Allen‑Bradley 1746-NI16I SLC 500 16-Channel Analog Input Module

The Allen‑Bradley 1746-NI16I is a 16-channel analog input module developed for the Rockwell SLC 500 PLC system. It receives analog current signals from field transmitters and converts them into digital data for the SLC processor to monitor process parameters such as pressure, temperature and flow.

This module supports standard 4–20mA signal input and provides channel-level diagnostics. It adopts compact single-slot design, widely supplied as spare replacement parts for upgrading and maintenance of SLC500 automation systems in machinery, water treatment and chemical industries.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation)
• Model: 1746-NI16I
• Product Type: SLC 500 16-Channel Analog Input Module
• Compatible Platform: SLC 500 PLC chassis system
• 16 channels of 4–20mA analog current input
• Built-in channel diagnostics for open circuit and signal failure detection
• LED indicators for module status and fault alarm information
• Operating Temperature Range: 0°C ~ +60°C
• Single slot installation on SLC500 rack backplane
• Isolated circuit design improves anti-interference performance

Core Functions

• Collect 4-20mA analog signals from various field process transmitters
• Convert analog field signals into digital data for SLC500 PLC processor processing
• Detect wire break faults and abnormal signals of each measuring channel automatically
• Front panel LED lights help maintenance staff quickly locate module and channel faults
• Realize continuous parameter monitoring for production process closed-loop control
• Communicate acquired data to PLC CPU through rack backplane bus
• Compact single-slot design saves cabinet space and facilitates system expansion
• Plug-in structure supports convenient disassembly and rapid on-site replacement
• Isolation protection prevents field interference from affecting the main control system
• Support multi-point analog data collection for medium and small automation projects

Application Scenarios

• Municipal water supply and sewage treatment plant process control systems
• Food, beverage and pharmaceutical production line monitoring control racks
• Petrochemical small unit flow, pressure parameter monitoring cabinets
• Building heating, ventilation and air conditioning (HVAC) automation platforms
• Material processing, packaging machinery production control equipment
• Power plant auxiliary equipment data acquisition and monitoring systems
• Rubber and plastic manufacturing production line parameter control units
• Pump station and pipeline valve group automatic monitoring control cabinets
• Retrofit, maintenance and spare parts replacement of existing SLC500 control systems
• Rockwell analog input module spare parts inventory and field emergency replacement projects