Purchase now: Allen-Bradley 1762-OB8 MicroLogix Expansion Output Module
Atlantechdrives provides you the 1762-OB8, a reliable 8-point discrete DC sourcing output module for the MicroLogix 1100, 1200, and 1400 expansion bus. This module is the perfect entry-level expansion for small machines and panels where only a few additional 24V DC control points are needed, providing a cost-effective way to scale your control system without unnecessary complexity.
- Outputs: 8 Digital DC Sourcing Outputs
- Operating Voltage: 20.4V to 26.4V DC
- Current Rating: 0.5A per point @ 55°C
- On-State Voltage: 24V DC (nominal)
- Bus Draw: 115 mA @ 5V DC
Technical Performance: Reliable Low-Density Control
The 1762-OB8 is engineered to provide the same industrial durability as higher-density modules but in an 8-point format. It features high-quality solid-state switching components that offer a much longer service life than mechanical relays for high-frequency applications. The sourcing logic ensures that the module provides the «hot» side of the circuit to your load, simplifying troubleshooting and enhancing safety. Its 8 outputs are software-configurable and feature integrated opto-isolation to protect the PLC backplane from electromagnetic noise. The 1762-OB8’s relatively low power consumption makes it an ideal choice for systems already operating near the limit of the MicroLogix internal power supply capacity, allowing for expansion where larger modules might trigger a power fault.
Installation Advice: Wiring and Commoning
When wiring the 1762-OB8, use 18-22 AWG copper wire and ensure a clean strip length for the terminal screws. Because the module is non-isolated between channels (they share a common point), you must ensure that all loads in the group are powered from the same 24V DC source. We recommend using a dedicated, filtered DC power supply for the I/O to avoid noise from VFDs or large motors. If you are mounting the 1762-OB8 in a high-vibration environment, use the DIN-rail locking mechanism and ensure the ribbon cable is secure. A «tug test» on the field wiring is recommended to prevent intermittent contact due to machine vibration.
Maintenance and Long-Term Reliability
The 1762-OB8 requires minimal maintenance. Annual checks of the screw terminal tightness and a visual inspection of the 8 status LEDs are usually sufficient. If an output channel stops responding, check the field device first; if the load is functional but the 1762-OB8 LED is dark, use RSLogix 500 to confirm if the output is being commanded in the logic. By choosing original 1762-OB8 parts from Atlantechdrives, you are opting for a component with a proven track record in thousands of industrial applications, ensuring your small automation projects stay online for years.
FAQs
Q: Can the 1762-OB8 handle negative logic (Sinking)?
A: No, the 1762-OB8 is a Sourcing-only module. For Sinking outputs, you would need an OV-series module.
Q: What happens if an output is short-circuited?
A: The module does not have per-point electronic fusing; an external fuse is recommended for each point to prevent hardware damage from field-side shorts.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This compact 8-point DC output module is an efficient way to add control points to a 1762-L24BXB MicroLogix node.
