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

Product Overview

When precise voltage monitoring is critical for your automation system, the Allen-Bradley 1790D-TN4V0 delivers reliable performance. This 4-channel analog voltage input module accepts 0…10V signals and provides 12-bit resolution for accurate data conversion. Designed for industrial environments, the 1790D-TN4V0 integrates seamlessly with DeviceNet networks, making it a practical choice for distributed control applications.

Part of the Allen-Bradley 1790D series, this module is built for durability and ease of use. It supports single-ended, nonisolated inputs and offers fast conversion times to keep your processes running smoothly. Whether you are upgrading an existing system or building a new one, the 1790D-TN4V0 provides the precision and reliability you need.

Technical Specifications

The 1790D-TN4V0 offers four single-ended, nonisolated analog input channels with a 0…10V input voltage range. Resolution is 12 bits unipolar, providing 1/4096 of full scale with 2.44 mV per bit. Converted data appears as binary values from 0000 to 0FFF (max scale). Conversion time is 10 ms per channel, ensuring responsive monitoring.

Overall accuracy is 0.2% of full scale over 0…55 °C. Input impedance is 500 KΩ minimum, and insulation resistance is 20 MΩ minimum at 250V DC between insulated circuits. The module requires no calibration, simplifying setup and maintenance.

Power is supplied via DeviceNet with a nominal 24V DC voltage and a range of 11…28.8V DC. Maximum power dissipation is 1.2 W at 28.8V DC. Field power also requires 24V DC nominal, with a range of 21.6…26.4V DC (+10%) and maximum dissipation of 1.5 W at 26.4V DC. Isolation between I/O and logic uses photocoupler isolation with a type test of 1250V AC rms for 60 seconds. DeviceNet to logic and field power are nonisolated.

Four red/green I/O status indicators provide clear visual feedback. Wiring uses a terminal block with M3.0 screws and a maximum screw torque of 7 lb-in. Use copper or copper-clad aluminum conductors.

Industry Applications

The 1790D-TN4V0 excels in applications requiring precise voltage measurement and monitoring. Common use cases include:

Process Control: Monitor sensor outputs such as pressure transducers or level transmitters that provide 0…10V signals. The 12-bit resolution ensures accurate data for closed-loop control.

Machine Automation: Integrate with PLCs and HMIs to track machine performance parameters like speed or position feedback. Fast 10 ms per channel conversion supports real-time adjustments.

Energy Management: Measure voltage levels from analog sensors in power monitoring systems. The wide input impedance minimizes signal loading.

By choosing the 1790D-TN4V0, you reduce the risk of signal errors and improve overall system reliability.

Installation & Setup Guidance

Mount the 1790D-TN4V0 on a DIN rail or panel using the provided mounting hardware. Ensure adequate ventilation and avoid exposure to excessive vibration or moisture. Connect the DeviceNet cable to the module's communication port, observing proper wiring polarity and termination practices.

For field power, use a 24V DC supply within the 21.6…26.4V DC range. Wire analog inputs using shielded twisted-pair cables to minimize noise. Tighten terminal block screws to 7 lb-in maximum. The module can accommodate a maximum of two discrete expansion modules, allowing system scalability.

After wiring, apply power and verify the I/O status indicators. The module requires no calibration, so you can begin data acquisition immediately. Configure the DeviceNet network address and baud rate using the module's DIP switches or software tools as needed.

Maintenance & Reliability

The 1790D-TN4V0 is designed for long-term, maintenance-free operation. No calibration is required, reducing downtime and labor costs. Periodically inspect the module for dust accumulation or loose connections. Clean the enclosure with a dry cloth if necessary.

Ensure the ambient temperature stays within 0…55 °C for optimal accuracy. The module's robust isolation (1250V AC rms) protects against voltage transients, enhancing system reliability. By following these simple practices, you extend the service life of your investment.

Selection Guide & Purchasing Advice

Before purchasing the 1790D-TN4V0, verify that your system uses DeviceNet communication and requires 4-channel analog voltage input. Confirm that the field power supply meets the 24V DC nominal requirement. The module supports up to two expansion modules, so plan your I/O count accordingly.

BluePLC Industrial stocks the Allen-Bradley 1790D-TN4V0 and offers competitive pricing and fast shipping. Contact our team for current availability and lead times. We are your trusted partner for industrial automation parts.