Overview
The Allen-Bradley 1746-NI16I is a high-density analog current input module built for SLC 500 programmable logic controllers. This multi-class module delivers 16 individually isolated backplane-isolated input channels with 16-bit resolution, making it suitable for demanding closed-loop control and monitoring applications requiring accurate current signal acquisition.
Key Features
- 16 configurable analog input channels with backplane isolation
- 16-bit resolution for high-precision process variable measurement
- Supports 0-20 mA, 4-20 mA, ±20 mA, and 0-1 mA current ranges
- Multi-class operation: Class 1 (8 input/output words) or Class 3 (32 input/output words)
- Open-circuit detection for fault diagnostics
- Compact single-slot module design for standard SLC 500 chassis mounting
- Bandwidth: 6-250 Hz for smooth signal processing
Technical Specifications
- Input Channels: 16 isolated current inputs
- Resolution: 16-bit
- Current Range Options: 0-20 mA, 4-20 mA, ±20 mA, 0-1 mA
- Backplane Current Draw: 125 mA at 5V DC; 75 mA at 24V DC
- Bandwidth: 6-250 Hz
- Module Type: Single-slot, multi-class (Class 1 or Class 3)
- I/O Words: Class 1: 8 input words, 8 output words; Class 3: 32 input words, 32 output words
- Mounting: SLC 500 chassis-mounted with terminal block interface
- Controller Compatibility: SLC 5/01 (Class 1 only), SLC 5/02, 5/03, 5/04, 5/05
Typical Applications
- Process control monitoring (temperature, pressure, flow, level sensors)
- Closed-loop feedback systems in industrial automation
- 4-20 mA transmitter acquisition for HVAC and facility management
- Analog signal integration in machine control systems
- Multi-parameter industrial process data acquisition
Compatibility & Replacements
Compatible With
- SLC 500 Programmable Logic Controllers
- SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, SLC 5/05 processors
- Standard SLC 500 I/O chassis and backplane
- RSLogix 500 programming software (version 1.30 or later for Class 3 support)
- SLC 500 A.I. Series Programming Software
Replaces / Drop-In Replacement For
- 1746-NI16I Series A modules in existing systems
- Legacy analog current input modules in SLC 500 configurations requiring 16-point current acquisition
Works With
- RSLogix 500 offline and online configuration
- SLC 500 A.I. Series programming environment
- Standard industrial current transmitters and sensors (4-20 mA standard loop powered devices)
- Shielded twisted-pair analog cabling per SLC 500 installation guidelines
- Remote I/O chassis with 1747-ASB adapter (Class 1 mode only)
