Product Details
Product Overview
The Allen Bradley 1791-N4C2 serves as a high-performance, standalone analog interface for distributed control systems. This compact block module combines data acquisition and signal output into a single rugged housing, eliminating the need for separate I/O racks. It excels in applications requiring precise PID loop control, such as temperature regulation, flow measurement, and pressure monitoring. We supply this unit as 100% Brand New, factory-sealed, and ready for immediate deployment in mission-critical automation environments.
Technical Specifications
The 1791-N4C2 features a versatile 4-channel architecture designed for high-resolution signal processing.
| Parameter | Specification |
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Configuration | 4 Channels (2 Analog Input / 2 Analog Output) |
| Resolution | 16-bit (High Precision) |
| Input/Output Types | Voltage (0–10V DC, ±10V) or Current (4–20mA, ±20mA) |
| System Accuracy | ±0.1% of Full Scale |
| Power Requirement | 24V DC (Class 2 Power) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Dimensions | 4.6 x 2.4 x 4.5 in (117 x 61 x 114 mm) |
| Mounting | 35mm DIN Rail or Panel Mount |
| Weight | 0.7 lbs (0.32 kg) |
Engineering Advantages
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Ultra-High Resolution Control: The 16-bit converter architecture provides exceptional granularity for both input sensing and output modulation. This allows engineers to detect minute process fluctuations and apply precise corrections, significantly improving product quality in chemical and pharmaceutical manufacturing.
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Dual-Signal Flexibility: Software-configurable channels support both voltage and current modes. This flexibility allows you to standardize on one spare part (1791-N4C2) to handle diverse field instruments, including 4–20mA transmitters and ±10V actuators, effectively reducing inventory overhead.
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Space-Optimized Footprint: The "Block" design integrates the network adapter and I/O circuitry into one small-form-factor device. This saves valuable DIN rail space in overcrowded remote terminal units (RTUs) and junction boxes compared to traditional modular chassis systems.
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Rapid Fault Isolation: The module features a ruggedized design that withstands typical industrial EMI/RFI interference. Its direct-mount capability near the field devices minimizes long analog cable runs, thereby reducing signal attenuation and noise pickup.
FAQs
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Can I configure inputs and outputs independently on the 1791-N4C2?
Yes. The module allows you to configure each channel for either voltage or current signals based on your specific field device requirements. This ensures seamless integration with both older legacy sensors and modern high-speed actuators.
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Does the 1791-N4C2 require an external power supply for the analog loops?
The module requires a 24V DC Class 2 power supply to drive its internal logic and signal processing. For the analog loops, the module manages the signal levels, but you must ensure the 24V DC supply provides sufficient current to maintain loop integrity across all four channels.
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What mounting options work best for high-vibration environments?
While the 1791-N4C2 supports standard 35mm DIN rail mounting for quick installation, we recommend using the integrated panel mount points for high-vibration applications. Direct bolting to the backplane provides superior mechanical stability and ensures consistent electrical contact.
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Is this module a suitable replacement for older 1791 analog blocks?
The 1791-N4C2 fits perfectly into existing Allen-Bradley Block I/O architectures. However, always verify that your controller’s communication protocol (such as Remote I/O) matches the block’s requirements to ensure full 16-bit data transparency and configuration support.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Data management serves as a cornerstone of modern industrial automation. Whether tracking materials on a conveyor or managing batch sequences in a process, engineers frequently rely on sequential logic. Two primary structures—First-In-First-Out (FIFO) and Last-In-First-Out (LIFO)—form the bedrock of this data handling. Mastering these blocks allows programmers to optimize complex machine operations efficiently.
Evolving SCADA System Architectures in Industrial Automation
A robust Supervisory Control and Data Acquisition (SCADA) system serves as the heartbeat of modern industrial operations. Understanding SCADA system architecture is vital for engineers designing efficient control systems. These architectures have evolved from isolated, monolithic structures to highly interconnected, networked ecosystems. Choosing the right design requires balancing data visibility, processing power, and long-term scalability requirements.
Choosing the Right Controller: PLC vs. Motion Controller in Industrial Automation
Selecting the optimal control architecture is a foundational decision in industrial automation. Engineers must frequently choose between a Programmable Logic Controller (PLC) and a dedicated Motion Controller. While both systems manage machinery, their underlying design philosophies differ significantly, impacting performance, scalability, and system integration.