Overview
The Opto 22 PB4 is a 4-channel I/O mounting rack that serves as the foundation for building flexible digital I/O systems in industrial control applications. Designed for Opto 22 standard (G1) single-channel input and output modules, the PB4 accommodates a mix of digital I/O functions in a compact 4.5″ × 3.5″ footprint. The rack features two barrier strips—one on the field side and one on the logic side—providing galvanic isolation between field wiring and controller connections.
Key Features
- 4-Channel Capacity: Holds up to four Opto 22 G1 digital I/O modules in any combination of inputs or outputs
- Dual Barrier Strips: Separate screw terminals on field and logic sides for clean electrical separation and safety
- Multi-Voltage Support: Compatible with 5V, 15V, and 24V module types for flexible system integration
- Protected Module Positions: Each channel position includes a 5A replaceable fuse and individual status LED for diagnostics
- Compact Design: 4.5″ L × 3.5″ W form factor fits standard panel mounting and control enclosures
Technical Specifications
- Module Positions: 4 channels
- Pin Configuration: 18-pin connector
- Compatible Module Voltage Levels: 5V DC, 15V DC, 24V DC
- Fuse Rating per Channel: 5A replaceable
- Mounting Type: Screw terminal
- Dimensions: 4.5″ L × 3.5″ W
- Accessory Type: Module rack / I/O mounting rack
- Series: PB Series (Standard/Classic Digital)
- Generation: G1 (Generation 1)
- Status Indication: LED per channel
Typical Applications
- Machine control and automation systems requiring isolated field and logic terminals
- Manufacturing process control with mixed digital input/output requirements
- Industrial equipment retrofit installations using legacy Opto 22 modules
- Panel-mount I/O systems where compact size and modular expandability are critical
- Applications requiring individual channel fusing and status indication
Compatibility & Replacements
Compatible With
- Opto 22 G1 (Generation 1) standard digital I/O modules (both input and output types)
- 5V DC, 15V DC, and 24V DC module variants
- Opto 22 solid-state relay (SSR) modules in G1 form factor
- Standard industrial control systems with 18-pin module rack interfaces
Replaces / Drop-In Replacement For
- The Opto 22 PB4 is a legacy product; verify compatibility with your system integrator before ordering as replacements in newer Opto 22 product lines (G4 series) may require different mounting hardware or module interfaces.
Works With
- Opto 22 SNAP PAC controllers and legacy PAC systems
- Opto 22 G1 family I/O modules and solid-state relays
- Standard panel mount and DIN-rail mounting enclosures
- Industrial PLCs and control systems accepting G1-format I/O racks
