Allen Bradley 1791-OB16 Output Dc Block I/O Module

The 1791-OB16 Output DC I/O Module is a compact digital output unit designed for Allen-Bradley block I/O architectures. It provides 16 channels of DC output, enabling efficient and organized control of actuators, valves, relays, and machine devices in distributed automation environments. Engineered for flexible mounting and compact panel footprints, it optimizes wiring density while maintaining signal reliability.

This module is particularly well-suited for applications where I/O must reside close to field devices, reducing wiring lengths and simplifying commissioning in remote or modular machine stations.

– Provides 16 discrete DC output channels
– Supports connection to relays, solenoids, and motor control elements
– Enables distributed I/O for PLC, DCS, and machine networks
– Minimizes control panel wiring density
– Enhances response time through localized output triggering

→ DIN-rail or panel-mount compact housing
→ Industrial-grade circuitry for harsh environments
→ Status indication LEDs for channel diagnostics
→ Simplified terminal layout for fast wiring
→ Suitable for modular expansion in distributed nodes

– Remote terminal I/O for packaging machinery
– Distributed automation in conveyor and sorting systems
– OEM machine builders requiring compact layouts
– Water treatment & pumping equipment
– Automotive & robotic cell integration
– Process skids and zone control stations

★Food & beverage filling lines

★Automotive assembly

★Bottling & packaging plants

★Material handling

★Chemical dosing

★Electrical equipment panel builders

Ensure correct DC voltage rating for field devices

Use shielded wires if environmental interference is expected

Consider separate fusing for high-load channels

Evaluate heat dissipation when densely mounted

Test outputs during commissioning to validate channel mapping

Common Problem

What is the primary function of the 1791-OB16 module?

To provide 16 discrete DC output channels for field devices.

Is it compatible with Allen-Bradley PLCs?

Yes-particularly systems using block I/O integration.

Do channels have status LEDs?

Yes-each output channel is monitored via LED indication.

Is output voltage fixed?

Varies per version-confirm DC rating based on application.

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