Purchase 1769-OV32T now for efficient sinking output control
The Allen-Bradley 1769-OV32T is a high-density, 32-point solid-state digital output module engineered for the CompactLogix programmable logic controller ecosystem. Unlike its sourcing counterparts, the 1769-OV32T operates on 24V DC sinking logic. This means the module switches the negative connection (DC Common) to the load, while the load is permanently supplied with positive voltage. This configuration is widely utilized in specific global markets and is exceptionally well-suited for interfacing with NPN-type field devices, specialized instrumentation, and custom printed circuit boards integrated into larger automated lines.
Technical Specifications
- Output Channels: 32 Solid-State Sinking Outputs.
- Operating Voltage: 20.4 to 26.4V DC (Nominal 24V DC).
- Current Rating: 0.5 Amps per point.
- Maximum Module Current: 4.0 Amps total per module.
- Surge Current: 2.0 Amps for 10 milliseconds.
- Backplane Current Draw: 300 mA at 5V DC.
Comprehensive Technical Overview
The 1769-OV32T offers the same exceptional spatial efficiency as the OB32, doubling the output capacity of a single CompactLogix slot. The crucial difference lies in its sinking architecture. By switching the ground path, this module is perfectly aligned with machine designs that standardize on negative logic (NPN). This is particularly common in semiconductor manufacturing equipment, robotics platforms, and complex material handling systems. The solid-state design ensures rapid switching speeds with no mechanical wear, providing millions of cycles of reliable operation. Furthermore, the front panel features status LEDs for all 32 channels, allowing maintenance personnel to instantly diagnose output states without measuring individual terminals with a multimeter.
Expert Installation Advice
When integrating the 1769-OV32T into your control panel, absolute clarity in your wiring schematics is essential. Mixing sinking and sourcing logic on the same machine without clear documentation can lead to severe troubleshooting difficulties. Ensure that the positive 24V DC supply is securely routed to one side of all your loads (relays, solenoids), and the negative return path is routed through the 1769-OV32T module. Because this is a high-density module, we highly recommend utilizing Allen-Bradley’s pre-wired interface modules (IFMs) to prevent wiring congestion and minimize the risk of stray wire strands causing shorts across adjacent terminals.
Maintenance Protocols
Solid-state sinking modules are highly reliable but can be sensitive to voltage spikes on the ground plane. Ensure that your entire machine has a robust, low-impedance grounding system. Regularly inspect the 24V DC power supplies connected to the loads to ensure they are providing clean, ripple-free power, as fluctuations can affect the solid-state switching performance of the module.
Frequently Asked Questions (FAQs)
Q: What is the main difference between the 1769-OB32 and the 1769-OV32T?
A: The 1769-OB32 is a sourcing module (switches positive voltage), while the 1769-OV32T is a sinking module (switches the negative/common path).
Q: Can I use this module to control AC loads?
A: No, the 1769-OV32T is strictly designed for 24V DC loads. For AC loads, you must use an AC-rated output module or use this module to drive a 24V DC relay that in turn switches the AC load.
Q: What is the power supply distance rating for this module?
A: Like other high-density modules in this family, it must be installed within 8 slots of the CompactLogix system power supply.
Series Continuity
If your specific environmental conditions require a ruggedized sourcing module instead, we highly recommend looking at the conformally coated 1769-OB16K.
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