Purchase now: Allen-Bradley 1762-OW8 MicroLogix Relay Expansion Module
Atlantechdrives provides you the 1762-OW8, a reliable 8-point digital relay output module for the MicroLogix 1100, 1200, and 1400 controllers. This module provides a simple and effective way to expand your PLC’s control over high-voltage or high-current field devices, offering the ruggedness of mechanical switching in a cost-effective 8-point format.
- Outputs: 8 Normally Open (N.O.) Relays
- Operating Voltage: 5-265V AC / 5-125V DC
- Current Rating: 2.5A per point @ 55°C
- Bus Current Draw: 80 mA @ 5V DC / 90 mA @ 24V DC
- Indicators: 8 Amber Status LEDs
Technical Performance: Versatile Power Switching
The 1762-OW8 is engineered for versatility in small machine control. Each of the 8 relay points acts as a dry contact, providing the electrical separation required to control field devices on different circuits. Whether you are switching 24V DC pilot lights or 240V AC small motors, the 1762-OW8 provides the current-handling capacity (up to 2.5A) to do it without external hardware. The module is designed with industrial-grade mechanical relays that offer excellent resistance to electrical noise and voltage transients. Its compact size and low power draw from the MicroLogix expansion bus make it an ideal choice for systems that are already operating near their power limit. The front panel features 8 independent LEDs, making field-side troubleshooting intuitive for maintenance personnel during machine commissioning or repair.
Installation Advice: Wiring for Mechanical Longevity
When wiring the 1762-OW8, ensure that the wire gauge is appropriate for the current being switched (14-22 AWG is recommended). To prevent vibration from loosening the connections over time, use ferrules on all stranded wires. For inductive loads, such as solenoids or relay coils, the use of external suppression (RC snubbers or diodes) is critical. Without suppression, the electrical arc generated during contact opening will carbonize the relay contacts, eventually leading to high resistance and failure. In the RSLogix 500 configuration, verify that the module is correctly identified in the I/O bank to avoid «Bus Error» faults during power-up.
Maintenance and Lifecycle Protection
The 1762-OW8 requires minimal maintenance beyond periodic visual inspections. Check the terminal screws for tightness every 6 to 12 months, especially in high-vibration environments like pump rooms or conveyor systems. If a specific relay point stops functioning, verify the field fuse first; if the fuse is intact but the relay doesn’t «click,» the module should be replaced. Sourcing an authentic 1762-OW8 from Atlantechdrives ensures that the internal relays meet the original cycle-life ratings, providing you with a dependable control solution that keeps your production moving without unexpected failures.
FAQs
Q: Does the 1762-OW8 require an external power supply?
A: It draws logic power from the expansion bus, but the voltage for the loads must be provided to the common terminals of the relays.
Q: What happens if the current exceeds 2.5A?
A: Overcurrent will lead to contact welding. For higher currents, use the 1762-OW8 to drive a larger external power relay.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This 8-point relay output module provides universal load switching; for higher density requirements, consider the 1762-OW16 expansion card.
