Allen-Bradley 1771-IA PLC5 Discrete Input Module 120VAC

Allen-Bradley 1771-IA 120V AC/DC Discrete Input Module – PLC5 Series

Key Technical Specifications

• Brand: Allen-Bradley | Catalog No.: 1771-IA
• Module Type: 8-channel digital AC/DC input module for 1771-IA PLC5 systems.
• Voltage Range: Operates from 87-138V AC (47-63 Hz) and 97-138V DC. Nominal current: 6.83mA @120V AC 50Hz, 7.9mA @120V AC 60Hz, 7.4mA @125V DC.
• Signal Delays: AC On delay typically 24ms (±10ms). DC On delay 10ms (±4ms); DC Off delay 20ms (±9ms). Provides input filtering to reduce electrical noise.
• Isolation & Protection: Optoelectrical isolation between field and logic. Maximum Off-state current: 2.8mA ensures reliable off-state detection.
• Backplane Load: Draws only 75mA from the 1771 chassis backplane. Power dissipation max 10.7W (36.5 BTU/hr).
• Physical & Environmental: Dimensions 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm). Keying bands between pins 10-12 (upper) and 4-6 (lower) for proper slot placement.
• Agency Certifications: CSA Class I, Div. 2, UL listed, CE marked for applicable directives.

Frequently Asked Questions (FAQ)

• Q: Is the Allen-Bradley 1771-IA compatible with 24V DC sensors?
  A: No, the 1771-IA requires 120V AC or 125V DC nominal. Minimum DC operating voltage is 97V, so it does not work with 24V signals.
• Q: What does the On-state voltage range mean for my application?
  A: It means the module reliably detects an ON condition between 87-138V AC or 97-138V DC. Voltages below these thresholds may not register correctly.
• Q: Can I replace the module without rewiring?
  A: Yes. Disconnect the 1771-WA wiring arm, replace the 1771-IA module, then reattach the arm. Your existing field wiring stays intact.
• Q: What is the maximum input current?
  A: At 120V AC 60Hz, the typical input current is 7.9mA. At 125V DC, it is 7.4mA. The module limits current internally.
• Q: Do you ship internationally, and what is the return policy?
  A: Yes, we ship worldwide via FedEx, UPS, or DHL. We offer a 30-day return window for this 1771-IA module in its original condition.

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