1791-16A0 Allen-Bradley Block I/O 120V AC Input Module

Allen‑Bradley 1791‑16A0 120V AC Input Block I/O Module

Key Technical Specifications

• Input channels: 16 (two groups of eight), 79‑132 VAC, 47‑63 Hz; nominal 120 VAC.
• Input on‑state current: 5 mA minimum at 79 V; off‑state current ≤ 2.3 mA.
• Off‑state voltage: Maximum 35 VAC ensures reliable off‑state detection.
• External power required: 85‑132 VAC, 47‑63 Hz, 150 mA continuous.
• Surge current: 10 A for 50 ms, repeatable every two seconds.
• Temperature rating: Operates up to 60 °C (140 °F).

Installation, Mounting, and Wiring

• Mount the 1791‑16A0 vertically or horizontally. Maintain 2 inches (58 cm) clearance on all sides for adequate ventilation.
• Maximum output rating (auxiliary supply) is 600 mA at 30 °C, derating to 300 mA at 60 °C.
• The block I/O contains built‑in functionalities of an I/O rack, adapter, and power supply, simplifying installation.
• Compatible with 1771 series output modules (e.g., 1771‑OAN, 1771‑OD16, 1771‑ODD, 1771‑ODZ) when off‑state leakage and voltage drop requirements match.
• Use appropriate field wiring (14 AWG recommended) for reliable connections.

Frequently Asked Questions

• What is the input voltage range of the 1791‑16A0?
  It accepts 79‑132 VAC, 47‑63 Hz, with a nominal 120 VAC. External power must be 85‑132 VAC.
• How are the inputs grouped?
  The 1791‑16A0 has two isolated groups of eight inputs each.
• Which field devices can I connect?
  It works with proximity switches, limit switches, selector switches, float switches, pushbutton switches, and auxiliary contacts.
• What are the clearance requirements for mounting?
  Allow at least 2 inches (58 cm) of free space on all sides for proper airflow and cooling.
• Is this module compatible with 1771 output modules?
  Yes, with modules like 1771‑OAN, 1771‑OD16, 1771‑ODD, and 1771‑ODZ, provided the off‑state leakage current is below 2.3 mA and the on‑state voltage meets requirements.
• How does the 1791‑16A0 communicate with a controller?
  It installs in a daisy‑chain configuration to a scanner in the network; inputs are asynchronously scanned and transferred to the controller.
• Do you offer same‑day shipping?
  We dispatch within five days via FedEx, UPS, or DHL. Stock is available.

For further assistance, contact our sales team: sales@nex-auto.com or +86 153 9242 9628 (WhatsApp).
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