Overview
The Allen-Bradley 1791-OB32 B is a Series B compact I/O output module designed for discrete 24VDC control in Allen-Bradley CompactLogix and MicroLogix automation systems. With 32 individually controlled output points, this module provides cost-effective distributed I/O expansion for machine control, process automation, and industrial field-mounted applications.
Key Features
- 32 discrete 24VDC output points, configurable per group
- Compact block-style form factor for space-constrained enclosures
- Integrated sourcing outputs for direct control of solenoids, relays, and indicator lights
- Low power consumption ideal for cabinet and field-mounted installations
- Series B proven reliability in industrial environments
Technical Specifications
- Module Type: Digital DC Output Block
- Output Points: 32 (24VDC)
- Supply Voltage: 19.2–30VDC
- Supply Current: 300mA nominal
- Output Voltage Range: 10–30VDC
- Output Current Rating: 500mA per point
- Series: B
- Condition: Used, tested
- Form Factor: Block I/O module
Typical Applications
- Solenoid valve control (pneumatic/hydraulic systems)
- Motor starter relay outputs
- Status light and indicator control
- Discrete equipment shutdown signals
- Distributed I/O expansion in compact panels
- Equipment control in machine tool and process automation
Compatibility & Replacements
Compatible With
- Allen-Bradley CompactLogix systems (1768 controllers)
- Allen-Bradley MicroLogix systems (1100, 1400 series)
- Remote I/O terminals via hardwired or networked configurations
- 24VDC field devices (solenoids, relays, motors, indicators)
- RSLogix 500 and Studio 5000 Compact firmware
Replaces / Drop-In Replacement For
- 1791-OB32 Series A (with firmware/configuration verification)
- Equivalent third-party 32-point 24VDC output modules in CompactLogix-compatible systems
Works With
- RSLogix 500 and Studio 5000 Compact (CompactLogix programming)
- Studio 5000 Logix Designer (firmware/hardware compatibility required)
- 24VDC field power supplies (2–5A recommended for full module operation)
- Standard industrial wiring terminals and protective fusing (external protection recommended)
