Allen-Bradley 1771-ID16 Isolated AC/DC Input Module | PLC-5 16-Point 120V Digital I/O Card

Allen-Bradley 1771-ID16 Isolated AC/DC Input Module Overview

The Allen-Bradley 1771-ID16 is a premium isolated AC/DC input module engineered for demanding industrial automation applications within PLC-5 control systems. This 16-point digital input card delivers exceptional signal isolation and versatile voltage compatibility, making it the ideal solution for monitoring discrete field devices in harsh electrical environments.

Technical Specifications

• Model Number: 1771-ID16
• Input Points: 16 isolated AC/DC inputs
• Voltage Range: 74-138V AC/DC
• Nominal Voltage: 120V AC/DC
• Isolation: Channel-to-channel and channel-to-backplane isolation
• Input Current: 7mA typical at 120V AC/DC
• Response Time: 20ms ON delay, 20ms OFF delay (typical)
• Compatibility: Allen-Bradley PLC-5 family processors
• Mounting: 1771 I/O chassis compatible
• Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)

Application Scenarios

The 1771-ID16 excels in industrial environments requiring reliable monitoring of AC/DC field devices including limit switches, proximity sensors, photoelectric sensors, push buttons, and selector switches. Common applications include:

• Manufacturing assembly line control and monitoring
• Material handling conveyor systems
• Packaging machinery automation
• Process control valve position feedback
• Safety interlock monitoring systems
• Motor control center status indication
• HVAC system monitoring in industrial facilities

Engineering Solutions

Electrical Isolation Protection: Each input channel features optical isolation to protect your PLC-5 processor from voltage spikes, ground loops, and electrical noise commonly found in industrial power distribution systems.

Universal Voltage Compatibility: The wide 74-138V AC/DC input range accommodates voltage variations and allows connection to both AC and DC field devices without additional interface circuitry, reducing installation costs and complexity.

Simplified Wiring: The module’s removable terminal block design enables pre-wiring and quick module replacement during maintenance, minimizing system downtime.

Product FAQ

Q: Can the 1771-ID16 accept both AC and DC inputs simultaneously?
A: Yes, the module accepts both AC and DC signals within the 74-138V range on any input point, providing maximum flexibility for mixed-signal applications.

Q: What is the maximum cable length for field device connections?
A: For reliable operation, we recommend maximum cable lengths of 300 meters (1000 feet) using shielded twisted-pair cable with proper grounding practices.

Q: Is this module compatible with ControlLogix systems?
A: No, the 1771-ID16 is designed exclusively for PLC-5 systems using 1771 I/O chassis. For ControlLogix applications, consider the 1756 series input modules.

Q: Does the module require external power supplies?
A: No external power supply is needed. The module draws power from the 1771 chassis backplane and input signals are powered by the connected field devices.

Quality Assurance & Warranty

Every 1771-ID16 module undergoes rigorous factory calibration and testing to ensure compliance with Allen-Bradley specifications. Our OEM-quality units meet industrial standards for reliability and performance. Each module includes a comprehensive 12-month warranty covering manufacturing defects and workmanship, providing peace of mind for your critical automation investments.

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