Buy Allen-Bradley 1791-NDV Analog Block I/O 4 Input 2 Output

1791-NDV Allen-Bradley Analog Block I/O 4-Input 2-Output Module

The 1791-NDV serves as a high-precision 24V DC analog interface within the Allen-Bradley 1791 Block I/O family. This compact unit integrates 4 high-impedance input channels and 2 precision voltage outputs, delivering a robust 14-bit resolution for demanding signal processing tasks. Designed for remote installation, the 1791-NDV minimizes wiring complexity while maintaining 0.1% absolute accuracy and high linearity across its full operating temperature range.

Oiltech Controls’ Insight

• Engineering teams select the 1791-NDV for applications requiring fast 108ms per channel update rates and stable analog feedback.
• The module excels in environments with high electrical noise due to its 5 Hertz input bandwidth and 140V AC overvoltage protection.
• This hardware is perfectly suited for Allen-Bradley PLC-5, SLC 500, and MicroLogix systems using Universal Remote I/O links.
• We recommend this block for PID loops, pressure monitoring, and variable speed drive control in packaging or assembly lines.
• The integrated 249-Ohm input current shunt simplifies 4-20mA loop integration but requires strict adherence to the 0.25W power rating.

Core Technical Parameters

• Manufacturer: Allen-Bradley / Rockwell Automation
• Model Number: 1791-NDV
• I/O Configuration: 4 Inputs / 2 Voltage Outputs
• Resolution: 14 Bits Full Scale
• Input Impedance: 10 Megohm (Voltage) / 250 Ohms (Current)
• Accuracy: 0.1% Absolute Accuracy at 25°C
• Linearity: 0.05% at 25°C
• Output Impedance: Less than 1 Ohm
• Power Dissipation: 11.52 Watts
• Thermal Dissipation: 39.28 BTU/hr
• External Power: 19.2 to 30 Volts DC (600mA)

Environmental & Physical Build

• Operating Temperature: 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit).
• Storage Temperature: -40 to 85 degrees Celsius for long-term component preservation.
• Humidity Range: 5 to 95% non-condensing for reliable operation in humid factory floors.
• Dimensions: 6.95 inches Height x 2.7 inches Width x 3.85 inches Depth.
• Protection: Indefinite short circuit protection on output channels for enhanced durability.

Global Logistics & Support

• Condition: All 1791-NDV units undergo rigorous testing and include a 12-month warranty for peace of mind.
• Shipping Lead Time: Orders typically ship within 24-28 hours upon payment verification.
• Carrier Options: We utilize express global shipping via FedEx, UPS, and DHL.
• Email Contact: Reach us at info@oiltechcontrols.com for technical data sheets.
• Direct Chat: Contact our specialists via WhatsApp: +86 158 8020 0923 for immediate stock checks.
• Author: Technical review provided by Oiltech Controls engineering department.

FAQ: Troubleshooting & Selection Guide

• How does the 1791-NDV handle signal interference in long-distance runs?The module utilizes a 5Hz input bandwidth filter to reject high-frequency noise common in industrial motor environments.
• What is the critical precaution for the 249-Ohm input current shunt?You must ensure the input signal never exceeds the 0.25W rating to prevent permanent thermal damage to the internal shunt.
• Which power supply is recommended for the 1791-NDV external 24V DC requirement?Use a regulated industrial power supply providing stable 19.2-30V DC to ensure the 14-bit resolution remains accurate.
• Can this module be used for both voltage and current inputs?Yes, it supports voltage inputs at 10 Megohms and current inputs via the internal 250-Ohm precision resistors.
• What should I check if my analog output shows 0V despite the controller signal?Verify the external power status and check for short circuits, as the module features indefinite short circuit protection.

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