Product Overview
When a CompactLogix or MicroLogix 1500 panel needs to drive real-world loads — contactors, solenoids, lamps, alarms — the 1769-OW8 delivers eight electromechanical relay outputs that switch both AC and DC circuits. As part of the Allen-Bradley Bulletin 1769 Compact I/O family, this module locks directly onto the controller’s expansion bus and shares power and data through the integrated bus connector.
Its wide 5-265V AC and 5-125V DC output range means one module covers mixed-voltage panels, reducing spare-part count. That flexibility is why the 1769-OW8 remains a practical choice for oil, gas, and industrial automation builds.
Technical Specifications
| Specification | Value |
|---|---|
| Outputs | 8 relay outputs |
| Output voltage range | 5-265V AC, 5-125V DC |
| Current per point (AC) | 2A/pt |
| Backplane current | 125 mA @ 5V, 100 mA @ 24V |
| Isolation | 1836V AC / 2596V DC |
| On/off response | 10 ms |
| Mounting | DIN rail or panel |
| Operating temperature | 0 to 60 C |
The 1836V AC / 2596V DC isolation rating keeps field wiring electrically separated from the control side, protecting the controller from transients on switched loads. The 10 ms on/off response suits general-purpose discrete control rather than high-speed pulse duties. Each point carries 2A at AC, enough for most pilot devices and small contactors.
Where the 1769-OW8 Fits
Pump and valve control. In upstream oil and gas skids, the module energizes solenoid valves and motor starters across mixed AC/DC circuits while isolation guards the controller from inductive kickback.
Alarm and annunciator panels. Eight independent relay contacts drive lamps, horns, and alarm beacons — a common need in gas compression and process monitoring rooms.
Legacy CompactLogix upgrades. Panels running older 1769 I/O can add or replace output capacity without changing the controller platform, since the module plugs onto the existing right-side expansion bus.
Installation Notes
The 1769-OW8 mounts on a panel with two screws or snaps onto DIN rail, then locks to adjacent modules via tongue-and-groove. It draws 5V and 24V DC from the system power supply through the bus; plan for up to eight I/O modules per side of the supply. Field wiring lands on a removable terminal block, which simplifies module swap-outs during maintenance. Confirm your controller’s expansion-bus capacity and power budget before adding modules.
Compatibility and Integration
This module works within the 1769 Compact I/O system for CompactLogix and MicroLogix 1500 controllers. For 1768 controllers, I/O mounts on the left-side 1768 backplane, and network connectivity comes from add-on modules such as 1768-ENBT (EtherNet/IP) or 1768-CNB (ControlNet); the 1768 platform also includes built-in RS-232. When wiring into such networks, an external gateway or connection module may be required — confirm cables and gateways with your supplier before ordering.
Selection Checklist
Before purchasing, verify your controller platform, required output count, and the AC/DC voltage of each load. Check that your power supply can carry the module’s 125 mA @ 5V and 100 mA @ 24V draw. The 1769-OW8 is an Active Mature product with an engineering replacement available; please verify current lifecycle status and availability with Oil AutoTech before ordering. Contact Oil AutoTech today for pricing and availability — spares when you need them, fast dispatch, worldwide.
