Overview
The Allen-Bradley 1746-NI16I is a high-density analog current input module for SLC 500 control systems. This 16-channel module provides backplane-isolated analog inputs configured for current-based process signals. With 16-bit resolution and multi-class support (Class 1 or Class 3), it delivers accurate, noise-immune signal acquisition for process monitoring and closed-loop control applications.
Key Features
- 16 isolated analog input channels for current signals
- Supports 0–20 mA, 4–20 mA, and ±20 mA input ranges
- 16-bit resolution for high-accuracy signal conversion
- Multi-class operation: Class 1 (8 input/8 output words) or Class 3 (32 input/32 output words)
- Factory calibrated and ready for use
- Built-in open-circuit detection for sensor fault reporting
- Backplane isolation reduces noise and enhances reliability
- Removable terminal blocks for quick module replacement
Technical Specifications
- Input Channels: 16
- Signal Type: Current (0–20 mA, 4–20 mA, ±20 mA, 0–1 mA)
- Resolution: 16-bit
- Backplane Current (5V): 125 mA
- Backplane Current (24V): 75 mA
- Bandwidth: 6–250 Hz
- Module Class: Multi-class (Class 1 or Class 3)
- Mounting: DIN-rail or 1746 chassis
Typical Applications
- Process monitoring and feedback in closed-loop control systems
- Industrial temperature, pressure, flow, and level measurement
- High-density data acquisition in manufacturing and utilities
- Legacy SLC 500 system upgrades and replacements
Compatibility & Replacements
Compatible With
- SLC 5/00, SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, SLC 5/05 processors
- SLC 500 modular chassis with 1746-series backplane
- Remote I/O via 1747-ASB adapter (Class 1 mode)
- ControlNet remote chassis via 1747-ACN(R) adapter
Replaces / Drop-In Replacement For
- 1746-NI16I Series A (original revision)
- Other 16-channel SLC 500 current input modules in Bulletin 1746 family
Works With
- RSLogix 500 (offline and online configuration)
- Allen-Bradley SLC 500 programming software
- EtherNet/IP networks via gateway modules
