Product Overview
The Allen-Bradley 1746-IA4 is a SLC 500 Digital AC Input Module designed for general-purpose industrial applications. This 4-input module accepts 85-132 Volts AC and draws only 35 milliamps from the 5V DC backplane. As a compact single-slot module, the 1746-IA4 delivers reliable signal detection for discrete AC inputs in control systems.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1746-IA4 |
| Series |
SLC 500 |
| Module Type |
Digital AC Input Module |
| Voltage Range |
85-132 Volts AC |
| Inputs |
4 |
| Backplane Current (5 Volts DC) |
35 milliamps |
| Signal Delay |
35 or 45 milliseconds |
| Off State Current |
2 milliamps |
| Slots |
1 |
| I/O Connection |
1746-HT and 1746-HCA |
| Step Response |
100 milliseconds in, 2.5 milliseconds out |
Additional performance details include an operational frequency of 47-63 Hz, maximum OFF state input voltage of 30V AC, and nominal input current of 12 mA at 129V AC. The module measures 5" x 2" x 6" (13 cm x 5 cm x 15 cm) and weighs 0.17 kg. Thermal dissipation ranges from 0.175 watts minimum to 1.3 watts maximum, with 0.27 watts per point. Operating temperature is 32-140 degrees Fahrenheit.
Applications
With its robust AC input handling, the 1746-IA4 suits various industrial environments. Use it in machine control panels to monitor limit switches, push buttons, and other AC-powered devices. In material handling systems, this module reliably detects presence sensors and conveyor status signals. For retrofit projects upgrading older SLC 500 systems, the 1746-IA4 provides a drop-in replacement that maintains compatibility with existing I/O wiring.
Installation & Setup
Install the 1746-IA4 in any single slot of an SLC 500 chassis. Ensure the backplane connector aligns properly and secure the module with the locking mechanism. Wire AC inputs to the terminal block using the 1746-HT or 1746-HCA cables. Verify that the input voltage stays within 85-132V AC before powering the system. Configure the input points in your SLC 500 program to match the module's address.
Maintenance & Reliability
Routine inspection of the 1746-IA4 helps maintain long-term reliability. Check for loose wiring connections and signs of overheating. Keep the module free from dust and moisture, as these can affect performance. The module's solid-state design minimizes wear, but periodic testing of input channels ensures early detection of any faults.
Compatibility & Integration
The 1746-IA4 integrates seamlessly with the SLC 500 family of controllers. It occupies one slot and communicates over the backplane, requiring no additional power supply. Use the specified I/O cables (1746-HT and 1746-HCA) to connect field wiring. This module is compatible with all SLC 500 CPUs, making it a versatile choice for system expansion or replacement.
Selection Guide
Before purchasing, verify your system's input voltage and number of inputs. The 1746-IA4 handles 4 AC inputs within 85-132V AC, suitable for 120V AC applications. Confirm that your chassis has an available slot. For guaranteed quality and availability, choose PLC Source PRO as your supplier for this genuine Allen-Bradley 1746-IA4 module.