Overview
The Allen-Bradley 1734-IB8 is a POINT I/O digital DC sinking input module engineered for modular, distributed I/O architecture. This eight-channel input module processes 24V DC signals in sink configuration and integrates seamlessly with FlexLogix and CompactLogix controllers via POINT I/O terminal bases. The DIN-mounted, open-style design supports rapid wiring through removable terminal blocks, making it ideal for panel-mounted and cabinet installations across industrial automation and motion control applications.
Key Features
- Eight Sinking Inputs: Processes 8 discrete 24V DC signal channels in sink wiring configuration
- Wide Input Range: Operates nominally at 24V DC with acceptance of 10–28.8V DC for supply flexibility
- DIN Rail Mounting: Compact footprint mounts on standard DIN rail with removable terminal bases (1734-TB, 1734-TBS compatible)
- Low Power Dissipation: Maximum 1.6 watts at 28.8V DC, reducing thermal load in control cabinets
- Fast Response: 0.5 millisecond input response time for time-critical signal monitoring
- POINT I/O Ecosystem: Fully compatible with POINT I/O adapters, controllers, and peripherals for scalable distributed I/O
Technical Specifications
- Input Type: Digital DC, Sinking (source-to-module)
- Number of Inputs: 8 channels
- Nominal Input Voltage: 24V DC
- Input Voltage Range: 10–28.8V DC
- On-State Current (Nominal): 4 mA
- On-State Current Range: 2–5 mA
- Off-State Voltage (Maximum): 5V DC
- Off-State Current (Minimum): 1.5 mA
- POINTBus Current (Maximum): 75 mA @ 5V DC
- Power Dissipation (Maximum): 1.6 watts @ 28.8V DC
- Isolation Voltage (Continuous): 50V
- Input Response Time: 0.5 milliseconds
- Mounting: DIN Rail (open-style enclosure)
- Terminal Base Compatibility: 1734-TB, 1734-TBS
- Operating Temperature: Up to 131°F (55°C typical)
- Standards: UL, CE, CUL, CCC, C-TICK, KC
Typical Applications
The 1734-IB8 is widely deployed in discrete manufacturing, packaging machinery, process automation, and motor control applications. Common uses include monitoring limit switches, proximity sensors, photoelectric sensors, push buttons, and interlock devices. The distributed I/O architecture suits complex machine layouts where centralizing all inputs at a single PLC rack would require excessive wiring and conduit, reducing system cost and installation time.
Compatibility & Replacements
The Allen-Bradley 1734-IB8 is part of the POINT I/O modular I/O family and works with POINT I/O adapters designed for CompactLogix, FlexLogix, and Micro800 controllers. It accepts terminal base units 1734-TB and 1734-TBS for flexible wiring. For safety-critical applications requiring certified fault tolerance, the 1734-IB8S safety-rated variant is available. The standard 1734-IB8 is a direct drop-in replacement for worn or failed modules in existing POINT I/O systems and is commonly stocked as a spare part for field maintenance and system upgrade projects.
