Product Overview

The Allen-Bradley 1746-OBP16 is a digital DC output module from the SLC 500 family. This module features sixteen sourcing output channels for field device control. Output voltage range spans 20.4 to 26.4 Volts DC. Each channel delivers 1.5 Amperes (or 1.0 Ampere depending on configuration). Total current per module reaches 6.4 Amperes maximum. The 1746-OBP16 occupies a single slot in an SLC 500 chassis. Installation works with either fixed or modular style hardware. Backplane current draw at 5 Volts measures 250 milliamps. An integrated fuse protects the module from short-circuit and overload conditions. The front panel includes an E-FUSE LED that illuminates when a fault occurs. For high-current applications, this module suits demanding output requirements.

Technical Specifications

General Specifications

Output Specifications

Protection & Power Specifications

Sixteen Sourcing Outputs

The 1746-OBP16 provides sixteen sourcing output channels for 24 VDC field devices. Sourcing means the module supplies current to loads from the positive power bus. Each channel operates within a voltage range of 20.4 to 26.4 Volts DC. This range accommodates standard 24 VDC industrial power supplies. Output current per channel reaches 1.5 Amperes (or 1.0 Ampere depending on configuration). For high-current applications, the Allen-Bradley 1746-OBP16 handles demanding loads reliably.

Integrated Fuse Protection

This module features an integrated electronic fuse for short-circuit protection. The fuse safeguards the module from channel short-circuit and overload current. An E-FUSE LED on the front panel illuminates when a fault condition occurs. Other channels continue to operate normally because electronic protection works individually per channel. When an error is detected, the affected channel shuts down. To recover from the fault condition, the system power must be removed. After correcting the actual error, reapply system power. The 1746-OBP16 automatically resets and resumes providing control output. This automatic fault recovery must be considered as part of the system's fail-safe operating conditions.

Fuse Replacement Information

Compatible replacement fuses include Littelfuse #322010 (10A) or #332010 (10A). Using these specific fuses maintains UL/CSA rating for the module. Allen-Bradley offers fuse kit part number 1746-F8 containing five fuses per kit. Fuse replacement requires pulling the module out of the chassis. For maintenance planning, keep spare fuses available. The Allen-Bradley 1746-OBP16 allows field replacement of the fuse component.

Backplane Current Draw

Backplane current draw at 5 Volts measures 250 milliamps. This moderate consumption suits most SLC 500 power supply configurations. Multiple 1746-OBP16 modules can populate a single chassis without overloading the power supply. For large systems, calculate total backplane load before finalizing your configuration. The module's efficiency leaves capacity for other I/O modules.

Wiring Recommendations

Recommended signal wires measure maximum 2 mm² (14 AWG). Use appropriately sized wire for the 1.5 A per channel current rating. For field wiring, follow standard SLC 500 installation practices. Proper wire termination ensures reliable electrical connections. The 1746-OBP16 accepts standard industrial wiring within the specified gauge range.

Installation Guidelines

Follow these steps for proper installation of the 1746-OBP16.

1. Power down the SLC 500 system completely before handling any modules.

2. Select an empty slot in the SLC 500 chassis (fixed or modular style).

3. Align the module with the card guides inside the selected slot.

4. Slide the 1746-OBP16 firmly into place until the backplane connectors engage.

5. Secure the module using the retaining screws at top and bottom.

6. Connect field wiring to the output terminals (max 2 mm² or 14 AWG).

7. Connect external 24 VDC power to the sourcing output commons.

8. Power up the system and verify normal operation without E-FUSE LED illumination.

Note: The 1746-OBP16 features integrated electronic fuse protection per channel. When the E-FUSE LED illuminates, remove system power, correct the fault, then reapply power for automatic reset. Use only Littelfuse #322010 or #332010 fuses for replacement to maintain UL/CSA rating.

Packaging List

• One Allen-Bradley 1746-OBP16 Digital DC Output Module

• One product quick start guide

• One terminal connector set (if applicable)

• One anti-static protective bag

Common FAQs

1. What is the output voltage range of the 1746-OBP16?

Output voltage spans 20.4 to 26.4 Volts DC in sourcing configuration. This range accommodates standard 24 VDC industrial power supplies. Each channel delivers 1.5 Amperes (or 1.0 Ampere depending on configuration). For high-current applications, the Allen-Bradley 1746-OBP16 handles demanding loads within this voltage range.

2. Does the 1746-OBP16 include fuse protection?

Yes, this module features an integrated electronic fuse for short-circuit protection. The fuse protects against channel short-circuit and overload current. An E-FUSE LED on the front panel illuminates during fault conditions. Other channels continue operating because protection is individual per channel. The Allen-Bradley 1746-OBP16 provides robust fault tolerance.

3. How does the 1746-OBP16 recover from a fault condition?

When an error is detected, the affected channel shuts down. To recover, remove SLC 500 system power completely. Correct the actual source of the error first. After correcting the error, reapply system power. The 1746-OBP16 automatically resets and resumes providing control output. This automatic fault recovery must be considered in fail-safe system design.

4. What replacement fuses work with the 1746-OBP16?

Compatible replacement fuses include Littelfuse #322010 (10A) or #332010 (10A). Using these specific fuses maintains UL/CSA rating for the module. Allen-Bradley offers fuse kit part number 1746-F8 (five fuses per kit). Fuse replacement requires pulling the module out of the chassis. The Allen-Bradley 1746-OBP16 allows field replacement of the fuse component.

5. What is the backplane current draw of the 1746-OBP16?

Backplane current draw at 5 Volts measures 250 milliamps. This moderate consumption suits most SLC 500 power supply configurations. Multiple 1746-OBP16 modules can populate a single chassis without overloading. For large systems, calculate total backplane load before finalizing your configuration.

Why Choose This Output Module?

The Allen-Bradley 1746-OBP16 delivers reliable 24 VDC sourcing output for SLC 500 systems. Sixteen channels at 1.5 A per point handle high-current loads effectively. Integrated electronic fuse protection with individual channel shutdown adds robustness. Fast 2.5 ms step response for turn-off suits safety-critical applications. The E-FUSE LED simplifies fault diagnosis and maintenance. For SLC 500 systems requiring high-current DC outputs, choose the 1746-OBP16.