1746-OB16E | Allen-Bradley Digital DC Output Module Supplier

Introduction to the 1746-OB16E Digital DC Output Module

When your SLC 500 system demands robust, electronically fused DC output control, the 1746-OB16E from Allen-Bradley provides a dependable solution. This module is engineered for high-current applications, offering 16 source outputs within a 10-30 Volts DC range. Designed by Rockwell Automation, the 1746-OB16E integrates seamlessly into any available slot in a 1746 chassis, using a Removable Terminal Block (RTB) for straightforward wiring.

Key Features & Technical Specs

• Voltage Range: 10-30 Volts DC Source.
• Outputs: 16 individual digital DC outputs.
• Current per Output: 1 or 0.5 amps, depending on load requirements.
• Current per Module: 8 amps total; 9 amps at 30°C.
• Backplane Current: 135 milliamps at 5 Volts.
• Step Response: 60 milliseconds on, 2.5 milliseconds off.
• Heat Dissipation: 0.388W per output point, 7.6W total module dissipation.
• Operating Temperature: 0-60°C (32-140°F) with 5-95% non-condensing humidity.
• Vibration & Shock: 2.5G at 10-200Hz; 30G shock rating.

A distinctive feature of the 1746-OB16E is its electronic fusing, which protects against overcurrent conditions without requiring replacement fuses. This reduces downtime and maintenance costs in high-current applications.

Applications & Use Cases

Because the 1746-OB16E is rated for high current, it is ideal for controlling solenoids, motor starters, and other inductive loads in industrial automation. For example, in a packaging line, this module can reliably switch multiple actuators simultaneously. Its fast 1ms signal delay (load-dependent) ensures precise timing for synchronized operations. Additionally, the module’s NEMA ICS 2-230 noise immunity rating makes it suitable for electrically noisy environments.

Installation & Setup

To install the 1746-OB16E, first ensure the SLC 500 chassis power is off. Insert the module into any available slot and secure it with the retaining screws. Connect field wiring to the Removable Terminal Block (RTB) using the correct torque specifications from the manual. For source outputs, the common must be connected to the DC supply negative. Always verify that the total module current does not exceed 8 amps (or 9 amps at 30°C) to avoid thermal overload.

Maintenance & Reliability

Routine inspection of the 1746-OB16E should focus on verifying that the RTB connections remain tight and free of corrosion. Because the module uses electronic fusing, there are no mechanical contacts to wear out. Operate the module within its specified temperature range (0-60°C) and humidity limits (5-95% non-condensing) to maximize service life. Periodically check the backplane current draw to ensure it remains at 135 milliamps at 5 Volts.

Compatibility & Integration

The 1746-OB16E is part of the Allen-Bradley SLC 500 family and is compatible with all 1746 chassis. It works with any SLC 500 processor that supports digital output modules. The module uses a standard Removable Terminal Block (RTB) for field wiring, simplifying integration into existing control panels. For detailed compatibility information, refer to the SLC 500 installation manual.

FAQs about the 1746-OB16E

Q: What is the maximum current per output on the 1746-OB16E?

A: The maximum current per output is 1 amp or 0.5 amps, depending on the load and ambient temperature.

Q: Does the 1746-OB16E require a separate power supply?

A: No, it draws 135 milliamps at 5 Volts from the backplane. The output power comes from the external 10-30V DC source connected to the module.

Q: What is the step response time of this module?

A: The step response is 60 milliseconds for the on state and 2.5 milliseconds for the off state.

Q: Can the 1746-OB16E be used in high-vibration environments?

A: Yes, it is rated for 2.5G vibration at 10-200Hz and 30G shock, making it suitable for many industrial settings.

Q: How do I know if the module is overloaded?

A: The electronic fusing will protect the module, but you should monitor the total module current to stay below 8 amps (9 amps at 30°C).

Product Support & Availability

The 1746-OB16E is available from Petro Auto Tech. Please verify current lifecycle status and availability with Petro Auto Tech before ordering. In stock and ready to ship for most orders.