Product Details
Overview
The Allen-Bradley 1771-OMD is a 16-point AC output module designed for the PLC-5 series, providing reliable control of 220V AC loads. It offers precise switching, robust surge handling, and strong electrical isolation to ensure stable operation in demanding industrial environments. Its compatibility with multiple I/O chassis makes it suitable for diverse automation systems such as manufacturing, utilities, and process control.
Key Features
• Outputs: Sixteen individually controlled AC points for flexible load switching
• Voltage Range: 184 to 250V AC at 47–63Hz
• Current Rating: 2A per output, total 8A maximum per module
• Surge Capacity: 25A per output or per module for 100ms duration
• On-State Voltage Drop: 1.5V at 2A (maximum)
• Off-State Leakage: 4mA at 220V AC (maximum)
• Switching Speed: 1.0ms (off to on), 8.3–9.1ms (on to off) at 60Hz
• Power Dissipation: 3.7W minimum, 17.3W maximum
• Thermal Dissipation: 12.6–59.0 BTU/hr
• Backplane Current: 700mA at 5V DC ±5%
Electrical and Safety Specifications
• Isolation Voltage: Meets UL 508 and CSA C22.2 No.142 standards
• Minimum Load Current: 10mA per output at 220V AC, 60Hz
• Fuse Rating: 10A, 250V rectifier fuse (Littelfuse PN 322010 3AB)
• Wiring Arms: Standard 1771-WH or fused 1771-WHF / 1771-WHFB options
• Wire Size: Up to 14 AWG (2mm²) stranded conductors
• Insulation Thickness: Maximum 1.2mm (3/64 inch)
• Screw Torque: 7–9 inch-pounds
Environmental Ratings
• Operating Temperature: 0 to 60°C (32 to 140°F)
• Storage Temperature: -40 to 85°C (-40 to 185°F)
• Relative Humidity: 5 to 95% non-condensing
Compatible Chassis
• Supported Models: 1771-A1B through 1771-A4B or later
• Additional Options: 1771-AM1 and 1771-AM2 I/O chassis
Applications
The 1771-OMD module is widely used in industrial automation and control systems where precise AC switching is required.
• Process Control: Ideal for automated manufacturing and assembly lines
• Motor & Solenoid Control: Suitable for high-reliability actuation systems
• Power Management: Integrates into energy and equipment distribution setups
• HVAC Systems: Used in environmental and building automation
Advantages
• Reliability: Stable performance under continuous heavy load operation
• Protection: Excellent surge handling for extended service life
• Installation: Compatible with standard and fused wiring arms for flexibility
• Integration: Fully supports existing PLC-5 architectures
FAQ
Q1: Can the 1771-OMD operate with mixed voltage sources?
A1: No. All outputs must share the same AC voltage source within 184–250V AC.
Q2: Does the module have integrated fuses?
A2: The standard version uses the unfused 1771-WH wiring arm. For additional protection, fused wiring arms 1771-WHF or 1771-WHFB are available.
Q3: What wire specifications are recommended?
A3: Use stranded copper conductors up to 14 AWG with insulation not exceeding 1.2mm thickness.
Q4: What certifications does this module meet?
A4: The 1771-OMD complies with UL 508 and CSA C22.2 No.142 industrial control standards.
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
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.