Product Details
Product Description
The 1771-OBN is a high-density digital output solution designed for the legacy Allen-Bradley PLC-5 chassis architecture. This module provides 32 sourcing outputs, organized into four isolated groups of eight channels each. Engineered for reliability in demanding industrial environments, the 1771-OBN features conformal coating to protect internal circuitry from moisture and contaminants. It is primarily used to drive high-current DC loads such as solenoids, motor starters, and indicators directly from the PLC backplane, supporting both BCD and Natural Binary data formats for flexible system integration.
Detailed Technical Specifications
-
Module Function: Digital DC Sourcing Output
-
Catalog Number: 1771-OBN
-
I/O Density: 32 Outputs (4 sets of 8 points)
-
Voltage Category: 10V to 60V DC Sourcing
-
Operating Voltage Range: 10V to 30V DC
-
Backplane Current Load: 330 mA at 5V DC
-
Maximum Output Current: 0.5 Amps per channel (continuous)
-
Group Current Limit: 2.0 Amps per set of 8 outputs
-
Total Module Capacity: 8.0 Amps maximum
-
Signal Propagation Delay: 50 ms (Off-to-On / On-to-Off)
-
On-State Voltage Drop: 1.5V DC at 0.5A
-
Off-State Leakage Current: 1.0 mA maximum
-
Wiring Arm Requirement: 1771-WH
-
Circuit Protection: Conformal Coated (Standard)
-
Mounting Style: 1771 Universal I/O Chassis (Rack Mount)
-
Product Weight: 0.94 kg (2.06 lbs)
Module Comparison and Installation FAQ
How does the 1771-OBN differ from the 1771-OB16?While both are DC output modules, the 1771-OBN doubles the point density with 32 outputs compared to the 16 outputs on the 1771-OB16. This allows for significant space savings within the 1771 rack, though it requires more careful management of current limits per group to ensure thermal stability.
What is the purpose of the conformal coating on this specific module?The "N" designation often indicates enhanced protection. The conformal coating provides a thin polymeric film over the circuit board, which shields the 1771-OBN from environmental stressors like salt spray, humidity, and chemical vapors, which is critical for longevity in wastewater or chemical processing plants.
Does this module require an external power supply?Yes. While the logic side of the 1771-OBN is powered by the 1771 backplane, the field-side DC power for the 32 outputs must be supplied externally through the 1771-WH wiring arm to maintain isolation between the PLC processor and the field devices.
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
Understanding Types of Noise in Electronic Circuits and Control Systems
Signal integrity directly determines measurement accuracy and loop stability across industrial automation environments. Electronic noise introduces unwanted stochastic interference into analog loops, sensor feedback lines, and digital fieldbus networks. Understanding how intrinsic electronic noise and external electromagnetic interference manifest allows control engineers to optimize signal conditioning and shield sensitive instrumentation effectively.
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.
Essential Motion Control Commands: A Practical Guide for Engineers
Automation engineers often rely on precise position and speed control to drive modern factory machinery. Modern industrial systems, such as Programmable Logic Controllers (PLCs) and Distributed Control Systems (DCS), depend heavily on standardized motion instructions. Mastering these commands ensures operational safety, protects mechanical components, and optimizes cycle times across production lines.