Get now the 2080-OW4I, a versatile 4-channel isolated relay output plug-in module for the Allen-Bradley Micro800 series. This module provides the ultimate flexibility for switching mixed-voltage AC and DC loads, while providing the critical electrical isolation needed for high-reliability industrial automation.
What Is the 2080-OW4I?
The 2080-OW4I is a discrete relay output module designed to fit into the plug-in slots of Micro820, Micro830, Micro850, and Micro870 controllers. The «I» in the part number stands for «Isolated,» which is the module’s most significant feature. Unlike standard relay modules where channels may share a common return, each of the four relay channels in the 2080-OW4I is individually isolated from the others and from the PLC logic. This allows a single plug-in module to control four different loads operating on four different voltages or phases. It is the ideal solution for interfacing a Micro800 PLC with legacy systems, switching 120V AC contactors alongside 24V DC solenoids. The electromechanical Form A (normally open) relays are rated for up to 2A, providing a robust interface that is immune to the leakage current issues found in solid-state output modules.
Key Technical Specifications
- Outputs: 4 individually isolated Form A (Normally Open)
- Isolation: Channel-to-channel and Channel-to-bus
- Contact Rating: 2A @ 120/240V AC and 24V DC
- Minimum Load: 10mA @ 5V DC
- Relay Response Time: 10ms (maximum)
- Mechanical Life: 20 million cycles (no load)
- Power Consumption: 3.3V (10mA), 24V (50mA)
- Standard Compliance: UL, CSA, CE
Architecture and Industrial Safety
The architecture of the 2080-OW4I is engineered to prevent electrical transients from entering the PLC processor. By providing 1500V AC isolation between channels, it eliminates the risk of ground loops and phase-to-phase short circuits across the module. This makes the 2080-OW4I a preferred choice for building automation, HVAC control, and water treatment skids where diverse equipment must be synchronized. The plug-in format ensures that this level of isolation and switching power is delivered without occupying any extra DIN rail space, allowing for extremely dense control cabinet layouts.
Expert Tips
When switching inductive AC loads with the 2080-OW4I, we highly recommend installing an external RC snubber circuit across the contacts. For DC inductive loads, use a flyback diode. This practice minimizes electrical arcing at the relay contacts, significantly extending the mechanical life of the module and reducing high-frequency noise that can interfere with nearby analog instrumentation. Also, ensure that the total module current does not exceed the controller’s internal power supply capacity, especially if you have multiple 2080-OW4I modules installed in a single Micro850 rack.
Frequently Asked Questions
Q: Can the 2080-OW4I be used with a Micro810?
A: No, the 2080-OW4I is a plug-in module that requires a standard plug-in slot found on Micro820 and larger controllers. The Micro810 uses a different, smaller accessory format.
Q: Is there any leakage current with these relay outputs?
A: No. Because these are mechanical dry contacts, they have zero leakage current in the «Off» state, making them perfect for switching very low-wattage LED indicators that might stay dimly lit on a transistor module.
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