Purchase now: Allen-Bradley 1762-OB16 MicroLogix Expansion Output Module
Atlantechdrives provides you the 1762-OB16, a robust 16-point digital DC sourcing output module designed specifically for the MicroLogix 1100, 1200, and 1400 controller families. This expansion module is the industry standard for increasing the number of control points in a compact PLC system, allowing for the precise activation of 24V DC field devices such as solenoids, pilot lights, and interposing relays.
- Outputs: 16 Digital DC Sourcing Outputs
- Voltage Category: 24V DC Sourcing
- Operating Voltage Range: 20.4V to 26.4V DC
- Continuous Current per Point: 0.5A @ 55°C
- Bus Current Draw: 175 mA @ 5V DC
Technical Performance: Reliable Sourcing Logic for Industrial Control
The 1762-OB16 is engineered to provide high-speed, solid-state switching for modern automation tasks. As a «Sourcing» module, it provides the positive voltage (+24V DC) to the load, which is the preferred safety standard in many industrial jurisdictions to prevent accidental machine startup in the event of a ground fault. The module features 16 independent channels with opto-isolation, which serves as a protective barrier between the high-voltage field wiring and the sensitive 5V logic of the MicroLogix backplane. This electrical separation is critical for preventing transients and surges from damaging the main processor. Each point includes an amber LED indicator on the front panel, providing immediate visual diagnostic feedback for maintenance personnel during operation.
Expert Tips: Inductive Load and Surge Suppression
When using the 1762-OB16 to drive inductive loads, such as large DC solenoids or contactor coils, it is vital to manage «Flyback» voltage. Although the module has internal protection, we highly recommend installing an external flyback diode (e.g., 1N4004) across the inductive load. This suppresses the high-voltage spike generated when the magnetic field collapses upon turning the output off, significantly extending the life of the output transistors. Furthermore, ensure that the total current draw for the 16 points does not exceed the module’s thermal rating; if many outputs are energized simultaneously in a high-temperature cabinet, it may be necessary to de-rate the current per point or provide forced-air cooling.
Maintenance and Expansion Bus Integrity
The 1762-OB16 communicates via a flat ribbon bus cable that snaps into the adjacent module. During routine maintenance, verify that the bus latch is fully locked and that the cable shows no signs of fraying or heat discoloration. In high-vibration environments, terminal screws should be inspected annually. If the module reports an «I/O Configuration» fault, use RSLogix 500 to check if the module is drawing more current than the MicroLogix power supply can provide. Sourcing authentic 1762-OB16 modules from Atlantechdrives ensures that your expanded I/O system operates with the deterministic timing and reliability required for critical manufacturing processes.
FAQs
Q: Can the 1762-OB16 handle AC loads?
A: No, this is a DC-only module. Switching AC loads will lead to permanent damage of the output FETs.
Q: Is the 1762-OB16 compatible with the MicroLogix 1500?
A: No, the MicroLogix 1500 uses the 1769 series expansion modules. The 1762 series is for ML1100, 1200, and 1400.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This 16-point sourcing DC output module provides reliable field logic for systems based on the 1762-L40BWA controller.
