Configured for safety input monitoring and test output control in DeviceNet Safety CompactBlock networks, the Allen-Bradley 1791DS-IB12 (1791DSIB12 Guard I/O Digital Combination Module) provides direct physical and electrical execution for distributed safety I/O signal processing.

Model Identification

The 1791DS-IB12 is a Guard I/O module containing 12 digital safety inputs and 4 test outputs. It is designed for connection within Allen-Bradley DeviceNet Safety architectures where field devices require monitored input acquisition and safety-rated output testing functions.

The module operates from a 24 VDC supply and communicates through the DeviceNet Safety network interface. It supports single-channel input configurations with defined on-state and off-state voltage thresholds.

Hardware Specifications

EtherNet/IP and PLC I/O Integration Characteristics

As part of the Allen-Bradley industrial control platform family, the 1791DS-IB12 follows structured I/O density scaling concepts used in distributed automation systems. The module provides compact field-level signal collection by combining multiple safety inputs and test outputs in a single hardware node.

DeviceNet Safety communication allows the module status and safety I/O data to be exchanged with compatible safety controllers. Proper network configuration requires matching node addressing, safety parameters, and controller firmware compatibility.

Ordering Information

The standard package contents include:

• 1 x Allen-Bradley 1791DS-IB12 Guard I/O Digital Combination Module
• 1 x Product identification label
• 1 x Hardware unit with integrated terminal connection interface

Additional components may be required depending on installation requirements:

• DeviceNet Safety communication cable
• 24 VDC field power wiring
• Compatible safety controller or scanner module
• Field device terminal accessories

Installation Requirements

• Install the module inside an enclosure suitable for industrial electrical equipment.
• Verify the 24 VDC supply polarity before applying power.
• Separate safety signal wiring from high-voltage power cables to reduce electrical interference.
• Connect cable shields according to the grounding method specified for the control system.
• Confirm DeviceNet Safety node configuration before placing the module into operation.
• Check field input devices for correct voltage levels matching the module input thresholds.

Frequently Asked Questions

• What is the main function of the 1791DS-IB12 module?

  The module collects 12 digital safety input signals and provides 4 test outputs for DeviceNet Safety CompactBlock applications.

• What supply voltage does the 1791DS-IB12 require?

  The module operates from a 24 VDC supply with an allowable operating range of 20.4 to 26.4 VDC.

• How many safety inputs are available on this module?

  The 1791DS-IB12 provides 12 single-channel digital safety inputs for connected field devices.

• What type of network does this module use?

  The module is designed for DeviceNet Safety communication within compatible Allen-Bradley safety control systems.

• Does the module include test outputs?

  Yes. The unit provides 4 test outputs used for safety input device monitoring functions.

• What is the operating temperature range?

  The specified operating temperature range is -10 to +50 deg C for normal installation conditions.

• Can the input voltage thresholds be configured by firmware?

  The module uses defined electrical input thresholds. Configuration depends on the connected safety controller and system parameters.

• Is hot swapping supported for this module?

  Hot swapping capability is not specified in the provided technical data. Power removal before replacement is recommended.