Overview
The Allen-Bradley 1746-IV16 is a current sourcing discrete input module for the SLC 500 PLC platform. This module provides 16 input channels configured in a single group of 16 points, accepting 24V DC signals from field devices such as sensors, switches, and auxiliary contacts. The module is designed for applications requiring reliable binary or ON/OFF signal acquisition in industrial automation systems.
Key Features
- 16 Sourcing Input Channels: Accepts nominal input voltage of 24VDC with operating voltage range of 10-30VDC
- Removable Terminal Blocks: Eliminates the need to disconnect any of the wires and makes module replacement easy
- Noise Immunity: Includes filter circuitry and optical coupling for signal noise reduction
- LED Status Indicators: Front-panel LEDs provide real-time input status visibility for troubleshooting
- Ladder Logic Compatible: Input values can be easily accessed by SLC 500 processors that use Ladder Logic programming
Technical Specifications
The module has Sixteen (16) channels that accepts a nominal input voltage of 24VDC with operating voltage range of 10-30VDC. It has a nominal input current of 8 mA at 24 Volts DC and a maximum power dissipation of 3.6 Watts. It has One (1) group of 16 channels with backplane current draw of 0.085 A. The 1746-IV16 has a signal delay of 0.5 ms during off-state and 0.3 ms during on-state. The 1746-IV16 is intended for use in an environment with a 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) temperature range and a 5 to 95% noncondensing relative humidity range.
Typical Applications
This module is commonly used to detect the on/off status of sensors, switches, and other discrete devices in industrial automation applications. The module features Sixteen (16) sourcing input channels, ideally used for interfacing electrical signaling devices such as switches, auxiliary contacts, sensors and other devices that provide binary or ON/ OFF signal states. The sourcing configuration allows the module to supply signal voltage to field devices that cannot provide their own, making it ideal for applications with passive contacts or low-voltage transmitters.
Compatibility & Replacements
The 1746-IV16 /C is fully compatible with all SLC 500 processors and can be installed in any available slot within the 1746 I/O chassis. It works in tandem with other SLC 500 modules including output modules (1746-OB8, 1746-OB16, etc.) to create complete distributed I/O solutions. When upgrading or maintaining legacy SLC 500 systems, the 1746-IV16 is a proven direct replacement. This Series C revision represents later-generation hardware with standard compatibility across all SLC 500 processor generations.
