1746-OB16 | Allen-Bradley SLC500 Digital DC Output Module Supplier

Product Overview

As industrial automation evolves, the demand for reliable, high-current discrete output modules grows. The Allen-Bradley 1746-OB16 meets this need as a Digital DC Output Module within the SLC500 series. Manufactured by Rockwell Automation, this module provides sixteen (16) DC output channels in one (1) group, operating at 24VDC with an output voltage range of 10-30VDC. Engineers seeking a robust solution for controlling actuators, solenoids, and other DC loads will find the 1746-OB16 a dependable choice.

Key Features & Technical Specs

• The 1746-OB16 features sixteen (16) discrete DC outputs, supporting high-current applications with continuous current per point of 1.5 A at 30 °C (86 °F) and 1.0 A at 55 °C (131 °F).
• Maximum continuous current per module is 6.4 A across 0 to 60 °C (32 to 140 °F), ensuring stable performance under varying thermal conditions.
• Output delay times are 1.0 ms (OFF to ON) and 0.1 ms (ON to OFF), enabling fast response in control loops.
• Off-state leakage current is limited to 1 mA, reducing false triggering in sensitive circuits.
• Backplane current draw is 0.135 A at 5.1 Volts, and heat dissipation is 7.6 Watts, allowing efficient integration into SLC500 racks.
• Operating voltage range spans 10-30VDC, with a source voltage range of 10-50 Volts DC, offering flexibility in power supply design.

Real-World Applications

In manufacturing lines, the 1746-OB16 excels at driving high-current DC loads such as motor starters, valves, and indicator lights. For example, in a packaging facility, this module can control multiple solenoid valves simultaneously, thanks to its 16-point configuration and 1.5 A per point capacity. Its fast output delays (1.0 ms ON, 0.1 ms OFF) make it suitable for applications requiring precise timing, such as conveyor sorting systems. Additionally, the module's high-current rating reduces the need for external relays, simplifying panel design and lowering total system cost.

Installation Guide

Mount the 1746-OB16 into any available slot in an SLC500 chassis, ensuring proper backplane connection. The module is keyed to prevent incorrect insertion. Connect DC power within the 10-30VDC range to the output terminals, observing polarity. For optimal performance, use twisted-pair wiring for output circuits to minimize electromagnetic interference. Refer to the SLC500 installation manual for detailed slot numbering and grounding guidelines.

Maintenance & Reliability

To maximize uptime, inspect the 1746-OB16 module periodically for dust accumulation and ensure adequate airflow around the chassis. The module's heat dissipation of 7.6 Watts requires proper ventilation to maintain operating temperatures within 0 to 60 °C. Verify that output connections remain tight and free of corrosion. Routine checks of the backplane current (0.135 A at 5.1 V) can help identify early signs of power supply issues. Following these practices extends module life and reduces unexpected downtime.

Compatibility & Integration

The 1746-OB16 integrates seamlessly with SLC500 processors and other 1746-series I/O modules. It communicates via the SLC500 backplane, requiring no additional configuration for basic operation. The module is compatible with Allen-Bradley programming software such as RSLogix 500, allowing straightforward setup of output channels. For systems requiring higher current per module, consider the 1746-OB16's 6.4 A maximum continuous current rating, which supports up to 16 loads simultaneously.

Common Questions

Q: What is the output voltage of the 1746-OB16?

A: The module provides a 24VDC output with an operating voltage range of 10-30VDC.

Q: How many outputs does the 1746-OB16 have?

A: It features sixteen (16) discrete DC outputs in one group.

Q: What is the maximum current per point?

A: Continuous current per point is 1.5 A at 30 °C (86 °F) and 1.0 A at 55 °C (131 °F).

Q: What is the off-state leakage current?

A: The off-state leakage current is 1 mA.

Q: Can the 1746-OB16 be used in high-temperature environments?

A: Yes, it operates from 0 to 60 °C (32 to 140 °F) with derated current at higher temperatures.

Product Support & Availability

The Allen-Bradley 1746-OB16 is in stock and ready to ship from Petro Auto Tech. Contact our team for pricing and lead time. For technical documentation, refer to the official Rockwell Automation datasheet or reach out to Petro Auto Tech's support staff.