Product Overview
Industrial automation systems often face challenges in managing distributed I/O points efficiently. The Allen-Bradley 1791-16BC block I/O module addresses this by providing a compact, self-contained solution for remote I/O architectures. Manufactured by Allen-Bradley as part of the 1791 Block I/O series, this module integrates a power supply, PLC interface, I/O connections, and signal processing circuitry into a single unit. It is designed to function as a remote I/O adapter, reducing wiring complexity and enabling flexible placement near machinery or controllers.
Technical Specifications Breakdown
Key parameters for the 1791-16BC are listed below for quick reference:
| Feature | Specification |
|---|---|
| Product Type | Block I/O |
| Number of Inputs | Sixteen (16) |
| Number of Outputs | Sixteen (16) 24VDC outputs |
| Input On-state Voltage Range | 10-30V dc |
| Output Voltage Range | 10-30VDC |
| External Power Voltage | 19.2-30VDC |
| External Power Current | 300 mA |
| Power Dissipation, maximum | 17.8 Watts |
| Thermal Dissipation, maximum | 60.6 BTU/Hr |
| Mounting | Vertical / Horizontal |
| Weight | 2.25 lbs (1.02 kg) |
Industry Applications
This module is suited for discrete manufacturing and process control environments where remote I/O is required. For example, in a packaging line, the 1791-16BC can be placed near sensors and actuators to collect input signals and control outputs, reducing long cable runs. In material handling systems, it enables efficient data exchange with a central PLC over remote I/O networks. The module's 16 input and 16 output channels provide sufficient I/O density for localized control zones.
Installation & Setup Guidance
Mount the 1791-16BC vertically or horizontally depending on your enclosure layout. Ensure a clearance of 2 inches on all sides for adequate airflow and heat dissipation. The module requires an enclosure that protects against dust, dirt, grease, oil, water, and chemicals as per the installation area's classification. Connect the module in a daisy-chain topology; it always functions as a remote I/O adapter and requires a RIO scanner to exchange data. No external power fusing is needed because the module is internally fused, but note that output channels are not fused.
Maintenance & Reliability
Regularly inspect the enclosure and module for signs of contamination or damage. Keep the environment within the module's thermal limits: at 60 degrees Celsius, vertical mounting supports 500 mA per output, while horizontal mounting supports 250 mA. Lower temperatures increase current ratings—vertical mounting can handle 1 Amp at 30 degrees Celsius, and horizontal mounting 500 mA. The maximum surge current is 3 Amps for 50 milliseconds. Periodic inspection of connections and power supply ensures long-term reliability.
Compatibility & Integration
The 1791-16BC is compatible with Allen-Bradley controller platforms such as PLC2, PLC3, PLC5, and SLC 5000. Remote I/O baud rates range from 57.6K to 230.4K baud. At 57.6K baud, maximum cable length is 10,000 feet; at 115.2K, 5,000 feet; and at 230.4K, 2,500 feet. This flexibility allows integration into various system topologies.
Selection Guide & Purchasing Advice
When selecting a block I/O module, consider the number of I/O points, voltage requirements, and mounting constraints. The 1791-16BC offers 16 inputs and 16 outputs in a compact form factor. For availability and lifecycle status, please verify with AutoDCSTech before ordering. AutoDCSTech stocks this module and can provide support for your automation needs.
Availability & Condition at AutoDCSTech
| Part Number | 1791-16BC |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
