Purchase now the 2085-OW8, a high-reliability 8-channel relay output expansion module designed for the Micro850 and Micro870 PLC families.
What Is the 2085-OW8?
The 2085-OW8 is a professional-grade digital expansion module that provides 8 independent relay outputs for Allen-Bradley Micro800 controllers. This module serves as a critical interface for switching both AC and DC loads that exceed the capacity of standard solid-state outputs. Designed by Rockwell Automation, it offers robust electromechanical switching, making it suitable for driving motor starters, solenoids, and heavy-duty industrial indicators. Its architecture ensures complete galvanic isolation between the PLC’s sensitive internal logic and the high-voltage field-side circuitry, protecting your automation investment from electrical transients.
Key Technical Specifications
- Output Channels: 8 Relay outputs (normally open)
- Operating Voltage: 5V to 265V AC / 5V to 125V DC
- Continuous Current: 2.0A per point (resistive)
- Inrush Current: 5.0A (max)
- Isolation: 500V AC (field-to-bus)
- Response Time: 10ms (ON/OFF max)
Industrial Compatibility and Architecture
The 2085-OW8 is a compact expansion module that mounts to the right side of a Micro850 or Micro870 controller. It integrates seamlessly through the Connected Components Workbench (CCW) software, allowing for easy logic mapping and diagnostics. This module is particularly effective in hybrid industrial environments where a single PLC must manage different voltage levels, as the 8 relay points are arranged in isolated groups, allowing technicians to mix AC and DC loads on the same module provided they adhere to the group wiring guidelines.
Maintenance Tips
To extend the contact life of the 2085-OW8, always verify that the load does not exceed the 2.0A resistive rating. For inductive loads, such as solenoids or contactors, it is highly recommended to install surge suppression (RC snubbers for AC or flyback diodes for DC) across the load. This prevents contact arcing and pitting, which are the primary causes of relay failure in high-frequency switching applications. Periodically check the Removable Terminal Block (RTB) to ensure connections remain vibration-resistant.
Frequently Asked Questions
Q: Can I use the 2085-OW8 to switch a 230V AC motor directly?
A: While the contacts are rated for 265V AC, you should use the 2085-OW8 to trigger a dedicated motor contactor rather than switching a motor directly, to avoid excessive inrush current damage.
Q: What is the mechanical life expectancy of these relays?
A: The 2085-OW8 is rated for approximately 10 million operations under no-load conditions, though this decreases significantly as the electrical load increases.
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