All-in-One I/O Power: Allen-Bradley 1791-16AC

Top Product Features & Why It's Great

• Complete I/O Solution: Get 16 digital inputs and 16 digital outputs in one unit.
• Built for Remote Systems: Has a built-in Remote I/O adapter. It connects easily to your main controller.
• Mount It Your Way: Install it vertically or horizontally to fit your panel space.
• Strong & Reliable: High isolation voltage (up to 1250VAC) protects your system.
• Handles Surges Well: Manages inrush currents from motors and solenoids safely.

Key Technical Data You Need

• Part Number & Brand: 1791-16AC by Allen-Bradley.
• Product Line: Part of the 1791 Block I/O series.
• Input Channels: Sixteen (16) channels, 120VAC.
• Output Channels: Sixteen (16) channels, 120VAC.
• Voltage Range (I/O): Inputs: 79-132VAC. Outputs: 20-132VAC.
• Power Supply Needed: 85 to 132 Volts AC, 47-63 Hz.
• Response Speed: Input ON delay: 1.0 ms. Output ON delay: 1.0 ms.
• Heat Management: Maximum power dissipation is 31.3 Watts.
• Current Ratings: Output current changes with mounting (see FAQ).
• Connection Topology: Uses a simple daisy-chain network connection.

What's in the Box & How We Ship

• One (1) Allen-Bradley 1791-16AC Block I/O module.
• All modules include our 12-month warranty.
• We ship fast with FedEx, UPS, or DHL.
• Tracking information is provided for every order.

Easy Installation Guide

• Choose a clean, dry location inside a control cabinet.
• You can mount the module vertically or horizontally.
• Leave at least 2 inches of space around it for air flow.
• Connect your 120VAC field devices to the correct terminals.
• Use the daisy-chain port to link it to your network.
• Always follow the official Allen-Bradley wiring diagrams.

Expert Answers to Your Questions (FAQ)

• Q: How does mounting affect the output current?
  A: Vertical mounting gives higher current. You get 600mA at 30°C. Horizontal mounting gives 300mA at 30°C.
• Q: What is the isolation voltage rating?
  A: It has strong isolation: 500VAC (power to comms) and 1250VAC (between I/O groups).
• Q: Can I connect motor starters directly?
  A: Yes, but check the inrush current. The outputs handle surges well for solenoid devices.
• Q: What is the turn-off delay for outputs?
  A: The output OFF delay is about 8.3 ms at 60 Hz power frequency.
• Q: Is special software needed to configure it?
  A: No special software is needed for basic Remote I/O (RIO) adapter mode operation.

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