Configured for discrete 120 VAC input signal acquisition within Allen-Bradley industrial control networks, the Allen-Bradley 1791-16A0/A (1791-16A0 Block I/O Input Module) provides direct physical electrical execution.

Suffix Breakdown & Model Matrix

• 1791: Base product family identifier designating Allen-Bradley block I/O hardware platforms.
• 16A0: Configuration designator indicating a 16-channel 120 VAC input circuit topology.
• /A: Major hardware revision level suffix indicating the initial production release line of the printed circuit board assembly.

Hardware Specifications

Industrial Control & Drive Interface Integration

Designed for integration into deterministic networks, the module interfaces directly with backplane communication buses. It handles deterministic state updates for alternating current field devices, maintaining timing synchronization across connected control nodes without firmware flash conflicts.

Package Ordering Information

• 1 x 1791-16A0/A Block I/O Input Module unit
• 1 x Removable screw-clamp terminal block housing

Field Installation Guidelines

• DIN-Rail Mounting: Secure the module firmly onto standard 35 mm DIN rails, ensuring the mechanical latch locks completely into position before wiring.
• Shielding and Grounding: Terminate all incoming 120 VAC signal cable shields directly to the designated enclosure grounding bar to mitigate electromagnetic interference.
• Clearance Requirements: Maintain a minimum horizontal and vertical clearance of 50 mm around the ventilation housing to support natural thermal heat dissipation.

Frequently Asked Questions

• What is the nominal input voltage rating for this module?

The module accepts a nominal input voltage of 120 VAC operating at 50 or 60 Hz frequencies.

• How many input channels are available on the 1791-16A0/A?

The unit features a total of 16 discrete input channels configured in a high-density block layout.

• What is the current consumption drawn from the internal backplane?

The module draws approximately 150 mA of current from the system backplane during active operation.

• Is this specific block I/O module currently active or discontinued?

This hardware item is officially discontinued by the manufacturer and is typically sourced as legacy spare stock.

• What is the exact physical weight of the hardware unit?

The unboxed module weighs 0.5 kg, with overall shipping dimensions measuring 7.6 x 17.8 x 10.2 cm.

• What country is designated as the origin of manufacture?

The module is manufactured in the United States.

• Can field wiring terminals be disconnected while power is applied?

Hot-swapping AC field wiring carries electrical hazards and must be performed only after complete power isolation to prevent arc flash or equipment damage.

• What is the standard operating temperature boundary for this hardware?

The unit operates reliably within an ambient temperature range of 0 deg C to 55 deg C.