Buy now: Allen-Bradley 1756-OB16E ControlLogix Electronically Fused Output
Atlantechdrives provides you the 1756-OB16E, a 16-point 24V DC sourcing output module designed with integrated electronic protection. The «E» designation stands for Electronically Fused, making this module a preferred choice for protecting both the ControlLogix backplane and your field devices from overcurrent conditions without the need for manual fuse replacements.
- Outputs: 16 Sourcing DC points
- Protection: Internal Electronic Fusing (Per Point)
- Operating Voltage: 10-31.2V DC
- Current Rating: 0.5A per point (8A max per module)
- Status Indicators: Individual I/O LEDs and Fault display
Safety and Protection: The 1756-OB16E Architecture
The 1756-OB16E is engineered for environments where short circuits or overloaded solenoids are a common risk. Unlike standard modules that might sustain internal damage during a fault, the 1756-OB16E detects an overcurrent condition and electronically «trips» the affected point. This trip status is communicated back to the controller, allowing for immediate software-based troubleshooting. Once the fault is cleared, the fuse can be reset through the software or by cycling power, significantly reducing the Mean Time to Repair (MTTR). This makes the OB16E ideal for automotive and food processing applications where high-duty cycle actuators are frequently used.
Installation Advice: Wiring for High-Availability
To maximize the performance of the 1756-OB16E, use a 1756-TBNH or 1756-TBSH Removable Terminal Block (RTB). Ensure your 24V DC field power is clean; high-voltage spikes can occasionally trigger the electronic fuse prematurely. When wiring inductive loads (like large motor contactors), we recommend installing a flyback diode (1N4004 or similar) across the load to suppress back-EMF. Although the module has internal suppression, this external protection extends the life of the output transistors by absorbing the bulk of the energy during de-energization.
Maintenance and Lifecycle Management
The 1756-OB16E is a virtually maintenance-free module. However, regular inspection of the fault LED is recommended. If a point is frequently «tripping,» use a multimeter to check the resistance of the connected solenoid coil; as coils age, their insulation can break down, leading to increased current draw. In Studio 5000, verify the «Electronic Fusing» configuration to ensure the module is set to latch or auto-reset according to your facility’s safety protocols. Keeping the module free of dust and ensuring the chassis fan is operational will prevent thermal stress on the output drivers.
FAQs
Q: Can the 1756-OB16E be used with 5V DC logic?
A: No, this module is specifically designed for 12/24V DC nominal (10-31.2V DC range) applications.
Q: How do I reset a blown electronic fuse?
A: You can reset it through the controller software (Studio 5000) or by cycling the field power to the module.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
To ensure reliable electronically protected switching, this module is technically compatible with any standard 1756-A10 10-slot chassis.
