Introduction to the Allen-Bradley 1746-OB16
When a critical SLC500 control system fails, every minute of downtime costs money. The Allen-Bradley 1746-OB16 is a discrete DC output module engineered to keep your automation running with sixteen high-current output channels. As part of the trusted SLC500 series from Rockwell Automation, this module delivers dependable 24VDC output for demanding industrial environments. Whether you are replacing a failed unit or expanding an existing system, the 1746-OB16 offers the robust performance that plant engineers rely on.
Technical Specifications That Matter
The 1746-OB16 provides sixteen outputs in a single group, each capable of handling continuous current up to 1.5 A at 30 °C and 1.0 A at 55 °C. The module operates on a 10-30VDC range, with a source voltage range of 10-50VDC, making it versatile for various DC control circuits. Fast response times of 1.0 ms OFF to ON and 0.1 ms ON to OFF ensure precise timing for high-speed applications. With a backplane current draw of 0.135 A at 5.1 Volts and heat dissipation of 7.6 Watts, it integrates efficiently into your panel. The OFF-state leakage current of 1 mA minimizes false signals, while the maximum continuous current per module reaches 6.4 A across 0…60 °C.
Performance Comparison: 1746-OB16 vs. Similar Modules
When selecting a DC output module, engineers often compare the 1746-OB16 to other SLC500 options. Here is how it stands out:
- Channel Count: 16 outputs in one group, versus 8 or 32-channel alternatives.
- Current per Point: 1.5 A at 30 °C, higher than many standard modules.
- Switching Speed: 1.0 ms OFF to ON and 0.1 ms ON to OFF, faster than typical relay outputs.
- Voltage Range: 10-30VDC operating, 10-50VDC source, accommodating diverse DC supplies.
This comparison highlights the 1746-OB16 as a high-current, fast-switching solution for applications where standard modules fall short.
Industry Applications
The 1746-OB16 excels in high-current switching scenarios. In automotive assembly lines, it drives solenoid valves and indicator lamps with reliable 24VDC output. For packaging machinery, the fast response times ensure precise actuation of diverters and grippers. Material handling systems benefit from the module’s ability to control motor starters and relays, even in high-vibration environments. Its robust design and 6.4 A module capacity make it a go-to choice for demanding industrial automation tasks.
Installation and Setup
Installing the 1746-OB16 is straightforward for experienced technicians. It mounts directly into any SLC500 chassis, occupying a single slot. Ensure the backplane power supply can provide the required 0.135 A at 5.1 Volts. Wire outputs according to your field device requirements, observing the 10-30VDC operating range. Use proper grounding and separation from AC wiring to minimize noise. Always follow local electrical codes and the manufacturer’s installation guide.
Maintenance and Reliability
To maximize the lifespan of your 1746-OB16, schedule regular inspections. Check for loose connections, excessive heat, and dust accumulation. The module’s 7.6 Watt heat dissipation means adequate panel ventilation is essential. In high-temperature environments, derate the continuous current per point as specified (1.0 A at 55 °C). While the module is solid-state with no moving parts, periodic testing of output channels ensures continued reliability. Keep spare units on hand to minimize downtime.
Compatibility and Integration
The 1746-OB16 integrates seamlessly with Allen-Bradley SLC500 processors, including the 1747 series. It communicates via the backplane, requiring no additional configuration for basic operation. For advanced control, program the outputs using RSLogix 500 software. The module is compatible with a wide range of DC loads, from relays to small motors, making it a flexible addition to your control system.
Selection Guide
Before purchasing a 1746-OB16, verify your system’s voltage and current requirements. Ensure your chassis has an available slot and sufficient backplane power. Consider the ambient temperature for derating. SpareTechPLC offers this module and other SLC500 components to keep your operations running. Contact us for availability and bulk pricing.
Frequently Asked Questions
What is the output voltage of the 1746-OB16?
The module provides a 24VDC output with an operating voltage range of 10-30VDC.
How many outputs does the 1746-OB16 have?
It features sixteen (16) outputs in one group.
What is the maximum continuous current per point?
The module handles 1.5 A at 30 °C and 1.0 A at 55 °C per point.
Is the 1746-OB16 compatible with all SLC500 processors?
Yes, it works with SLC500 series processors and mounts in any compatible chassis.
What is the heat dissipation of this module?
It dissipates 7.6 Watts, so ensure proper panel ventilation.
