Configured for safety input acquisition and safety output control in DeviceNet industrial networks, the Allen-Bradley 1791-DSIB8XOB8 (1791-DSIB8XOB8 Compact Block Module) provides direct physical/electrical execution for distributed safety I/O operations.

Model Identification

The 1791-DSIB8XOB8 is a Compact Block I/O module designed for DeviceNet communication. It integrates 8 safety inputs with current sinking configuration and 8 safety outputs with current sourcing configuration in a 24 VDC I/O assembly.

Hardware Specifications

EtherNet/IP and Industrial Control Integration

The Allen-Bradley POINT and Block I/O product families are designed around modular industrial control architectures. The 1791-DSIB8XOB8 uses DeviceNet communication for distributed safety signal exchange and supports I/O density scaling within networked control systems.

The module architecture separates safety input monitoring and output switching functions, allowing PLC safety controllers to process field device signals through a dedicated communication interface. DeviceNet network configuration parameters must match the connected scanner or controller settings before operation.

Ordering Information

• 1 x Allen-Bradley 1791-DSIB8XOB8 Compact Block Module
• 1 x Factory-installed electronics assembly
• 1 x Integrated DeviceNet communication interface
• 1 x Safety I/O terminal connection interface

Field Installation Guidelines

Mechanical Installation

• Mount the module according to the specified industrial enclosure and installation requirements.
• Verify physical clearance for DeviceNet connectors and field wiring access.
• Secure the module before connecting field circuits.

Electrical Connection

• Use 24 VDC supply wiring according to the module electrical requirements.
• Separate safety I/O wiring from high-voltage power conductors.
• Confirm correct polarity for current sinking inputs and current sourcing outputs.
• Connect DeviceNet wiring with proper shield grounding practices.

Configuration Checks

• Verify DeviceNet node addressing before commissioning.
• Confirm safety controller configuration matches the installed I/O structure.
• Validate input and output status feedback after power-up.

Frequently Asked Questions

• What type of communication does the 1791-DSIB8XOB8 use?

The module communicates through DeviceNet networks and exchanges safety I/O data with compatible Allen-Bradley controllers.

• How many safety inputs are available on this module?

The 1791-DSIB8XOB8 provides 8 safety inputs configured as current sinking input channels.

• How many safety outputs are available on this module?

The module includes 8 safety outputs configured as current sourcing output channels.

• What power supply voltage is required?

The module operates with a 24 VDC field power supply connection.

• Is the module designed for standard digital outputs?

The output channels are safety-rated outputs intended for safety control applications rather than general-purpose output switching.

• Can this module be installed directly on a DeviceNet network?

Yes. The module includes DeviceNet communication capability for distributed I/O network installation.

• What installation consideration applies to safety wiring?

Safety input and output circuits should be wired separately and checked against the approved safety control configuration.

• Does the module support firmware compatibility checks?

Device configuration should be verified against the controller and DeviceNet scanner requirements before system operation.