1791-N4C2 | Allen-Bradley Block I/O Module - Petro Auto Tech

Product Overview

The 1791-N4C2 is an Allen-Bradley Block I/O module designed for industrial automation systems. This module features 6 analog I/O points, including 4 analog inputs and 2 current outputs, making it a versatile choice for precise control applications. Part of the 1791 Block I/O product line, it integrates seamlessly with PLC-2, PLC-3, and PLC-5/250 programmable controllers, ensuring reliable communication through block or discrete transfer. Petro Auto Tech offers this module to support your automation needs.

Technical Specifications Analysis

The 1791-N4C2 module delivers robust performance with key parameters derived from its datasheet. It includes 4 selectable inputs per block and 2 outputs per block, with an output impedance of less than 1 ohm. The update rate per channel is 10 ms, providing efficient data processing. With a total of 6 channels (4 input and 2 output), the module operates with a maximum power dissipation of 16.9 Watts. Its weight is 1.25 lbs (0.57 kg), and it supports a power rating of 120 Volts AC. The input impedance is 10 Megohms, and absolute accuracy is 0.1% at 25 degrees Celsius. These specs ensure stable analog signal handling.

Application Scenarios & Usage Methods

This module excels in manufacturing environments requiring analog monitoring and control. For example, in a chemical processing plant, the 4 analog inputs can measure temperature or pressure from sensors, while the 2 current outputs drive actuators. To use, configure inputs as voltage or current types via the controller program. The module communicates with SLC family controllers through discrete transfer, simplifying integration. In a packaging line, it manages conveyor speed adjustments by processing input signals and updating outputs within 10 ms per channel.

Installation Guide & Packing List

Install the 1791-N4C2 module by wiring blocks in series, avoiding parallel connections to prevent communication errors. Ensure the power supply matches the 120 Volts AC rating. Mount the module in a suitable enclosure, away from excessive vibration or moisture. The packing list typically includes the module unit and documentation. Always follow manufacturer guidelines for safe installation.

Purchasing Advice

When buying the 1791-N4C2, verify its compatibility with your controller, such as PLC-2 or PLC-5/250 systems. Its 6-channel analog capability suits applications needing precise I/O points. Petro Auto Tech provides genuine Allen-Bradley modules, ensuring reliable performance. Check your system's data transfer rates to optimize block throughput.

Repair & Maintenance Tips

Regularly inspect the module for dust or debris, cleaning with a dry cloth. Store in a dry environment with stable temperatures. Check wiring connections periodically to prevent loose terminals. Avoid exposing the module to extreme conditions beyond its rated power dissipation of 16.9 Watts. Replace if output impedance exceeds 1 ohm.

Frequently Asked Questions (FAQs)

Q: What is the update rate per channel for the 1791-N4C2?

A: The update rate per channel is 10 ms, as specified in the datasheet.

Q: How many analog inputs does the 1791-N4C2 have?

A: It has 4 analog inputs, which are selectable as voltage or current types.

Q: Can the 1791-N4C2 work with SLC controllers?

A: Yes, it communicates with SLC family controllers through a discrete transfer process.

Q: What is the maximum power dissipation of this module?

A: The maximum power dissipation is 16.9 Watts.

Q: How many outputs per block does the 1791-N4C2 feature?

A: It features 2 outputs per block, with an output impedance of less than 1 ohm.