The Allen-Bradley 1791-16BC, also cataloged as the 1791-16BC Block I/O Module, operates as a dedicated hardware component for high-density digital signal interfacing within distributed I/O network platforms. The module provides 16 digital inputs organized into two groups of 8 and 16 digital outputs, executing logic state transitions based on a 10-30 VDC field power supply.

Hardware Specifications

Deterministic Industrial Control Integration

The 1791-16BC architecture utilizes hardened circuit designs to ensure signal stability in high-noise environments. Integration within Allen-Bradley control ecosystems relies on deterministic fieldbus timing, ensuring that I/O density scaling does not impact cyclic update rates. Firmware compatibility across the 1791-16BC/B and 1791-16BC/C revisions maintains backward compatibility with legacy control systems while adhering to established input voltage thresholds.

Ordering Information

• Includes: One (1) 1791-16BC I/O Block Module.

• Note: This unit was discontinued by the manufacturer effective 06/30/2015.

• Additional components: Requires external field connectors for I/O signal termination.

Field Installation Protocols

• Mounting: Secure the block module to a vibration-dampened surface using the provided mounting holes to maintain structural integrity.

• Grounding: Connect the chassis ground terminal to a common reference ground to prevent potential differences between the module and field devices.

• Wiring: Ensure wire gauges are compliant with local electrical codes for 24 VDC operation; observe current ratings to prevent thermal accumulation.

• Signal separation: Isolate input and output signal bundles from high-voltage AC cabling to minimize inductive noise injection.

Delivery Information

• Delivery time: 2-7 days when payment finish.

• Shipment: Transported via DHL/FEDEX/UPS.

• Packaging: Utilization of anti-static industrial packaging to prevent electrostatic discharge and mechanical stress during transit.

Frequently Asked Questions

Q: Are the 16 inputs and 16 outputs isolated from each other?

A: The inputs are grouped into two sets of 8. Logic and field power isolation should be verified against the specific hardware revision (e.g., 1791-16BC/B).

Q: Can this module be used in hot-swap configurations?

A: No, this block I/O module does not support hot-swapping; power must be isolated from the unit before removing or installing the device.

Q: What is the maximum voltage ripple recommended for the 24 VDC supply?

A: To ensure reliable operation and prevent false triggering of inputs, keep the supply ripple within 5% of the nominal 24 VDC.