Compact 24V DC Input Hub: Allen-Bradley 1791-16B0

Key Features & Benefits

• Saves Panel Space: A complete 16-point input interface in one small block.
• Easy Wiring & Maintenance: Features a removable terminal strip for quick connections.
• Wide PLC Compatibility: Works with PLC-5, SLC, and other classic Allen-Bradley controllers.
• Simple Network Integration: Built-in adapter lets you daisy-chain modules to a scanner.
• Clear Diagnostics: Status indicators and DIP switches on the front help with setup and troubleshooting.

Detailed Technical Specifications

• Manufacturer & Brand: Allen-Bradley.
• Model & Series: 1791-16B0, from the 1791 Block I/O family.
• Product Type: 24V DC Sinking/Sourcing Input Module.
• Input Channels: Sixteen (16) discrete inputs.
• Input Voltage Rating: 24 Volts DC nominal.
• Input Impedance: 3.4 Kilo-ohms (maximum).
• On-State Input Current: Typically 7 mA at 24V DC.
• Off-State Voltage (Max): 5 Volts DC.
• Response Time: Fast scan for real-time control response.
• Module Weight: 1.00 lb (0.45 kg).
• Internal Power Supply: Converts input power for processor use.
• Isolation Rating: Provides protection between field wiring and logic.

Package Contents & Shipping

• One (1) new 1791-16B0 DC Input Module.
• This product is covered by a 12-month warranty.
• Free shipping is not included. We ship via FedEx, UPS, and DHL.
• You will receive a tracking number after your order ships.

Simple Installation Steps

• Mount the module on a DIN rail or panel in your enclosure.
• Use the two captive screws to remove the terminal strip for wiring.
• Connect your 24V DC field devices (like sensors and switches).
• Set the I/O rack number and other settings using the front DIP switches.
• Daisy-chain the communication cable to the next Block I/O or scanner.
• Apply power and check the status LED for proper operation.

Professional FAQ

• Q: Is this a sinking or sourcing input module?
  A: The 1791-16B0 is designed to work with both sinking and sourcing 24V DC field devices.
• Q: Can I use it with a modern CompactLogix or ControlLogix?
  A: It connects via a Remote I/O scanner. You need a compatible scanner module in your Logix chassis.
• Q: What is the input delay or filter time?
  A: It has a fast response typical of Block I/O, with minimal delay for state changes.
• Q: How do I set the module's address?
  A: Use the DIP switch assemblies behind the front cover to set the I/O rack number.
• Q: What happens if I lose communication?
  A: You can configure the DIP switches to hold the last state or turn off all inputs.

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Author: Ubest Automation
Contact: sales@ubestplc.com | Phone: +86 180 3000 5825