Allen-Bradley 1746-OBP16 DC Output Module SLC 500

1746-OBP16 16-Channel Sourcing Output Module

Product Introduction

The 1746-OBP16 from Allen-Bradley offers sixteen high-current DC sourcing outputs in a single-slot SLC 500 package. This output module operates within a 20.4-26.4V DC range, making it ideal for 24V DC control systems. Each channel delivers up to 1.5A at 30°C or 1A at 60°C, with a total module current of 6.4A. A key differentiator is the integrated electronic fuse per channel, which protects against short circuits and overload conditions without shutting down the entire module. Furthermore, the front-panel E-FUSE LED provides clear visual fault indication, simplifying diagnostics and maintenance.

Key Technical Specifications

The 1746-OBP16 features sixteen output points with individual electronic protection. Each channel supports 1.5A at 30°C and 1A at 60°C, with a total module current of 6.4A. The backplane draws 250mA at 5V DC, ensuring efficient power consumption within the SLC 500 chassis. Step response times measure 60ms for turn-on and 2.5ms for turn-off, enabling precise control in time-critical applications. Additionally, the minimum load current is 1mA, ensuring compatibility with a wide range of field devices.

This output module includes a replaceable fuse component to maintain UL and CSA ratings. Compatible replacement fuses are Littelfuse #322010 (10A) or #332010 (10A). Allen-Bradley offers the 1746-F8 fuse kit, which contains five fuses per package. For fuse replacement, you must remove the module from the chassis—a straightforward procedure detailed in the user manual.

Electronic Fuse and Fault Recovery

A standout feature of the 1746-OBP16 is its per-channel electronic fuse protection. When a short circuit or overload occurs on any output, the module detects the fault and shuts down only that specific channel. Other channels continue operating normally, minimizing production interruptions. The E-FUSE LED on the front panel illuminates to indicate the fault condition, providing immediate visual feedback.

To recover a faulted channel, you must first correct the root cause—such as removing the short circuit or reducing the load. Next, power down the entire SLC 500 system and then reapply power. The 1746-OBP16 automatically resets and resumes normal output operation. Importantly, this automatic recovery behavior should be considered during system fail-safe design to prevent unexpected machine starts.

Environmental and Mechanical Ratings

Operating temperature for the 1746-OBP16 ranges from 0°C to 60°C, while storage permits -40°C to 85°C. Humidity tolerance spans 5% to 95% non-condensing, accommodating harsh factory environments. This output module holds UL listing, CE compliance, and CSA certification, confirming adherence to international safety standards. Electro-optical insulation between I/O terminals and logic circuitry is rated at 1500V, providing robust isolation against external electrical faults.

Installation and Configuration

Installing the 1746-OBP16 is simple and tool-free. Slide the module into any available slot within an SLC 500 fixed or modular chassis. The backplane automatically supplies 5V DC power, requiring no external logic supply. Field wiring connects via the front-facing terminal block, with each output point clearly labeled for easy identification. Configuration occurs through your programming software, where you map the outputs to your control logic. For optimal performance, mount this module away from high-heat sources and ensure adequate airflow around the chassis.

Typical Applications

This output module excels in high-density 24V DC control applications. For instance, it drives solenoid valves, motor starters, indicator lamps, and relay coils in packaging lines, assembly stations, and material handling systems. Its individual channel protection makes it particularly valuable in applications where a single short circuit should not halt the entire process. Additionally, the 1746-OBP16 suits retrofit projects upgrading older SLC 500 systems with enhanced protection features.

Packaging List

• 1 x Allen-Bradley 1746-OBP16 output module

• 1 x Removable terminal block (installed)

• 1 x Slot filler label

• 1 x Quick-start guide (printed)

Note: The 1746-F8 fuse kit, cables, and programming software are sold separately.

Shipping Information

All orders ship via FedEx, UPS, or DHL with full tracking and insurance coverage. Expedited shipping options are available upon request. Domestic deliveries typically arrive within 2–3 business days, while international shipments take 5–7 days depending on customs clearance.

Frequently Asked Questions (FAQ)

Q1: What is the difference between the 1746-OBP16 and the 1746-OB16?
The 1746-OBP16 includes per-channel electronic fuse protection and individual fault LEDs, whereas the standard 1746-OB16 lacks integrated fusing. Choose the OBP16 for enhanced short-circuit protection and diagnostics.

Q2: How do I replace a blown fuse on the 1746-OBP16?
First, remove the module from the SLC 500 chassis. Then, locate the fuse holder on the circuit board and replace the fuse with a Littelfuse #322010 or #332010 (10A). Allen-Bradley's 1746-F8 kit provides five replacement fuses. Reinstall the module and reapply power.

Q3: What happens if one channel short-circuits?
The electronic fuse isolates only the affected channel, shutting it down while the other fifteen outputs continue operating. The E-FUSE LED illuminates to indicate the fault. After correcting the issue, cycle system power to reset the module.

Q4: Can the 1746-OBP16 drive inductive loads directly?
Yes, but external flyback diodes are strongly recommended across inductive loads (such as relays or solenoids) to protect the output transistors from voltage spikes. This practice extends module lifespan and reduces electrical noise.

Q5: Is the 1746-OBP16 compatible with fixed SLC 500 systems?
Yes. This output module works with both fixed and modular SLC 500 hardware styles, provided the chassis has an available slot and sufficient backplane power (250mA at 5V DC).