Overview
The Allen-Bradley 1746-IA16 is a digital AC input module purpose-built for SLC 500 programmable logic controllers. This module provides real-time interface from 16 discrete AC input channels to the SLC 500 processor, enabling reliable monitoring of field device states during the input scan phase. The removable terminal block design eliminates rewiring during replacement, streamlining maintenance and commissioning.
Key Features
- 16 AC input channels for discrete signal monitoring
- Operating voltage range 85–132V AC at 47–63 Hz
- Removable terminal block with 20 terminals (2 internally connected commons)
- Low signal delay: 35 ms ON, 45 ms OFF maximum
- Single-slot chassis mount for fixed or modular SLC 500 configurations
- Backplane current draw: 85 mA @ 5V DC
Technical Specifications
The 1746-IA16 is designed for general-purpose AC input applications in industrial control systems. Its robust input circuit handles standard SLC 500 inrush current levels without internal protection, making external surge protection advisable for critical applications. Signal delay characteristics ensure consistent response in safety-related and time-sensitive logic.
Typical Applications
- Material handling and conveyor control
- HVAC system monitoring and interlocks
- High-speed assembly operations
- Small process control and batch operations
- Simple motion control sequencing
- SCADA front-end input acquisition
Compatibility & Replacements
Compatible With
- Allen-Bradley SLC 500 fixed controllers (1747 series)
- Allen-Bradley SLC 500 modular controllers (1756 series)
- SLC 500 expansion racks and remote I/O installations
- RSLogix 500 programming software
- EtherNet/IP communication via SLC 500 bridge modules
Replaces / Drop-In Replacement For
- Allen-Bradley 1746-IA16 Series A, B, and earlier revisions
Works With
- RSLogix 500 (project configuration and tag-based I/O mapping)
- SLC 500 network modules (1746-NT4, 1746-N2)
- Other 1746 series I/O modules in the same chassis
- Standard AC field devices and sensors (100–120VAC rated)
