Allen-Bradley 1791-32A0: High-Density AC Input Module

Key Product Specifications

• Brand & Model: Allen-Bradley 1791-32A0
• Module Type: Discrete AC Input Only
• Total Input Channels: 32 Channels in 4 groups of 8.
• Nominal Voltage: 120V AC at 47-63 Hz.
• On-State Voltage Range: 79 to 132V AC.
• Input Current: 11 mA nominal, 12.3 mA max at 132V AC.
• Input Impedance: 15 kΩ at 60 Hz.
• Communication: Built-in Remote I/O (RIO) port.
• Module Power: 85-132V AC external supply (150 mA).

Performance & Electrical Details

• Off-State Voltage: Maximum 35V AC.
• Response Time: 1 ms turn ON, max 26 ms turn OFF.
• Power Dissipation: 13.62 Watts maximum.
• Isolation Rating: 1250V AC (I/O to logic), 500V AC (power to RIO).
• Wire Size: Use 14 AWG stranded wire for connections.

Environmental & Physical Data

• Operating Temperature: 0°C to 60°C (32°F to 140°F).
• Storage Temperature: -40°C to 85°C.
• Humidity: 5% to 95%, non-condensing.
• Dimensions: 6.95" x 4.35" x 3.85".
• Weight: 2.00 lbs (0.91 kg).
• Mounting: DIN rail or panel mount.

Setup & Compatibility

• Controller Support: PLC-2, PLC-3, PLC-5, and SLC 5/02 families.
• Configuration: Two DIP switches set RIO rack number and baud rate.
• Termination: Removable terminal strips on both sides for easy wiring.
• Status Indicators: LEDs show network and input status.

Packaging & Shipping

• One Allen-Bradley 1791-32A0 I/O Module.
• Installation guide and product documentation.
• Global Shipping: Fast delivery via FedEx, UPS, or DHL.
• Warranty: Backed by a 12-month manufacturer's warranty.

Professional FAQ

• What is the main use for the 1791-32A0? It is perfect for gathering many AC status signals, like from limit switches or pushbuttons, in one location.
• How fast can the module detect an input change? It sees a signal turn ON in 1 millisecond. It needs up to 26 ms to see a signal turn OFF.
• Can I use this module in a wet area? No. It is for indoor use in a dry, non-condensing environment only.
• What happens if my input voltage is below 79V AC? The module may not recognize the input as ON. Ensure your sensor voltage is within the 79-132V AC range.
• Do I need a separate power supply for the module logic? No. The single 85-132V AC supply powers both the module electronics and the input circuits.

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