Purchase now: Allen Bradley 1746-OV16 DC Output Module
Purchase now: Atlantechdrives provides you the 1746-OV16, a premium 16-channel digital DC output module engineered by Allen Bradley for the highly reliable SLC 500 programmable logic controller system. Unlike standard sourcing modules, the 1746-OV16 operates on a strict Sinking electrical configuration. This means the module switches the negative side of the circuit, providing a path to ground (DC Common) for the connected field devices. It is an indispensable hardware component for industrial facilities, material handling systems, and automated assembly lines that standardize on sinking logic to actuate 24V DC loads such as relays, pilot lights, pneumatic solenoids, and solid-state motor starters.
Technical Specifications of the 1746-OV16
The 1746-OV16 utilizes high-speed solid-state transistor technology, offering millions of wear-free switching cycles and lightning-fast response times. The module provides excellent optical isolation, shielding the internal 5V DC backplane of the processor from external electrical noise and voltage transients.
- Part Number: 1746-OV16
- Module Type: Digital DC Output Module
- Compatible System: Allen Bradley SLC 500 (1746 Chassis)
- Number of Outputs: 16 Solid-State Sinking points
- Operating Voltage: 10…50V DC
- Wiring Logic: Sinking (Provides DC Common / Ground to load)
- Continuous Current per Point: 0.50 Amps at 30°C / 0.25 Amps at 60°C
- Signal Delay: On: 0.1 ms, Off: 1.0 ms
- Backplane Current Draw: 270 mA at 5V DC
Expert Installation Advice: Sinking vs. Sourcing Wiring
Misunderstanding sinking logic is the number one cause of installation delays. Expert Tip: Because the 1746-OV16 is a «Sinking» module, you must wire your field devices differently than you would with a standard «Sourcing» (OB16) module. You must connect the positive leg (+24V DC) of your power supply directly to one side of your load (e.g., the solenoid coil). The other side of the load connects to the output terminal on the 1746-OV16. When the PLC commands the output to turn ON, the module closes the circuit to ground (DC Common), allowing current to flow and energizing the device. If you wire positive voltage directly into the module’s output terminals, it will not function and you risk damaging the internal transistors.
Maintenance and Overcurrent Protection
The 1746-OV16 does not have built-in electronic short-circuit protection or internal replaceable fuses. If a solenoid crushes a cable on the factory floor and shorts the positive voltage directly to the module’s ground path, the corresponding solid-state transistor will blow instantly. To ensure the longevity of this module, it is highly recommended to install externally fused terminal blocks (e.g., 0.5A fast-blow fuses) between the module and the field devices. Regularly inspect the Removable Terminal Block (RTB) to ensure the VDC and COM power connections are tight and free of oxidation.
Frequently Asked Questions (FAQs)
Q: What is the main difference between the 1746-OV16 and the 1746-OB16?
A: The 1746-OB16 is a Sourcing module (it supplies +24V DC to the load). The 1746-OV16 is a Sinking module (it supplies the path to Ground/0V to the load). You must select the module that matches the wiring standard of your specific machine.
Q: Can I drive an AC load with this module?
A: No. The 1746-OV16 is strictly for DC voltage loads (10 to 50V DC). Using alternating current will destroy the solid-state components.
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This sinking DC output card is designed to work in conjunction with the 1746-IV16 sourcing input module.
