Introduction to the Allen-Bradley 1762-OB16
When your MicroLogix controller runs out of built-in outputs, production lines stall and upgrade projects get delayed. The Allen-Bradley 1762-OB16 solves this by adding sixteen 24VDC sourcing output channels in a compact expansion module. As part of the MicroLogix 1200 series, it connects directly to MicroLogix 1100, 1200, and 1400 controllers, giving you the extra I/O you need without replacing your existing system.
This solid-state output module is designed for discrete actuating devices such as solenoids, pilot lamps, relays, and motor starters. With a 0.1 ms turn-on delay and 1.0 ms turn-off delay, it responds quickly to control signals, keeping your processes precise and efficient.
Key Technical Specifications That Drive Performance
The 1762-OB16 operates on a 24VDC voltage category with an output voltage range of 20.4–26.4VDC. This wide range accommodates typical industrial power fluctuations, ensuring reliable switching even when supply voltage varies.
Each of the sixteen outputs is sourcing (PNP) type, grouped into a single group covering outputs 0 through 15. The module draws a maximum of 175 mA at 5VDC from the backplane, translating to 0.88W of bus power. This low draw means you can add multiple modules without overloading your controller’s power supply.
Current ratings are robust: each point handles 0.5A continuously at 55°C (131°F) or 1.0A at 30°C (86°F). The entire module supports 4.0A continuous at 55°C or 8.0A at 30°C. A maximum surge current of 2.0A is allowed for 10 ms, with repeatability of once every 2 seconds at 55°C or once per second at 30°C. These ratings let you drive a mix of loads without external interposing relays in many cases.
Where the 1762-OB16 Fits in Your Operation
Packaging Line Expansion
A MicroLogix 1400 controlling a carton sealer needs more outputs for new indicator lamps and diverter solenoids. The 1762-OB16 adds 16 sourcing outputs, and its fast 0.1 ms ON delay ensures the diverter actuates precisely in sync with conveyor speed. You can install up to seven of these modules with a MicroLogix 1400, giving ample room for growth.
Material Handling Retrofit
An existing MicroLogix 1200 system runs a sorting conveyor with limited outputs. By adding a 1762-OB16, you gain control for additional pneumatic actuators and warning buzzers. The module’s 20.4–26.4VDC range tolerates voltage sag during peak loads, maintaining reliable operation. Up to six modules can be installed with a MicroLogix 1200.
Small Machine Build
For a compact labeling machine using a MicroLogix 1100, the 1762-OB16 provides 16 outputs in a DIN rail mount package. The 0.1 ms response time handles high-speed label applicators, and the module’s low 175 mA bus draw preserves power budget for other expansions. Up to four modules are supported with a MicroLogix 1100.
Installation and Setup Essentials
Mount the 1762-OB16 on a DIN rail or panel. For high-vibration environments, use a DIN rail end anchor. Ensure the mounting surface is well-grounded and maintain 2 inches (50.8 mm) of clearance on all sides for ventilation. The module has a power supply distance rating of six modules; do not install it more than six modules away from the power supply without adding another supply.
Wiring follows sourcing configuration: connect the positive supply to the output terminals and the load between the output and DC common. Always follow local electrical codes and the manufacturer’s installation instructions.
Maintenance and Reliability
Inspect the module periodically for loose connections, dust accumulation, and signs of overheating. Clean with a dry, soft brush or low-pressure air if needed. The solid-state design has no moving parts, minimizing wear. Operate within 5–95% non-condensing humidity and at altitudes up to 2000 meters (6561 feet). Following these guidelines ensures long service life and protects your investment.
Compatibility and Integration
The 1762-OB16 works seamlessly with MicroLogix 1100, 1200, and 1400 controllers. It communicates via the backplane, so no additional configuration is required beyond addressing. Use it alongside other 1762 series I/O modules to build a tailored control system. For replacement or upgrade projects, verify that your controller firmware supports the module count you plan to install.
Selection Guide
Before purchasing, confirm your controller model and the number of expansion modules already installed. Check that your power supply can handle the additional 175 mA bus current draw per module. If you need sourcing outputs, the 1762-OB16 is the correct choice. For sinking outputs, look for a different module. SpareTechPLC stocks the 1762-OB16 and can help you verify compatibility.
Frequently Asked Questions
1. Can I use the 1762-OB16 with a MicroLogix 1100?
Yes, it is compatible. You can install up to four 1762-OB16 modules with a MicroLogix 1100 controller.
2. What is the maximum current per output point?
Each point handles 0.5A continuously at 55°C (131°F) or 1.0A at 30°C (86°F).
3. How many 1762-OB16 modules can I add to a MicroLogix 1400?
You can install up to seven modules with a MicroLogix 1400, subject to power supply capacity.
4. Is the 1762-OB16 a sourcing or sinking module?
It is a sourcing (PNP) output module, providing positive voltage to the load.
5. What is the signal delay time?
The turn-on delay is 0.1 ms and the turn-off delay is 1.0 ms.
