The Allen-Bradley 1746-IA8 is a high-density digital input module designed for use within the SLC 500 programmable controller system. This module provides 8 input channels, specifically engineered to interface with 100/120V AC field devices. It serves as a critical component for monitoring AC-powered sensors, limit switches, and pushbuttons, converting field-level AC signals into logic-level signals compatible with the SLC 500 processor.
Features
8-channel digital input configuration.
Designed for 100/120V AC input voltage ranges.
Compatible with standard SLC 500 I/O chassis.
Optical isolation between field-side and logic-side circuitry to protect the controller from electrical noise and transients.
Status indicators for each channel to facilitate rapid troubleshooting and diagnostics.
Technical Specifications
Manufacturer
Allen-Bradley
Model
1746-IA8
Module Type
AC Input Module
Number of Inputs
8
Voltage Category
100/120V AC
Status
Discontinued (Manufacturer date: 2018-08-19)
Installation Guidelines
Ensure the SLC 500 chassis power is disconnected before installing or removing the module to prevent electrical shock or damage.
Align the module carefully with the chassis backplane connector and slide it into the desired slot until the locking tabs engage.
Use appropriate shielded cabling for input signals to minimize electromagnetic interference (EMI) in industrial environments.
Ensure all field wiring is properly terminated to the removable terminal block and that the terminal block is securely seated on the module.
Maintain adequate clearance around the module to ensure proper airflow and cooling within the control cabinet.
Follow standard ESD (Electrostatic Discharge) precautions when handling the module to protect internal components.
FAQ
Is the 1746-IA8 still supported by the manufacturer?
The 1746-IA8 was officially discontinued by Allen-Bradley on August 19, 2018. While it is no longer in active production, it remains widely available through secondary market channels for maintenance and legacy system support.
Can I use this module with any SLC 500 processor?
Yes, the 1746-IA8 is designed to be compatible with standard SLC 500 I/O chassis and can be used with any SLC 500 processor that supports the 1746 I/O platform, provided the system power supply has sufficient capacity for the module's current draw.
