module

Input Signal: 0 to +10V DC, single-ended, non-isolated between channels

Resolution: 12 bits (1 part in 4096, approx. 2.44 mV per bit)

Data Format: Binary, 0 to 4095 (0FFF hex)

Overall Accuracy: ±0.2% of full scale (0 to 55°C)

Conversion Time: 10 milliseconds per channel

Input Impedance: 500 kΩ minimum

Field Power Supply: 24V DC (+10%, 21.6V to 26.4V DC) for internal circuitry

DeviceNet Logic Power: 24V DC (11V to 28.8V DC)

Electrical Isolation: 1250V AC RMS (Field inputs to logic, Type Test)

Status Indicators: 4 Bi-color (Red/Green) LEDs, one per channel

Wiring Connection: Screw Terminal Block (M3.0, 7 lb-in max torque)

Expansion Capability: Can act as a base for up to 2 discrete expansion I/O modules.

Wire Compatibility: Copper or copper-clad aluminum conductors.

Installation & Wiring Guide

Install the 1790D-TN4V0 as a base module on your DeviceNet network. Provide a clean, stable 24V DC field power supply within the specified 21.6-26.4V range for optimal accuracy. Connect your voltage sensor's signal wire (+) to the module's input terminal and its common/negative (-) to the module's analog common terminal. Use shielded, twisted-pair cable for each analog signal to minimize electrical noise. Ground the cable shield at the sensor end only. Ensure the sensor output does not exceed 10V DC.

Package & Warranty

What's Included: 1 x Allen-Bradley 1790D-TN4V0 Analog Voltage Input Module.

Our Guarantee: This precision measurement module is backed by a reliable 12-month warranty.

Fast Shipping Service

We ship quickly worldwide using FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

What do the red and green status LEDs indicate?

Typically, a steady Green light indicates normal operation with valid input data. A Red light can signal a fault such as a wire break (open circuit), an over-range condition (>10V), or a configuration error.

Can it measure a 0-5V signal?

Yes. A 0-5V signal will use only the lower half of the 0-4095 count range (approximately 0-2047). You will need to scale the data in your controller software accordingly to represent the correct engineering units.

Why is a stable field power supply voltage so important?

The analog-to-digital converter's reference voltage is derived from the field supply. Variations in this supply voltage directly affect measurement accuracy. The tight 21.6-26.4V range ensures the 0.2% accuracy specification is met.

What is the difference between single-ended and differential input?

Single-ended inputs measure the voltage between one signal wire and a common reference. This module uses this simpler method, suitable for most industrial sensors. Differential inputs measure between two signal wires, offering better noise rejection for very long cable runs in noisy environments.

How is the analog data sent over DeviceNet?

The module converts each channel's voltage to a 12-bit digital value. These four values are packed into the module's input assembly (typically 8 bytes) and transmitted cyclically over the DeviceNet network to your scanner/controller.

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