Buy now: Allen-Bradley 1756-OV16E ControlLogix Sinking Output Module
Atlantechdrives provides you the 1756-OV16E, a 16-point discrete DC sinking output module featuring integrated electronic fusing. Designed for the ControlLogix platform, this module is specifically engineered for applications requiring a sinking (NPN) configuration, providing a path to ground for field-side loads while offering advanced protection against overcurrent and short-circuit conditions.
- Outputs: 16 Sinking DC points (NPN)
- Protection: Internal Electronic Fusing (Per Point)
- Voltage Range: 10-31.2V DC
- Current Rating: 0.5A per point @ 60°C
- Status Indicators: Individual I/O LEDs and Module Fault LED
Technical Performance: Sinking Logic and Electronic Protection
The 1756-OV16E is the ideal solution for systems where field devices are already wired to a common positive rail. By providing a low-side (ground) switch, the 1756-OV16E allows for precise control of solenoids, pilot lights, and relay coils. The «E» designation is critical: each of the 16 outputs is monitored by an electronic fuse. If a short circuit occurs at the field device, the module will trip the affected point in microseconds, protecting the internal transistors and the backplane. This fault data is immediately reported to the Logix processor, enabling faster diagnostics and reducing the Mean Time to Repair (MTTR) compared to systems using traditional glass fuses.
Expert Tips: Inductive Load Management
When using the 1756-OV16E to drive inductive loads such as large DC contactors, back-EMF is your primary concern. Although the module includes internal suppression, we recommend installing an external flyback diode (like a 1N4004) directly across the coil of the load. This is especially important for sinking modules, as the transient voltage can stress the output transistors during de-energization. In the software configuration within Studio 5000, ensure you set the «Fusing» behavior to either latch or auto-reset based on your facility’s safety protocols. Auto-reset is convenient but may hide intermittent wiring faults that could eventually lead to hardware failure.
Maintenance and Hardware Reliability
The 1756-OV16E is a virtually maintenance-free solid-state module. However, regular inspection of the fault logs in the controller is highly recommended. If a specific point is frequently tripping its electronic fuse, it is a clear indicator of a failing solenoid or moisture in the field conduit. Ensure the 1756-TBNH terminal block is securely fastened; industrial vibration can loosen screw terminals, leading to arcing and localized heat that could trigger a thermal trip on the module. Keeping the front panel clear of dust ensures that the individual status LEDs remain visible, allowing maintenance teams to verify the state of each NPN output at a glance.
FAQs
Q: What is the difference between Sourcing and Sinking?
A: Sourcing (OB) provides the positive leg of the circuit, while Sinking (OV) provides the path to ground.
Q: How do I reset a tripped point on the 1756-OV16E?
A: You can reset the electronic fuse through the Studio 5000 software or by cycling field power to the module.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This 16-point sinking DC output module with electronic protection integrates seamlessly with 1756-IB16D diagnostic input cards.
