Allen-Bradley 1791D-16V0 CompactBlock I/O Base Input Module

Product Overview

The Allen-Bradley 1791D-16V0 is a CompactBlock I/O 1791D series base input module designed for decentralized control architectures. It integrates 16 sourcing inputs, a built-in DeviceNet network adapter, and an internal power supply into a single compact unit. This module is engineered to operate standalone or with one expansion block, making it a flexible solution for PLC, SLC, or SoftLogix programmable controllers. Its small footprint allows installation in narrow enclosures, addressing space constraints common in modern industrial environments.

Technical Specifications Breakdown

Key parameters for the 1791D-16V0 are listed below for quick reference:

Industry Applications

For example, in a conveyor system, the 1791D-16V0 can monitor 16 proximity sensors near the point of control, sending status via DeviceNet to a central PLC. The sourcing input type simplifies connection to standard 24V DC sensors. In automotive assembly stations, its compact size allows mounting inside shallow control cabinets, saving valuable floor space. The built-in DeviceNet adapter eliminates the need for a separate network interface, lowering total system cost.

Installation & Setup Guidance

Mount the 1791D-16V0 in a subsidiary enclosure as required for CompactBlock I/O modules. Use the detachable screw-clamp terminal strip for wiring inputs; this feature allows block replacement without rewiring. Ensure DeviceNet power is supplied within 11-25V DC. Connect the DeviceNet trunk line to the built-in adapter. For expansion, attach one analog or digital compact I/O block to the side connector. Follow electrostatic discharge (ESD) precautions during handling to prevent internal damage.

Maintenance & Reliability

The module includes a color-based Logic Status Indicator for diagnostics: solid green indicates logic enabled; flashing green means logic enabled with local forces; off signifies logic disabled. Inspect the terminal strip connections periodically for tightness. Keep the IP20 enclosure free of dust and moisture. No routine calibration is required. The module's solid-state design provides long service life in typical industrial environments.

Compatibility & Integration

The 1791D-16V0 communicates via DeviceNet, a widely adopted open network. It is compatible with PLC, SLC, and SoftLogix controllers from Allen-Bradley. The module produces 2 input bytes when standalone, 5 input bytes with an expansion input module, and 3 input bytes with 2 output bytes when paired with an expansion output module. It supports up to one expansion block, offering scalable I/O counts.

Selection Guide & Purchasing Advice

When selecting the 1791D-16V0, verify that your application requires 16 sourcing inputs and DeviceNet connectivity. If you need additional I/O, plan for one expansion module. Please verify current lifecycle status and availability with AutoDCSTech before ordering. AutoDCSTech stocks this module and can advise on compatible expansion blocks and accessories to complete your system.