Allen-Bradley 1791DS-IB12 Safety Input Module Overview

Product Introduction

When machine safety is critical in industrial environments, the Allen-Bradley 1791DS-IB12 provides a reliable solution. This safety input module belongs to the Guard I/O 1791ES and 1791DS series and comes with 12 input channels. It carries the North American Hazardous Location approval rating, making it suitable for demanding settings. The module mounts easily on a DIN Rail using its attachment hook, simplifying installation in control cabinets.

Technical Specifications Breakdown

The 1791DS-IB12 operates with an I/O power supply voltage range from 20.4 Volts DC to 26.4 Volts DC. It consumes 110 mA at 24 Volts DC. The module features 12 single-channel inputs with an on-state input voltage minimum of 11 Volt DC and an off-state input voltage maximum of 5 Volts DC. It has 0 outputs, so it functions purely as an input device. The module also includes 4 current sourcing test outputs for diagnostic purposes. Its input current is 6 mA, with a maximum off-state current of 1 mA. The output has a maximum residual voltage of 1.2 Volts, a rated output current of 0.7 A, and a maximum leakage current of 0.1 mA. The communications power supply voltage ranges from 11 to 25 Volts DC, with a communications current consumption of 110 mA at 24 Volts DC. The module weighs 1.19 lbs (0.54 kg).

Industry Applications

In manufacturing plants, the 1791DS-IB12 monitors safety devices such as emergency stop buttons and light curtains. Its 12 current sinking safety inputs ensure fast detection of unsafe conditions, helping reduce downtime. For example, in a packaging line, the module can connect to multiple safety gates, providing reliable status feedback to the controller. The North American Hazardous Location approval allows use in areas with flammable gases or dust, such as chemical processing facilities.

Installation & Setup Guidance

Mount the 1791DS-IB12 on a standard DIN rail using the integrated attachment hook. Ensure the I/O power supply voltage stays within 20.4 to 26.4 Volts DC. Connect the safety inputs using appropriate wiring for single-channel devices. For test outputs, wire them to the corresponding sensor or actuator as per the system design. Verify all connections before powering up to avoid false trips.

Maintenance & Reliability

From a maintenance engineer's perspective, the 1791DS-IB12 offers straightforward service. Inspect the module periodically for signs of environmental stress, such as dust or moisture. Check the DIN rail attachment for secure mounting. Because the module has no enclosure, ensure the cabinet provides adequate protection. Regular testing of safety inputs and outputs according to the manufacturer's guidelines helps maintain system integrity. The module's low power consumption of 110 mA at 24 Volts DC reduces heat buildup, contributing to long-term reliability.

Compatibility & Integration

The 1791DS-IB12 integrates with Guard I/O 1791ES and 1791DS series systems. It communicates via DeviceNet, as indicated by its CompactBlock DeviceNet designation. This allows seamless connection to Allen-Bradley controllers and safety networks. Verify compatibility with your existing safety PLC or scanner before ordering.

Selection Guide & Purchasing Advice

Before purchasing the 1791DS-IB12, confirm your system's power supply matches the 20.4 to 26.4 Volts DC range. Ensure you have a suitable DIN rail and cabinet space. For complete technical specifications, please contact BluePLC Industrial. BluePLC Industrial is a trusted supplier of industrial automation parts, offering genuine Allen-Bradley modules and expert support.