1746-OVP16 DC Sink Output Module Technical Guide
Product Introduction
The Allen‑Bradley 1746‑OVP16 belongs to the SLC 500 digital I/O family. This module provides 16 discrete DC sinking outputs with 16 points per common. It operates on a 20.4 to 26.4V DC supply voltage. The 1746‑OVP16 consumes 250 mA at 5V DC from the backplane and draws no 24V DC current. Each output supports 1.5A continuously at 30°C and 1.0A at 60°C. The module offers fast switching with a 0.1 ms turn-on delay and 1.0 ms turn-off delay. This performance makes the 1746‑OVP16 ideal for controlling solenoids, relays, and indicator lights in automated systems.
Core Value
The 1746‑OVP16 provides three distinct advantages for control engineers. Firstly, the fused common design protects the entire output bank from overcurrent faults. Moreover, the blown fuse LED indicator speeds up troubleshooting significantly. Secondly, the module delivers high current capacity per point—1.5A continuous—which supports a broad range of actuators directly. Thirdly, the fast turn-off feature suppresses inductive load spikes effectively, reducing the need for external suppression components. These capabilities translate to reduced downtime and simpler panel designs.
Technical Insights
Understanding the 1746‑OVP16’s protection scheme is critical for reliable system design. The onboard fuse safeguards the common circuit but does not provide per-channel overload protection. Therefore, we recommend installing external, user-supplied fuses sized to match your specific load characteristics. Furthermore, the module includes internal flyback diodes for inductive loads. However, if another contact connects in series with the load, install a 1N4004 diode reverse-wired across the load. Specifically, observe the output voltage drop: typical values measure 0.2V at 1.0A and 0.5V at 1.5A. Also, the OFF-state leakage current stays below 1.0 mA at 60°C. These parameters ensure stable performance across temperature variations.
Installation & Maintenance
Proper installation of the 1746‑OVP16 follows standard SLC 500 chassis practices. Firstly, insert the module into any available slot in the 1746 chassis. Then, tighten the captive screws to secure the module firmly. Moreover, connect the field wiring to the removable terminal block before insertion. This approach simplifies replacement and reduces wiring errors. For maintenance, inspect the fuse condition regularly. The front-panel LED illuminates when the fuse blows, giving you a clear visual alert. Besides that, verify the output LED status during operation to confirm proper switching. We also suggest cleaning the module face with dry compressed air every six months to prevent dust buildup.
Buyer’s Guide FAQ
1. What output type does the Allen‑Bradley 1746‑OVP16 provide?
The 1746‑OVP16 provides 16 DC sinking outputs. This means the output connects the load to the DC common when turned on.
2. What is the maximum current per output point on the 1746‑OVP16?
Each output supports 1.5A continuously at 30°C and 1.0A at 60°C. Always derate current for higher ambient temperatures.
3. Does the 1746‑OVP16 include per‑channel fusing?
No, the module uses a single common fuse for all 16 outputs. We recommend adding external fuses per channel for individual protection.
4. How do I know if the fuse on the 1746‑OVP16 has failed?
The module has a dedicated blown fuse indicator LED on the front panel. This light turns on when the common fuse opens.
5. Can the 1746‑OVP16 drive inductive loads directly?
Yes, the module includes internal suppression diodes. For heavily inductive loads, install an additional suppression diode externally for better reliability.
