Allen-Bradley 1769-OB32 CompactLogix Compact I/O Solid-State DC Output Module

The 1769-OB32 is a high-density 32-point discrete solid-state electronic module designed to provide sourcing direct-current switching capabilities within the CompactLogix / Compact I/O hardware infrastructure. It converts electronic control logic commands from a central processor into discrete 24 VDC output paths divided into two separate, isolated groups of 16 channels each. This hardware allows low-power programmatic actuation of direct-current devices including industrial control relays, indicators, display panels, and small solenoid valves. The assembly interfaces natively with CompactLogix automation systems or functions as distributed field hardware through a MicroLogix controller expansion link or network adapter module. System interlocking is maintained through an optoelectronic safety barrier providing a continuous 30 VDC working isolation voltage profile to protect internal system backplane components against plant field line anomalies.

Features

• High-Density Channel Array: Packs 32 discrete solid-state source-type outputs inside a single-slot module footprint to save panel space.
• Dual Group Isolation: Separates channels into two distinct electrical banks of 16 outputs, permitting independent field power supply routing.
• Electronic Short-Circuit Protection: Incorporates an integrated electronic protection matrix that auto-detects thermal/current faults to minimize down-time.
• Module Slot Keying: Features integrated mechanical tongue-and-groove guide rails to prevent incorrect alignment during installation.
• Front Diagnostic LED Panel: Provides 32 separate green indicators to deliver real-time channel state visualization for point-level testing.
• Removable Terminal Block: Employs a 40-pin finger-safe terminal block with a latching door mechanism to enable hot-swapping sequences without wire removal.

Applications

• Driving localized low-power direct current pneumatic solenoid manifolds.
• Interfacing control logic to discrete input channels of motor speed controllers.
• Main operator desk visual illumination lamps and pilot sounders.
• Actuating discrete interface auxiliary relays in process manufacturing lines.

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Bus Connection Latching: Align the side tongue-and-groove tracks precisely before mating the expansion connector. Slide the integrated mechanical bus lever completely to the left position to lock the backplane connectors firmly into place.
• Power Supply Proximity Matching: Do not exceed the strict 8-slot distance limitation boundary when placing the hardware module relative to the nearest system power supply block.
• Terminal Wiring Entry Limits: Connect only copper wire configurations rated for 75 degC minimum. Single wire gauges must fall inside the 0.32 to 0.82 mm2 (22 to 18 AWG) window with insulation stripping adjusted to 11 mm.
• Grounding Connection Practices: Ground the hosting DIN rail or backplane framework back to an earth anchor point using heavy gauge wire to mitigate transient radio-frequency or electromagnetic fields.

Detailed Installation Reference

For comprehensive step-by-step physical mounting, wiring arm configurations, and detailed channel layout diagrams, please refer to the official installation publication:

👉 Click Here to Download the Full Allen-Bradley 1769-OB32 Installation Manual

FAQ

Q: Does this specific model function as a sourcing type or a sinking type output card?

A: This module functions exclusively as a sourcing type device, meaning it switches the positive voltage potential (+VDC) from the supply line out to the field load terminal.

Q: Can Group 1 and Group 2 be powered by completely separate power supplies?

A: Yes, because Group 1 and Group 2 are completely isolated from each other, you can use two distinct 24V DC power sources landed on their respective VDC and COM terminals.

Q: What is the maximum current load allowed on a single channel point when operating at full 60 Celsius temperature specs?

A: When running at an ambient temperature of 60 Celsius, the maximum continuous output current limit is 0.5 A per individual channel point.