Overview
The Allen-Bradley 1746-NI16I is a high-density analog input module designed for SLC 500 modular and fixed controllers. This single-slot module offers 16 configurable input channels with 16-bit resolution, providing precision analog signal acquisition for process control, monitoring, and closed-loop feedback applications. Each channel can be independently configured for voltage or current input, making it flexible for diverse sensor and transducer types. The module features Sigma-Delta analog-to-digital conversion, automatic I/O updates, and integrated status LEDs for real-time diagnostics.
Key Features
- 16 Single-Ended Input Channels: High-impedance input channels arranged in 4 isolated groups of 4 inputs with shared common terminals
- User-Selectable Input Configuration: Each channel configurable for ±10V DC, 1–5V DC, 0–10V DC, 0–50V DC, 0–20 mA, 4–20 mA, ±20 mA, or 0–1 mA
- 16-Bit Resolution: Sigma Delta A/D conversion method for high-precision signal digitization
- Multi-Class Operation: Single-slot module supporting Class 1 (8 input words, 8 output words) or Class 3 (32 input words, 32 output words) configurations
- Status Monitoring: 5 LEDs display module and individual input group status
- Removable Terminal Block (RTB): Quick-disconnect wiring for field replacement and maintenance
Technical Specifications
- Input Channels: 16 single-ended, isolated in 4 groups
- Input Signal Range: ±10V DC, 1–5V DC, 0–50V DC, 0–10V DC, 0–20 mA, 4–20 mA, ±20 mA, or 0–1 mA
- Resolution: 16-bit digital output
- A/D Conversion Method: Sigma-Delta
- Common Mode Voltage Range: ±10.25V from analog common terminal (±20.5V maximum)
- Backplane Power: +5V DC (125 mA maximum) or 75 mA at 24V DC
- Isolation Voltage: 500V AC and 710V DC tested for 60 seconds
- Data Formats Supported: Engineering Units, Scaled-for-PID, Proportional Counts, 1746-NI4 Data Format
- Module Configuration: ID code 10403 (Class 1) / 12726 (Class 3); RSLogix 500 version 1.30 or later supports Class 3
- Mounting: Single-slot 1746 chassis (any slot except slot 0)
Typical Applications
The 1746-NI16I excels in precision process control environments where analog signal acquisition is mission-critical:
- Process Control: Temperature, pressure, flow rate, and level monitoring in industrial processes
- Closed-Loop Feedback Systems: Proportional-integral-derivative (PID) control of motors, valves, and drives
- Data Logging & Monitoring: Real-time acquisition from transducers and sensors across multiple channels
- Legacy System Upgrades: Direct replacement in existing SLC 500 systems requiring higher channel density than 1746-NI4
- Multi-Sensor Integration: Mixed voltage/current sensor environments with unified data handling
Compatibility & Replacements
Compatible With
- SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 processors; Fixed SLC 500; Remote I/O chassis with 1747-ASB; ControlNet chassis with 1747-ACN(R)
- 1746 modular chassis (7-slot and 4-slot configurations)
- 1746-A4, 1746-A13 expansion racks
Replaces / Drop-In Replacement For
- 1746-NI4 (4-channel modules can be upgraded to 1746-NI8 or 1746-NI16 for higher density)
- Previous series 1746-NI16I revisions (backward compatible)
Works With
- Programming Software: RSLogix 500 version 1.30 or later; SLC 500 A.I. Series Programming Software; Advanced Programming Software (APS)
- Communication Networks: Parallel backplane interface (local and remote I/O)
- Data Format Compatibility: Transmits as Engineering Units, Scaled-for-PID, Proportional Counts, or 1746-NI4 Data Format
- Wiring Standards: Use shielded communication cable (Belden 8761); follow SLC 500 Modular Hardware Installation Manual (publication 1747-6.2)
